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FFmpeg/libavcodec/on2avc.c
Marton Balint 2eb7df1cbd avcodec/on2avc: use correct fft sizes 
Also rename the contexts and the functions so their names will reflect their
intended size.

With the earlier patch this fixes the audio corruption regression caused by
6ba0aa1770.

Fixes ticket #10029.

Signed-off-by: Marton Balint <cus@passwd.hu>
2023-08-08 18:33:21 +02:00

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/*
* On2 Audio for Video Codec decoder
*
* Copyright (c) 2013 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/channel_layout.h"
#include "libavutil/ffmath.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mem_internal.h"
#include "libavutil/tx.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.h"
#include "on2avcdata.h"
#define ON2AVC_SUBFRAME_SIZE 1024
enum WindowTypes {
WINDOW_TYPE_LONG = 0,
WINDOW_TYPE_LONG_STOP,
WINDOW_TYPE_LONG_START,
WINDOW_TYPE_8SHORT = 3,
WINDOW_TYPE_EXT4,
WINDOW_TYPE_EXT5,
WINDOW_TYPE_EXT6,
WINDOW_TYPE_EXT7,
};
typedef struct On2AVCContext {
AVCodecContext *avctx;
AVFloatDSPContext *fdsp;
AVTXContext *mdct, *mdct_half, *mdct_small;
AVTXContext *fft64, *fft128, *fft256, *fft512;
av_tx_fn mdct_fn, mdct_half_fn, mdct_small_fn;
av_tx_fn fft64_fn, fft128_fn, fft256_fn, fft512_fn;
void (*wtf)(struct On2AVCContext *ctx, float *out, float *in, int size);
int is_av500;
const On2AVCMode *modes;
int window_type, prev_window_type;
int num_windows, num_bands;
int bits_per_section;
const int *band_start;
int grouping[8];
int ms_present;
int ms_info[ON2AVC_MAX_BANDS];
int is_long;
uint8_t band_type[ON2AVC_MAX_BANDS];
uint8_t band_run_end[ON2AVC_MAX_BANDS];
int num_sections;
float band_scales[ON2AVC_MAX_BANDS];
VLC scale_diff;
VLC cb_vlc[16];
float scale_tab[128];
DECLARE_ALIGNED(32, float, coeffs)[2][ON2AVC_SUBFRAME_SIZE];
DECLARE_ALIGNED(32, float, delay) [2][ON2AVC_SUBFRAME_SIZE];
DECLARE_ALIGNED(32, float, temp) [ON2AVC_SUBFRAME_SIZE * 2];
DECLARE_ALIGNED(32, float, mdct_buf) [ON2AVC_SUBFRAME_SIZE];
DECLARE_ALIGNED(32, float, long_win) [ON2AVC_SUBFRAME_SIZE];
DECLARE_ALIGNED(32, float, short_win)[ON2AVC_SUBFRAME_SIZE / 8];
} On2AVCContext;
static void on2avc_read_ms_info(On2AVCContext *c, GetBitContext *gb)
{
int w, b, band_off = 0;
c->ms_present = get_bits1(gb);
if (!c->ms_present)
return;
for (w = 0; w < c->num_windows; w++) {
if (!c->grouping[w]) {
memcpy(c->ms_info + band_off,
c->ms_info + band_off - c->num_bands,
c->num_bands * sizeof(*c->ms_info));
band_off += c->num_bands;
continue;
}
for (b = 0; b < c->num_bands; b++)
c->ms_info[band_off++] = get_bits1(gb);
}
}
// do not see Table 17 in ISO/IEC 13818-7
static int on2avc_decode_band_types(On2AVCContext *c, GetBitContext *gb)
{
int bits_per_sect = c->is_long ? 5 : 3;
int esc_val = (1 << bits_per_sect) - 1;
int num_bands = c->num_bands * c->num_windows;
int band = 0, i, band_type, run_len, run;
while (band < num_bands) {
band_type = get_bits(gb, 4);
run_len = 1;
do {
run = get_bits(gb, bits_per_sect);
if (run > num_bands - band - run_len) {
av_log(c->avctx, AV_LOG_ERROR, "Invalid band type run\n");
return AVERROR_INVALIDDATA;
}
run_len += run;
} while (run == esc_val);
for (i = band; i < band + run_len; i++) {
c->band_type[i] = band_type;
c->band_run_end[i] = band + run_len;
}
band += run_len;
}
return 0;
}
// completely not like Table 18 in ISO/IEC 13818-7
// (no intensity stereo, different coding for the first coefficient)
static int on2avc_decode_band_scales(On2AVCContext *c, GetBitContext *gb)
{
int w, w2, b, scale, first = 1;
int band_off = 0;
for (w = 0; w < c->num_windows; w++) {
if (!c->grouping[w]) {
memcpy(c->band_scales + band_off,
c->band_scales + band_off - c->num_bands,
c->num_bands * sizeof(*c->band_scales));
band_off += c->num_bands;
continue;
}
for (b = 0; b < c->num_bands; b++) {
if (!c->band_type[band_off]) {
int all_zero = 1;
for (w2 = w + 1; w2 < c->num_windows; w2++) {
if (c->grouping[w2])
break;
if (c->band_type[w2 * c->num_bands + b]) {
all_zero = 0;
break;
}
}
if (all_zero) {
c->band_scales[band_off++] = 0;
continue;
}
}
if (first) {
scale = get_bits(gb, 7);
first = 0;
} else {
