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-rw-r--r--libavcodec/atrac9dec.c954
1 files changed, 954 insertions, 0 deletions
diff --git a/libavcodec/atrac9dec.c b/libavcodec/atrac9dec.c
new file mode 100644
index 0000000000..805d46f3b8
--- /dev/null
+++ b/libavcodec/atrac9dec.c
@@ -0,0 +1,954 @@
+/*
+ * ATRAC9 decoder
+ * Copyright (c) 2018 Rostislav Pehlivanov <atomnuker@gmail.com>
+ *
+ * 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 "internal.h"
+#include "get_bits.h"
+#include "fft.h"
+#include "atrac9tab.h"
+#include "libavutil/lfg.h"
+#include "libavutil/float_dsp.h"
+
+typedef struct ATRAC9ChannelData {
+ int band_ext;
+ int q_unit_cnt;
+ int band_ext_data[4];
+ int32_t scalefactors[31];
+ int32_t scalefactors_prev[31];
+
+ int precision_coarse[30];
+ int precision_fine[30];
+ int precision_mask[30];
+
+ int codebookset[30];
+
+ int32_t q_coeffs_coarse[256];
+ int32_t q_coeffs_fine[256];
+
+ DECLARE_ALIGNED(32, float, coeffs )[256];
+ DECLARE_ALIGNED(32, float, prev_win)[128];
+} ATRAC9ChannelData;
+
+typedef struct ATRAC9BlockData {
+ ATRAC9ChannelData channel[2];
+
+ /* Base */
+ int band_count;
+ int q_unit_cnt;
+ int q_unit_cnt_prev;
+
+ /* Stereo block only */
+ int stereo_q_unit;
+
+ /* Band extension only */
+ int has_band_ext;
+ int has_band_ext_data;
+ int band_ext_q_unit;
+
+ /* Gradient */
+ int grad_mode;
+ int grad_boundary;
+ int gradient[31];
+
+ /* Stereo */
+ int cpe_base_channel;
+ int is_signs[30];
+
+} ATRAC9BlockData;
+
+typedef struct ATRAC9Context {
+ AVCodecContext *avctx;
+ AVFloatDSPContext *fdsp;
+ FFTContext imdct;
+ ATRAC9BlockData block[5];
+ AVLFG lfg;
+
+ /* Set on init */
+ int frame_log2;
+ int avg_frame_size;
+ int frame_count;
+ int samplerate_idx;
+ const ATRAC9BlockConfig *block_config;
+
+ /* Generated on init */
+ VLC sf_vlc[2][8]; /* Signed/unsigned, length */
+ VLC coeff_vlc[2][8][4]; /* Cookbook, precision, cookbook index */
+ uint8_t alloc_curve[48][48];
+ DECLARE_ALIGNED(32, float, imdct_win)[256];
+
+ DECLARE_ALIGNED(32, float, temp)[256];
+} ATRAC9Context;
+
+static inline int parse_gradient(ATRAC9Context *s, ATRAC9BlockData *b,
+ GetBitContext *gb)
+{
+ int grad_range[2];
+ int grad_value[2];
+ int values, sign, base;
+ uint8_t *curve;
+ float scale;
+
+ b->grad_mode = get_bits(gb, 2);
+ if (b->grad_mode) {
+ grad_range[0] = get_bits(gb, 5);
+ grad_range[1] = 31;
+ grad_value[0] = get_bits(gb, 5);
+ grad_value[1] = 31;
+ } else {
+ grad_range[0] = get_bits(gb, 6);
+ grad_range[1] = get_bits(gb, 6) + 1;
+ grad_value[0] = get_bits(gb, 5);
+ grad_value[1] = get_bits(gb, 5);
+ }
+ b->grad_boundary = get_bits(gb, 4);
+
+ if (grad_range[0] >= grad_range[1] || grad_range[1] > 47)
+ return AVERROR_INVALIDDATA;
+
+ if (grad_value[0] > 31 || grad_value[1] > 31)
+ return AVERROR_INVALIDDATA;
+
+ if (b->grad_boundary > b->q_unit_cnt)
+ return AVERROR_INVALIDDATA;
+
+ values = grad_value[1] - grad_value[0];
+ sign = 1 - 2*(values < 0);
+ base = grad_value[0] + sign;
+ scale = (FFABS(values) - 1) / 31.0f;
+ curve = s->alloc_curve[grad_range[1] - grad_range[0] - 1];
+
+ for (int i = 0; i <= b->q_unit_cnt; i++)
+ b->gradient[i] = grad_value[i >= grad_range[0]];
+
+ for (int i = grad_range[0]; i < grad_range[1]; i++)
+ b->gradient[i] = base + sign*((int)(scale*curve[i - grad_range[0]]));
+
+ return 0;
+}
+
+static inline void calc_precision(ATRAC9Context *s, ATRAC9BlockData *b,
