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ffmpeg/libavcodec/on2avc.c
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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 "avcodec.h"
#include "bytestream.h"
#include "fft.h"
#include "get_bits.h"
#include "internal.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;
FFTContext mdct, mdct_half, mdct_small;
FFTContext fft128, fft256, fft512, fft1024;
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(src, tmp0, 384 * sizeof(*tmp0));
memcpy(tmp0 + 384, src + 384, 128 * sizeof(*tmp0));
zero_head_and_tail(src, 128, 16, 4);
zero_head_and_tail(src + 128, 128, 16, 4);
zero_head_and_tail(src + 256, 128, 13, 7);
zero_head_and_tail(src + 384, 128, 15, 5);
c->fft128.fft_permute(&c->fft128, (FFTComplex*)src);
c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 128));
c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 256));
c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 384));
c->fft128.fft_calc(&c->fft128, (FFTComplex*)src);
c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 128));
c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 256));
c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 384));
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->fft512.fft_permute(&c->fft512, (FFTComplex*)tmp1);
c->fft512.fft_calc(&c->fft512, (FFTComplex*)tmp1);
pretwiddle(&tmp0[ 0], tmp1, 512, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
pretwiddle(&tmp0[128], tmp1, 512, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
pretwiddle(&tmp0[256], tmp1, 512, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
pretwiddle(&tmp0[384], tmp1, 512, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
memcpy(src, tmp1, 512 * sizeof(float));
}
static void wtf_end_1024(On2AVCContext *c, float *out, float *src,
float *tmp0, float *tmp1)
{
memcpy(src, tmp0, 768 * sizeof(*tmp0));
memcpy(tmp0 + 768, src + 768, 256 * sizeof(*tmp0));
zero_head_and_tail(src, 256, 16, 4);
zero_head_and_tail(src + 256, 256, 16, 4);
zero_head_and_tail(src + 512, 256, 13, 7);
zero_head_and_tail(src + 768, 256, 15, 5);
c->fft256.fft_permute(&c->fft256, (FFTComplex*)src);
c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 256));
c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 512));
c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 768));
c->fft256.fft_calc(&c->fft256, (FFTComplex*)src);
c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 256));
c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 512));
c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 768));
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->fft1024.fft_permute(&c->fft1024, (FFTComplex*)tmp1);
c->fft1024.fft_calc(&c->fft1024, (FFTComplex*)tmp1);
pretwiddle(&tmp0[ 0], tmp1, 1024, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
pretwiddle(&tmp0[256], tmp1, 1024, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
pretwiddle(&tmp0[512], tmp1, 1024, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
pretwiddle(&tmp0[768], tmp1, 1024, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
memcpy(src, tmp1, 1024 * sizeof(float));
}
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->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.imdct_half(&c->mdct, buf, in);
break;
case WINDOW_TYPE_EXT4:
c->wtf(c, buf, in, 1024);
break;
case WINDOW_TYPE_EXT5:
c->wtf(c, buf, in, 512);
c->mdct.imdct_half(&c->mdct_half, buf + 512, in + 512);
for (i = 0; i < 256; i++) {
FFSWAP(float, buf[i + 512], buf[1023 - i]);
}
break;
case WINDOW_TYPE_EXT6:
c->mdct.imdct_half(&c->mdct_half, buf, in);
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.imdct_half(&c->mdct, buf, in);
break;
case WINDOW_TYPE_8SHORT:
for (i = 0; i < ON2AVC_SUBFRAME_SIZE; i += ON2AVC_SUBFRAME_SIZE / 8)
c->mdct_small.imdct_half(&c->mdct_small, buf + i, in + i);
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->channels; i++)
if ((ret = on2avc_read_channel_data(c, &gb, i)) < 0)
return AVERROR_INVALIDDATA;
if (c->avctx->channels == 2 && c->ms_present)
on2avc_apply_ms(c);
if (c->window_type < WINDOW_TYPE_EXT4) {
for (i = 0; i < c->avctx->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, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
AVFrame *frame = data;
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 i, ret;
if (avctx->channels > 2U) {
avpriv_request_sample(avctx, "Decoding more than 2 channels");
return AVERROR_PATCHWELCOME;
}
c->avctx = avctx;
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO
: AV_CH_LAYOUT_MONO;
c->is_av500 = (avctx->codec_tag == 0x500);
if (avctx->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 || avctx->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;
ff_mdct_init(&c->mdct, 11, 1, 1.0 / (32768.0 * 1024.0));
ff_mdct_init(&c->mdct_half, 10, 1, 1.0 / (32768.0 * 512.0));
ff_mdct_init(&c->mdct_small, 8, 1, 1.0 / (32768.0 * 128.0));
ff_fft_init(&c->fft128, 6, 0);
ff_fft_init(&c->fft256, 7, 0);
ff_fft_init(&c->fft512, 8, 1);
ff_fft_init(&c->fft1024, 9, 1);
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;
ff_mdct_end(&c->mdct);
ff_mdct_end(&c->mdct_half);
ff_mdct_end(&c->mdct_small);
ff_fft_end(&c->fft128);
ff_fft_end(&c->fft256);
ff_fft_end(&c->fft512);
ff_fft_end(&c->fft1024);
av_freep(&c->fdsp);
on2avc_free_vlcs(c);
return 0;
}
AVCodec ff_on2avc_decoder = {
.name = "on2avc",
.long_name = NULL_IF_CONFIG_SMALL("On2 Audio for Video Codec"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_ON2AVC,
.priv_data_size = sizeof(On2AVCContext),
.init = on2avc_decode_init,
.decode = on2avc_decode_frame,
.close = on2avc_decode_close,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_NONE },
};
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