scale += get_vlc2(gb, c->scale_diff.table, 9, 3);
}
if (scale < 0 || scale > 127) {
av_log(c->avctx, AV_LOG_ERROR, "Invalid scale value %d\n",
scale);
return AVERROR_INVALIDDATA;
}
c->band_scales[band_off++] = c->scale_tab[scale];
}
}
return 0;
}
static inline float on2avc_scale(int v, float scale)
{
return v * sqrtf(abs(v)) * scale;
}
// spectral data is coded completely differently - there are no unsigned codebooks
static int on2avc_decode_quads(On2AVCContext *c, GetBitContext *gb, float *dst,
int dst_size, int type, float band_scale)
{
int i, j, val, val1;
for (i = 0; i < dst_size; i += 4) {
val = get_vlc2(gb, c->cb_vlc[type].table, 9, 2);
for (j = 0; j < 4; j++) {
val1 = sign_extend((val >> (12 - j * 4)) & 0xF, 4);
*dst++ = on2avc_scale(val1, band_scale);
}
}
return 0;
}
static inline int get_egolomb(GetBitContext *gb)
{
int v = 4;
while (get_bits1(gb)) {
v++;
if (v > 30) {
av_log(NULL, AV_LOG_WARNING, "Too large golomb code in get_egolomb.\n");
v = 30;
break;
}
}
return (1 << v) + get_bits_long(gb, v);
}
static int on2avc_decode_pairs(On2AVCContext *c, GetBitContext *gb, float *dst,
int dst_size, int type, float band_scale)
{
int i, val, val1, val2, sign;
for (i = 0; i < dst_size; i += 2) {
val = get_vlc2(gb, c->cb_vlc[type].table, 9, 2);
val1 = sign_extend(val >> 8, 8);
val2 = sign_extend(val & 0xFF, 8);
if (type == ON2AVC_ESC_CB) {
if (val1 <= -16 || val1 >= 16) {
sign = 1 - (val1 < 0) * 2;
val1 = sign * get_egolomb(gb);
}
if (val2 <= -16 || val2 >= 16) {
sign = 1 - (val2 < 0) * 2;
val2 = sign * get_egolomb(gb);
}
}
*dst++ = on2avc_scale(val1, band_scale);
*dst++ = on2avc_scale(val2, band_scale);
}
return 0;
}
static int on2avc_read_channel_data(On2AVCContext *c, GetBitContext *gb, int ch)
{
int ret;
int w, b, band_idx;
float *coeff_ptr;
if ((ret = on2avc_decode_band_types(c, gb)) < 0)
return ret;
if ((ret = on2avc_decode_band_scales(c, gb)) < 0)
return ret;
coeff_ptr = c->coeffs[ch];
band_idx = 0;
memset(coeff_ptr, 0, ON2AVC_SUBFRAME_SIZE * sizeof(*coeff_ptr));
for (w = 0; w < c->num_windows; w++) {
for (b = 0; b < c->num_bands; b++) {
int band_size = c->band_start[b + 1] - c->band_start[b];
int band_type = c->band_type[band_idx + b];
if (!band_type) {
coeff_ptr += band_size;
continue;
}
if (band_type < 9)
on2avc_decode_quads(c, gb, coeff_ptr, band_size, band_type,
c->band_scales[band_idx + b]);
else
on2avc_decode_pairs(c, gb, coeff_ptr, band_size, band_type,
c->band_scales[band_idx + b]);
coeff_ptr += band_size;
}
band_idx += c->num_bands;
}
return 0;
}
static int on2avc_apply_ms(On2AVCContext *c)
{
int w, b, i;
int band_off = 0;
float *ch0 = c->coeffs[0];
float *ch1 = c->coeffs[1];
for (w = 0; w < c->num_windows; w++) {
for (b = 0; b < c->num_bands; b++) {
if (c->ms_info[band_off + b]) {
for (i = c->band_start[b]; i < c->band_start[b + 1]; i++) {
float l = *ch0, r = *ch1;
*ch0++ = l + r;
*ch1++ = l - r;
}
} else {
ch0 += c->band_start[b + 1] - c->band_start[b];
ch1 += c->band_start[b + 1] - c->band_start[b];
}
}
band_off += c->num_bands;
}
return 0;
}
static void zero_head_and_tail(float *src, int len, int order0, int order1)
{
memset(src, 0, sizeof(*src) * order0);
memset(src + len - order1, 0, sizeof(*src) * order1);
}
static void pretwiddle(float *src, float *dst, int dst_len, int tab_step,
int step, int order0, int order1, const double * const *tabs)
{
float *src2, *out;
const double *tab;
int i, j;
out = dst;
tab = tabs[0];
for (i = 0; i < tab_step; i++) {
double sum = 0;
for (j = 0; j < order0; j++)
sum += src[j] * tab[j * tab_step + i];
out[i] += sum;
}
out = dst + dst_len - tab_step;
tab = tabs[order0];
src2 = src + (dst_len - tab_step) / step + 1 + order0;
for (i = 0; i < tab_step; i++) {
double sum = 0;
for (j = 0; j < order1; j++)
sum += src2[j] * tab[j * tab_step + i];
out[i] += sum;
}
}
static void twiddle(float *src1, float *src2, int src2_len,
const double *tab, int tab_len, int step,
int order0, int order1, const double * const *tabs)
{
int steps;
int mask;
int i, j;
steps = (src2_len - tab_len) / step + 1;
pretwiddle(src1, src2, src2_len, tab_len, step, order0, order1, tabs);
mask = tab_len - 1;
for (i = 0; i < steps; i++) {
float in0 = src1[order0 + i];