+ ATRAC9ChannelData *c)
+{
+ memset(c->precision_mask, 0, sizeof(c->precision_mask));
+ for (int i = 1; i < b->q_unit_cnt; i++) {
+ const int delta = FFABS(c->scalefactors[i] - c->scalefactors[i - 1]) - 1;
+ if (delta > 0) {
+ const int neg = c->scalefactors[i - 1] > c->scalefactors[i];
+ c->precision_mask[i - neg] += FFMIN(delta, 5);
+ }
+ }
+
+ if (b->grad_mode) {
+ for (int i = 0; i < b->q_unit_cnt; i++) {
+ c->precision_coarse[i] = c->scalefactors[i];
+ c->precision_coarse[i] += c->precision_mask[i] - b->gradient[i];
+ if (c->precision_coarse[i] < 0)
+ continue;
+ switch (b->grad_mode) {
+ case 1:
+ c->precision_coarse[i] >>= 1;
+ break;
+ case 2:
+ c->precision_coarse[i] = (3 * c->precision_coarse[i]) >> 3;
+ break;
+ case 3:
+ c->precision_coarse[i] >>= 2;
+ break;
+ }
+ }
+ } else {
+ for (int i = 0; i < b->q_unit_cnt; i++)
+ c->precision_coarse[i] = c->scalefactors[i] - b->gradient[i];
+ }
+
+
+ for (int i = 0; i < b->q_unit_cnt; i++)
+ c->precision_coarse[i] = FFMAX(c->precision_coarse[i], 1);
+
+ for (int i = 0; i < b->grad_boundary; i++)
+ c->precision_coarse[i]++;
+
+ for (int i = 0; i < b->q_unit_cnt; i++) {
+ c->precision_fine[i] = 0;
+ if (c->precision_coarse[i] > 15) {
+ c->precision_fine[i] = c->precision_coarse[i] - 15;
+ c->precision_coarse[i] = 15;
+ }
+ }
+}
+
+static inline int parse_band_ext(ATRAC9Context *s, ATRAC9BlockData *b,
+ GetBitContext *gb, int stereo)
+{
+ int ext_band = 0;
+
+ if (b->has_band_ext) {
+ ext_band = at9_tab_band_ext_group[b->q_unit_cnt - 13][2];
+ if (stereo) {
+ b->channel[1].band_ext = get_bits(gb, 2);
+ b->channel[1].band_ext = ext_band > 2 ? b->channel[1].band_ext : 4;
+ } else {
+ skip_bits1(gb);
+ }
+ }
+
+ b->has_band_ext_data = get_bits1(gb);
+ if (!b->has_band_ext_data)
+ return 0;
+
+ if (!b->has_band_ext) {
+ skip_bits(gb, 2);
+ skip_bits_long(gb, get_bits(gb, 5));
+ return 0;
+ }
+
+ b->channel[0].band_ext = get_bits(gb, 2);
+ b->channel[0].band_ext = ext_band > 2 ? b->channel[0].band_ext : 4;
+
+ if (!get_bits(gb, 5))
+ return 0;
+
+ for (int i = 0; i <= stereo; i++) {
+ ATRAC9ChannelData *c = &b->channel[i];
+ const int count = at9_tab_band_ext_cnt[c->band_ext][ext_band];
+ for (int j = 0; j < count; j++) {
+ int len = at9_tab_band_ext_lengths[c->band_ext][ext_band][j];
+ c->band_ext_data[j] = get_bits(gb, len);
+ }
+ }
+
+ return 0;
+}
+
+static inline int read_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
+ ATRAC9ChannelData *c, GetBitContext *gb,
+ int channel_idx, int first_in_pkt)
+{
+ static const int mode_map[2][4] = { { 0, 1, 2, 3 }, { 0, 2, 3, 4 } };
+ const int mode = mode_map[channel_idx][get_bits(gb, 2)];
+
+ memset(c->scalefactors, 0, sizeof(c->scalefactors));
+
+ if (first_in_pkt && (mode == 4 || ((mode == 3) && !channel_idx))) {
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid scalefactor coding mode!\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ switch (mode) {
+ case 0: { /* VLC delta offset */
+ const uint8_t *sf_weights = at9_tab_sf_weights[get_bits(gb, 3)];
+ const int base = get_bits(gb, 5);
+ const int len = get_bits(gb, 2) + 3;
+ const VLC *tab = &s->sf_vlc[0][len];
+
+ c->scalefactors[0] = get_bits(gb, len);
+
+ for (int i = 1; i < b->band_ext_q_unit; i++) {
+ int val = c->scalefactors[i - 1] + get_vlc2(gb, tab->table, 9, 2);
+ c->scalefactors[i] = val & ((1 << len) - 1);
+ }
+
+ for (int i = 0; i < b->band_ext_q_unit; i++)