int pos = (src2_len - 1) & mask;
if (pos < tab_len) {
const double *t = tab;
for (j = pos; j >= 0; j--)
src2[j] += in0 * *t++;
for (j = 0; j < tab_len - pos - 1; j++)
src2[src2_len - j - 1] += in0 * tab[pos + 1 + j];
} else {
for (j = 0; j < tab_len; j++)
src2[pos - j] += in0 * tab[j];
}
mask = pos + step;
}
}
#define CMUL1_R(s, t, is, it) \
s[is + 0] * t[it + 0] - s[is + 1] * t[it + 1]
#define CMUL1_I(s, t, is, it) \
s[is + 0] * t[it + 1] + s[is + 1] * t[it + 0]
#define CMUL2_R(s, t, is, it) \
s[is + 0] * t[it + 0] + s[is + 1] * t[it + 1]
#define CMUL2_I(s, t, is, it) \
s[is + 0] * t[it + 1] - s[is + 1] * t[it + 0]
#define CMUL0(dst, id, s0, s1, s2, s3, t0, t1, t2, t3, is, it) \
dst[id] = s0[is] * t0[it] + s1[is] * t1[it] \
+ s2[is] * t2[it] + s3[is] * t3[it]; \
dst[id + 1] = s0[is] * t0[it + 1] + s1[is] * t1[it + 1] \
+ s2[is] * t2[it + 1] + s3[is] * t3[it + 1];
#define CMUL1(dst, s0, s1, s2, s3, t0, t1, t2, t3, is, it) \
*dst++ = CMUL1_R(s0, t0, is, it) \
+ CMUL1_R(s1, t1, is, it) \
+ CMUL1_R(s2, t2, is, it) \
+ CMUL1_R(s3, t3, is, it); \
*dst++ = CMUL1_I(s0, t0, is, it) \
+ CMUL1_I(s1, t1, is, it) \
+ CMUL1_I(s2, t2, is, it) \
+ CMUL1_I(s3, t3, is, it);
#define CMUL2(dst, s0, s1, s2, s3, t0, t1, t2, t3, is, it) \
*dst++ = CMUL2_R(s0, t0, is, it) \
+ CMUL2_R(s1, t1, is, it) \
+ CMUL2_R(s2, t2, is, it) \
+ CMUL2_R(s3, t3, is, it); \
*dst++ = CMUL2_I(s0, t0, is, it) \
+ CMUL2_I(s1, t1, is, it) \
+ CMUL2_I(s2, t2, is, it) \
+ CMUL2_I(s3, t3, is, it);
static void combine_fft(float *s0, float *s1, float *s2, float *s3, float *dst,
const float *t0, const float *t1,
const float *t2, const float *t3, int len, int step)
{
const float *h0, *h1, *h2, *h3;
float *d1, *d2;
int tmp, half;
int len2 = len >> 1, len4 = len >> 2;
int hoff;
int i, j, k;
tmp = step;
for (half = len2; tmp > 1; half <<= 1, tmp >>= 1);
h0 = t0 + half;
h1 = t1 + half;
h2 = t2 + half;
h3 = t3 + half;
CMUL0(dst, 0, s0, s1, s2, s3, t0, t1, t2, t3, 0, 0);
hoff = 2 * step * (len4 >> 1);
j = 2;
k = 2 * step;
d1 = dst + 2;
d2 = dst + 2 + (len >> 1);
for (i = 0; i < (len4 - 1) >> 1; i++) {
CMUL1(d1, s0, s1, s2, s3, t0, t1, t2, t3, j, k);
CMUL1(d2, s0, s1, s2, s3, h0, h1, h2, h3, j, k);
j += 2;
k += 2 * step;
}
CMUL0(dst, len4, s0, s1, s2, s3, t0, t1, t2, t3, 1, hoff);
CMUL0(dst, len4 + len2, s0, s1, s2, s3, h0, h1, h2, h3, 1, hoff);
j = len4;
k = hoff + 2 * step * len4;
d1 = dst + len4 + 2;
d2 = dst + len4 + 2 + len2;
for (i = 0; i < (len4 - 2) >> 1; i++) {
CMUL2(d1, s0, s1, s2, s3, t0, t1, t2, t3, j, k);
CMUL2(d2, s0, s1, s2, s3, h0, h1, h2, h3, j, k);
j -= 2;
k += 2 * step;
}
CMUL0(dst, len2 + 4, s0, s1, s2, s3, t0, t1, t2, t3, 0, k);
}
static void wtf_end_512(On2AVCContext *c, float *out, float *src,
float *tmp0, float *tmp1)
{
memcpy(tmp1, tmp0, 384 * sizeof(*tmp0));
memcpy(tmp0 + 384, tmp1 + 384, 128 * sizeof(*tmp0));
zero_head_and_tail(tmp1, 128, 16, 4);
zero_head_and_tail(tmp1 + 128, 128, 16, 4);
zero_head_and_tail(tmp1 + 256, 128, 13, 7);
zero_head_and_tail(tmp1 + 384, 128, 15, 5);
c->fft64_fn(c->fft64, src + 0, tmp1 + 0, sizeof(float));
c->fft64_fn(c->fft64, src + 128, tmp1 + 128, sizeof(float));
c->fft64_fn(c->fft64, src + 256, tmp1 + 256, sizeof(float));
c->fft64_fn(c->fft64, src + 384, tmp1 + 384, sizeof(float));
combine_fft(src, src + 128, src + 256, src + 384, tmp1,
ff_on2avc_ctab_1, ff_on2avc_ctab_2,
ff_on2avc_ctab_3, ff_on2avc_ctab_4, 512, 2);
c->fft256_fn(c->fft256, src, tmp1, sizeof(float));
pretwiddle(&tmp0[ 0], src, 512, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
pretwiddle(&tmp0[128], src, 512, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
pretwiddle(&tmp0[256], src, 512, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
pretwiddle(&tmp0[384], src, 512, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
}
static void wtf_end_1024(On2AVCContext *c, float *out, float *src,
float *tmp0, float *tmp1)
{
memcpy(tmp1, tmp0, 768 * sizeof(*tmp0));
memcpy(tmp0 + 768, tmp1 + 768, 256 * sizeof(*tmp0));
zero_head_and_tail(tmp1, 256, 16, 4);
zero_head_and_tail(tmp1 + 256, 256, 16, 4);
zero_head_and_tail(tmp1 + 512, 256, 13, 7);
zero_head_and_tail(tmp1 + 768, 256, 15, 5);
c->fft128_fn(c->fft128, src + 0, tmp1 + 0, sizeof(float));
c->fft128_fn(c->fft128, src + 256, tmp1 + 256, sizeof(float));
c->fft128_fn(c->fft128, src + 512, tmp1 + 512, sizeof(float));
c->fft128_fn(c->fft128, src + 768, tmp1 + 768, sizeof(float));
combine_fft(src, src + 256, src + 512, src + 768, tmp1,
ff_on2avc_ctab_1, ff_on2avc_ctab_2,
ff_on2avc_ctab_3, ff_on2avc_ctab_4, 1024, 1);
c->fft512_fn(c->fft512, src, tmp1, sizeof(float));
pretwiddle(&tmp0[ 0], src, 1024, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
pretwiddle(&tmp0[256], src, 1024, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
pretwiddle(&tmp0[512], src, 1024, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
pretwiddle(&tmp0[768], src, 1024, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
}
static void wtf_40(On2AVCContext *c, float *out, float *src, int size)
{
float *tmp0 = c->temp, *tmp1 = c->temp + 1024;
memset(tmp0, 0, sizeof(*tmp0) * 1024);
memset(tmp1, 0, sizeof(*tmp1) * 1024);
if (size == 512) {
twiddle(src, &tmp0[ 0], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
twiddle(src + 8, &tmp0[ 0], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
twiddle(src + 16, &tmp0[ 16], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
twiddle(src + 24, &tmp0[ 16], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
twiddle(src + 32, &tmp0[ 32], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
twiddle(src + 40, &tmp0[ 32], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
twiddle(src + 48, &tmp0[ 48], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
twiddle(src + 56, &tmp0[ 48], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
twiddle(&tmp0[ 0], &tmp1[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(&tmp0[16], &tmp1[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(&tmp0[32], &tmp1[ 32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(&tmp0[48], &tmp1[ 32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 64, &tmp1[ 64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 80, &tmp1[ 64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 96, &tmp1[ 96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 112, &tmp1[ 96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 128, &tmp1[128], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 144, &tmp1[128], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 160, &tmp1[160], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 176, &tmp1[160], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
memset(tmp0, 0, 64 * sizeof(*tmp0));
twiddle(&tmp1[ 0], &tmp0[ 0], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
twiddle(&tmp1[ 32], &tmp0[ 0], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
twiddle(&tmp1[ 64], &tmp0[ 0], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
twiddle(&tmp1[ 96], &tmp0[ 0], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
twiddle(&tmp1[128], &tmp0[128], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
twiddle(&tmp1[160], &tmp0[128], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
twiddle(src + 192, &tmp0[128], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
twiddle(src + 224, &tmp0[128], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
twiddle(src + 256, &tmp0[256], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
twiddle(src + 288, &tmp0[256], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
twiddle(src + 320, &tmp0[256], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
twiddle(src + 352, &tmp0[256], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
wtf_end_512(c, out, src, tmp0, tmp1);
} else {
twiddle(src, &tmp0[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 16, &tmp0[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 32, &tmp0[ 32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 48, &tmp0[ 32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 64, &tmp0[ 64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 80, &tmp0[ 64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 96, &tmp0[ 96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 112, &tmp0[ 96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(&tmp0[ 0], &tmp1[ 0], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
twiddle(&tmp0[32], &tmp1[ 0], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
twiddle(&tmp0[64], &tmp1[ 64], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
twiddle(&tmp0[96], &tmp1[ 64], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
twiddle(src + 128, &tmp1[128], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
twiddle(src + 160, &tmp1[128], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
twiddle(src + 192, &tmp1[192], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
twiddle(src + 224, &tmp1[192], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
twiddle(src + 256, &tmp1[256], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
twiddle(src + 288, &tmp1[256], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
twiddle(src + 320, &tmp1[320], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
twiddle(src + 352, &tmp1[320], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
memset(tmp0, 0, 128 * sizeof(*tmp0));
twiddle(&tmp1[ 0], &tmp0[ 0], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
twiddle(&tmp1[ 64], &tmp0[ 0], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
twiddle(&tmp1[128], &tmp0[ 0], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
twiddle(&tmp1[192], &tmp0[ 0], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
twiddle(&tmp1[256], &tmp0[256], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
twiddle(&tmp1[320], &tmp0[256], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
twiddle(src + 384, &tmp0[256], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
twiddle(src + 448, &tmp0[256], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
twiddle(src + 512, &tmp0[512], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
twiddle(src + 576, &tmp0[512], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
twiddle(src + 640, &tmp0[512], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
twiddle(src + 704, &tmp0[512], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
wtf_end_1024(c, out, src, tmp0, tmp1);
}
}
static void wtf_44(On2AVCContext *c, float *out, float *src, int size)
{
float *tmp0 = c->temp, *tmp1 = c->temp + 1024;
memset(tmp0, 0, sizeof(*tmp0) * 1024);
memset(tmp1, 0, sizeof(*tmp1) * 1024);
if (size == 512) {
twiddle(src, &tmp0[ 0], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
twiddle(src + 8, &tmp0[ 0], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
twiddle(src + 16, &tmp0[16], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
twiddle(src + 24, &tmp0[16], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
twiddle(src + 32, &tmp0[32], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
twiddle(src + 40, &tmp0[32], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
twiddle(src + 48, &tmp0[48], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
twiddle(src + 56, &tmp0[48], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
twiddle(&tmp0[ 0], &tmp1[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(&tmp0[16], &tmp1[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(&tmp0[32], &tmp1[32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(&tmp0[48], &tmp1[32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 64, &tmp1[64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 80, &tmp1[64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 96, &tmp1[96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 112, &tmp1[96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
memset(tmp0, 0, 64 * sizeof(*tmp0));
twiddle(&tmp1[ 0], &tmp0[ 0], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
twiddle(&tmp1[32], &tmp0[ 0], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
twiddle(&tmp1[64], &tmp0[ 0], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
twiddle(&tmp1[96], &tmp0[ 0], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
twiddle(src + 128, &tmp0[128], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
twiddle(src + 160, &tmp0[128], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
twiddle(src + 192, &tmp0[128], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
twiddle(src + 224, &tmp0[128], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
twiddle(src + 256, &tmp0[256], 128, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
twiddle(src + 320, &tmp0[256], 128, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
wtf_end_512(c, out, src, tmp0, tmp1);
} else {
twiddle(src, &tmp0[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 16, &tmp0[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 32, &tmp0[ 32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 48, &tmp0[ 32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 64, &tmp0[ 64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(src + 80, &tmp0[ 64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 96, &tmp0[ 96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
twiddle(src + 112, &tmp0[ 96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
twiddle(&tmp0[ 0], &tmp1[ 0], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
twiddle(&tmp0[32], &tmp1[ 0], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
twiddle(&tmp0[64], &tmp1[ 64], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
twiddle(&tmp0[96], &tmp1[ 64], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
twiddle(src + 128, &tmp1[128], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
twiddle(src + 160, &tmp1[128], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
twiddle(src + 192, &tmp1[192], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
twiddle(src + 224, &tmp1[192], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
memset(tmp0, 0, 128 * sizeof(*tmp0));
twiddle(&tmp1[ 0], &tmp0[ 0], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
twiddle(&tmp1[ 64], &tmp0[ 0], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
twiddle(&tmp1[128], &tmp0[ 0], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
twiddle(&tmp1[192], &tmp0[ 0], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
twiddle(src + 256, &tmp0[256], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
twiddle(src + 320, &tmp0[256], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
twiddle(src + 384, &tmp0[256], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
twiddle(src + 448, &tmp0[256], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
twiddle(src + 512, &tmp0[512], 256, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
twiddle(src + 640, &tmp0[512], 256, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
wtf_end_1024(c, out, src, tmp0, tmp1);
}
}
static int on2avc_reconstruct_channel_ext(On2AVCContext *c, AVFrame *dst, int offset)
{
int ch, i;
for (ch = 0; ch < c->avctx->ch_layout.nb_channels; ch++) {
float *out = (float*)dst->extended_data[ch] + offset;
float *in = c->coeffs[ch];
float *saved = c->delay[ch];
float *buf = c->mdct_buf;
float *wout = out + 448;
switch (c->window_type) {
case WINDOW_TYPE_EXT7:
c->mdct_fn(c->mdct, buf, in, sizeof(float));
break;
case WINDOW_TYPE_EXT4:
c->wtf(c, buf, in, 1024);
break;
case WINDOW_TYPE_EXT5:
c->wtf(c, buf, in, 512);
c->mdct_half_fn(c->mdct_half, buf + 512, in + 512, sizeof(float));
for (i = 0; i < 256; i++) {
FFSWAP(float, buf[i + 512], buf[1023 - i]);
}
break;
case WINDOW_TYPE_EXT6:
c->mdct_half_fn(c->mdct_half, buf, in, sizeof(float));
for (i = 0; i < 256; i++) {
FFSWAP(float, buf[i], buf[511 - i]);
}
c->wtf(c, buf + 512, in + 512, 512);
break;
}
memcpy(out, saved, 448 * sizeof(float));
c->fdsp->vector_fmul_window(wout, saved + 448, buf, c->short_win, 64);
memcpy(wout + 128, buf + 64, 448 * sizeof(float));
memcpy(saved, buf + 512, 448 * sizeof(float));
memcpy(saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
}
return 0;
}
// not borrowed from aacdec.c - the codec has original design after all
static int on2avc_reconstruct_channel(On2AVCContext *c, int channel,
AVFrame *dst, int offset)
{
int i;
float *out = (float*)dst->extended_data[channel] + offset;
float *in = c->coeffs[channel];
float *saved = c->delay[channel];
float *buf = c->mdct_buf;
float *temp = c->temp;
switch (c->window_type) {
case WINDOW_TYPE_LONG_START:
case WINDOW_TYPE_LONG_STOP:
case WINDOW_TYPE_LONG:
c->mdct_fn(c->mdct, buf, in, sizeof(float));
break;
case WINDOW_TYPE_8SHORT:
for (i = 0; i < ON2AVC_SUBFRAME_SIZE; i += ON2AVC_SUBFRAME_SIZE / 8)
c->mdct_small_fn(c->mdct_small, buf + i, in + i, sizeof(float));
break;
}
if ((c->prev_window_type == WINDOW_TYPE_LONG ||
c->prev_window_type == WINDOW_TYPE_LONG_STOP) &&
(c->window_type == WINDOW_TYPE_LONG ||
c->window_type == WINDOW_TYPE_LONG_START)) {
c->fdsp->vector_fmul_window(out, saved, buf, c->long_win, 512);
} else {
float *wout = out + 448;
memcpy(out, saved, 448 * sizeof(float));
if (c->window_type == WINDOW_TYPE_8SHORT) {
c->fdsp->vector_fmul_window(wout + 0*128, saved + 448, buf + 0*128, c->short_win, 64);
c->fdsp->vector_fmul_window(wout + 1*128, buf + 0*128 + 64, buf + 1*128, c->short_win, 64);
c->fdsp->vector_fmul_window(wout + 2*128, buf + 1*128 + 64, buf + 2*128, c->short_win, 64);
c->fdsp->vector_fmul_window(wout + 3*128, buf + 2*128 + 64, buf + 3*128, c->short_win, 64);
c->fdsp->vector_fmul_window(temp, buf + 3*128 + 64, buf + 4*128, c->short_win, 64);
memcpy(wout + 4*128, temp, 64 * sizeof(float));
} else {
c->fdsp->vector_fmul_window(wout, saved + 448, buf, c->short_win, 64);
memcpy(wout + 128, buf + 64, 448 * sizeof(float));
}
}
// buffer update
switch (c->window_type) {
case WINDOW_TYPE_8SHORT:
memcpy(saved, temp + 64, 64 * sizeof(float));
c->fdsp->vector_fmul_window(saved + 64, buf + 4*128 + 64, buf + 5*128, c->short_win, 64);
c->fdsp->vector_fmul_window(saved + 192, buf + 5*128 + 64, buf + 6*128, c->short_win, 64);
c->fdsp->vector_fmul_window(saved + 320, buf + 6*128 + 64, buf + 7*128, c->short_win, 64);
memcpy(saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
break;
case WINDOW_TYPE_LONG_START:
memcpy(saved, buf + 512, 448 * sizeof(float));
memcpy(saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
break;
case WINDOW_TYPE_LONG_STOP:
case WINDOW_TYPE_LONG:
memcpy(saved, buf + 512, 512 * sizeof(float));
break;
}
return 0;
}
static int on2avc_decode_subframe(On2AVCContext *c, const uint8_t *buf,
int buf_size, AVFrame *dst, int offset)
{
GetBitContext gb;
int i, ret;
if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
return ret;
if (get_bits1(&gb)) {
av_log(c->avctx, AV_LOG_ERROR, "enh bit set\n");
return AVERROR_INVALIDDATA;
}
c->prev_window_type = c->window_type;
c->window_type = get_bits(&gb, 3);
c->band_start = c->modes[c->window_type].band_start;
c->num_windows = c->modes[c->window_type].num_windows;
c->num_bands = c->modes[c->window_type].num_bands;
c->is_long = (c->window_type != WINDOW_TYPE_8SHORT);
c->grouping[0] = 1;
for (i = 1; i < c->num_windows; i++)
c->grouping[i] = !get_bits1(&gb);
on2avc_read_ms_info(c, &gb);
for (i = 0; i < c->avctx->ch_layout.nb_channels; i++)
if ((ret = on2avc_read_channel_data(c, &gb, i)) < 0)
return AVERROR_INVALIDDATA;
if (c->avctx->ch_layout.nb_channels == 2 && c->ms_present)
on2avc_apply_ms(c);
if (c->window_type < WINDOW_TYPE_EXT4) {
for (i = 0; i < c->avctx->ch_layout.nb_channels; i++)
on2avc_reconstruct_channel(c, i, dst, offset);
} else {
on2avc_reconstruct_channel_ext(c, dst, offset);
}
return 0;
}
static int on2avc_decode_frame(AVCodecContext * avctx, AVFrame *frame,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
On2AVCContext *c = avctx->priv_data;
GetByteContext gb;
int num_frames = 0, frame_size, audio_off;
int ret;
if (c->is_av500) {
/* get output buffer */
frame->nb_samples = ON2AVC_SUBFRAME_SIZE;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
if ((ret = on2avc_decode_subframe(c, buf, buf_size, frame, 0)) < 0)
return ret;
} else {
bytestream2_init(&gb, buf, buf_size);
while (bytestream2_get_bytes_left(&gb) > 2) {
frame_size = bytestream2_get_le16(&gb);
if (!frame_size || frame_size > bytestream2_get_bytes_left(&gb)) {
av_log(avctx, AV_LOG_ERROR, "Invalid subframe size %d\n",
frame_size);
return AVERROR_INVALIDDATA;
}
num_frames++;
bytestream2_skip(&gb, frame_size);
}
if (!num_frames) {
av_log(avctx, AV_LOG_ERROR, "No subframes present\n");
return AVERROR_INVALIDDATA;
}
/* get output buffer */
frame->nb_samples = ON2AVC_SUBFRAME_SIZE * num_frames;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
audio_off = 0;
bytestream2_init(&gb, buf, buf_size);
while (bytestream2_get_bytes_left(&gb) > 2) {
frame_size = bytestream2_get_le16(&gb);
if ((ret = on2avc_decode_subframe(c, gb.buffer, frame_size,
frame, audio_off)) < 0)
return ret;
audio_off += ON2AVC_SUBFRAME_SIZE;
bytestream2_skip(&gb, frame_size);
}
}
*got_frame_ptr = 1;
return buf_size;
}
static av_cold void on2avc_free_vlcs(On2AVCContext *c)
{
int i;
ff_free_vlc(&c->scale_diff);
for (i = 1; i < 16; i++)
ff_free_vlc(&c->cb_vlc[i]);
}
static av_cold int on2avc_decode_init(AVCodecContext *avctx)
{
On2AVCContext *c = avctx->priv_data;
const uint8_t *lens = ff_on2avc_cb_lens;
const uint16_t *syms = ff_on2avc_cb_syms;
int channels = avctx->ch_layout.nb_channels;
float scale;
int i, ret;
if (channels > 2U) {
avpriv_request_sample(avctx, "Decoding more than 2 channels");
return AVERROR_PATCHWELCOME;
}
c->avctx = avctx;
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
av_channel_layout_uninit(&avctx->ch_layout);
avctx->ch_layout = (channels == 2) ? (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO :
(AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
c->is_av500 = (avctx->codec_tag == 0x500);
if (channels == 2)
av_log(avctx, AV_LOG_WARNING,
"Stereo mode support is not good, patch is welcome\n");
// We add -0.01 before ceil() to avoid any values to fall at exactly the
// midpoint between different ceil values. The results are identical to
// using pow(10, i / 10.0) without such bias
for (i = 0; i < 20; i++)
c->scale_tab[i] = ceil(ff_exp10(i * 0.1) * 16 - 0.01) / 32;
for (; i < 128; i++)
c->scale_tab[i] = ceil(ff_exp10(i * 0.1) * 0.5 - 0.01);
if (avctx->sample_rate < 32000 || channels == 1)
memcpy(c->long_win, ff_on2avc_window_long_24000,
1024 * sizeof(*c->long_win));
else
memcpy(c->long_win, ff_on2avc_window_long_32000,
1024 * sizeof(*c->long_win));
memcpy(c->short_win, ff_on2avc_window_short, 128 * sizeof(*c->short_win));
c->modes = (avctx->sample_rate <= 40000) ? ff_on2avc_modes_40
: ff_on2avc_modes_44;
c->wtf = (avctx->sample_rate <= 40000) ? wtf_40
: wtf_44;
scale = 1.0 / (1024*32768);
if ((ret = av_tx_init(&c->mdct, &c->mdct_fn, AV_TX_FLOAT_MDCT, 1, 1024, &scale, 0)) < 0)
return ret;
scale = 1.0 / (512*32768);
if ((ret = av_tx_init(&c->mdct_half, &c->mdct_half_fn, AV_TX_FLOAT_MDCT, 1, 512, &scale, 0)) < 0)
return ret;
scale = 1.0 / (128*32768);
if ((ret = av_tx_init(&c->mdct_small, &c->mdct_small_fn, AV_TX_FLOAT_MDCT, 1, 128, &scale, 0)) < 0)
return ret;
if ((ret = av_tx_init(&c->fft512, &c->fft512_fn, AV_TX_FLOAT_FFT, 1, 512, NULL, 0)) < 0)
return ret;
if ((ret = av_tx_init(&c->fft256, &c->fft256_fn, AV_TX_FLOAT_FFT, 1, 256, NULL, 0)) < 0)
return ret;
if ((ret = av_tx_init(&c->fft128, &c->fft128_fn, AV_TX_FLOAT_FFT, 0, 128, NULL, 0)) < 0)
return ret;
if ((ret = av_tx_init(&c->fft64, &c->fft64_fn, AV_TX_FLOAT_FFT, 0, 64, NULL, 0)) < 0)
return ret;
c->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
if (!c->fdsp)
return AVERROR(ENOMEM);
ret = ff_init_vlc_from_lengths(&c->scale_diff, 9, ON2AVC_SCALE_DIFFS,
ff_on2avc_scale_diff_bits, 1,
ff_on2avc_scale_diff_syms, 1, 1, -60, 0, avctx);
if (ret < 0)
goto vlc_fail;
for (i = 1; i < 16; i++) {
int idx = i - 1;
ret = ff_init_vlc_from_lengths(&c->cb_vlc[i], 9, ff_on2avc_cb_elems[idx],
lens, 1,
syms, 2, 2, 0, 0, avctx);
if (ret < 0)
goto vlc_fail;
lens += ff_on2avc_cb_elems[idx];
syms += ff_on2avc_cb_elems[idx];
}
return 0;
vlc_fail:
av_log(avctx, AV_LOG_ERROR, "Cannot init VLC\n");
return ret;
}
static av_cold int on2avc_decode_close(AVCodecContext *avctx)
{
On2AVCContext *c = avctx->priv_data;
av_tx_uninit(&c->mdct);
av_tx_uninit(&c->mdct_half);
av_tx_uninit(&c->mdct_small);
av_tx_uninit(&c->fft64);
av_tx_uninit(&c->fft128);
av_tx_uninit(&c->fft256);
av_tx_uninit(&c->fft512);
av_freep(&c->fdsp);
on2avc_free_vlcs(c);
return 0;
}
const FFCodec ff_on2avc_decoder = {
.p.name = "on2avc",
CODEC_LONG_NAME("On2 Audio for Video Codec"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_ON2AVC,
.priv_data_size = sizeof(On2AVCContext),
.init = on2avc_decode_init,
FF_CODEC_DECODE_CB(on2avc_decode_frame),
.close = on2avc_decode_close,
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_NONE },
};
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