+ c->scalefactors[i] += base - sf_weights[i];
+
+ break;
+ }
+ case 1: { /* CLC offset */
+ const int len = get_bits(gb, 2) + 2;
+ const int base = len < 5 ? get_bits(gb, 5) : 0;
+ for (int i = 0; i < b->band_ext_q_unit; i++)
+ c->scalefactors[i] = base + get_bits(gb, len);
+ break;
+ }
+ case 2:
+ case 4: { /* VLC dist to baseline */
+ const int *baseline = mode == 4 ? c->scalefactors_prev :
+ channel_idx ? b->channel[0].scalefactors :
+ c->scalefactors_prev;
+ const int baseline_len = mode == 4 ? b->q_unit_cnt_prev :
+ channel_idx ? b->band_ext_q_unit :
+ b->q_unit_cnt_prev;
+
+ const int len = get_bits(gb, 2) + 2;
+ const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
+ const VLC *tab = &s->sf_vlc[1][len];
+
+ for (int i = 0; i < unit_cnt; i++) {
+ int dist = get_vlc2(gb, tab->table, 9, 2);
+ c->scalefactors[i] = baseline[i] + dist;
+ }
+
+ for (int i = unit_cnt; i < b->band_ext_q_unit; i++)
+ c->scalefactors[i] = get_bits(gb, 5);
+
+ break;
+ }
+ case 3: { /* VLC offset with baseline */
+ const int *baseline = channel_idx ? b->channel[0].scalefactors :
+ c->scalefactors_prev;
+ const int baseline_len = channel_idx ? b->band_ext_q_unit :
+ b->q_unit_cnt_prev;
+
+ const int base = get_bits(gb, 5) - (1 << (5 - 1));
+ const int len = get_bits(gb, 2) + 1;
+ const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
+ const VLC *tab = &s->sf_vlc[0][len];
+
+ c->scalefactors[0] = get_bits(gb, len);
+
+ for (int i = 1; i < unit_cnt; i++) {
+ int val = c->scalefactors[i - 1] + get_vlc2(gb, tab->table, 9, 2);
+ c->scalefactors[i] = val & ((1 << len) - 1);
+ }
+
+ for (int i = 0; i < unit_cnt; i++)
+ c->scalefactors[i] += base + baseline[i];
+
+ for (int i = unit_cnt; i < b->band_ext_q_unit; i++)
+ c->scalefactors[i] = get_bits(gb, 5);
+ break;
+ }
+ }
+
+ for (int i = 0; i < b->band_ext_q_unit; i++)
+ if (c->scalefactors[i] < 0 || c->scalefactors[i] > 31)
+ return AVERROR_INVALIDDATA;
+
+ memcpy(c->scalefactors_prev, c->scalefactors, sizeof(c->scalefactors));
+
+ return 0;
+}
+
+static inline void calc_codebook_idx(ATRAC9Context *s, ATRAC9BlockData *b,
+ ATRAC9ChannelData *c)
+{
+ int avg = 0;
+ const int last_sf = c->scalefactors[c->q_unit_cnt];
+
+ memset(c->codebookset, 0, sizeof(c->codebookset));
+
+ if (c->q_unit_cnt <= 1)
+ return;
+ if (s->samplerate_idx > 7)
+ return;
+
+ c->scalefactors[c->q_unit_cnt] = c->scalefactors[c->q_unit_cnt - 1];
+
+ if (c->q_unit_cnt > 12) {
+ for (int i = 0; i < 12; i++)
+ avg += c->scalefactors[i];
+ avg = (avg + 6) / 12;
+ }
+
+ for (int i = 8; i < c->q_unit_cnt; i++) {
+ const int prev = c->scalefactors[i - 1];
+ const int cur = c->scalefactors[i ];
+ const int next = c->scalefactors[i + 1];
+ const int min = FFMIN(prev, next);
+ if ((cur - min >= 3 || 2*cur - prev - next >= 3))
+ c->codebookset[i] = 1;
+ }
+
+
+ for (int i = 12; i < c->q_unit_cnt; i++) {
+ const int cur = c->scalefactors[i];
+ const int cnd = at9_q_unit_to_coeff_cnt[i] == 16;
+ const int min = FFMIN(c->scalefactors[i + 1], c->scalefactors[i - 1]);
+ if (c->codebookset[i])
+ continue;
+
+ c->codebookset[i] = (((cur - min) >= 2) && (cur >= (avg - cnd)));
+ }
+
+ c->scalefactors[c->q_unit_cnt] = last_sf;
+}
+
+static inline void read_coeffs_coarse(ATRAC9Context *s, ATRAC9BlockData *b,
+ ATRAC9ChannelData *c, GetBitContext *gb)
+{
+ const int max_prec = s->samplerate_idx > 7 ? 1 : 7;
+
+ memset(c->q_coeffs_coarse, 0, sizeof(c->q_coeffs_coarse));
+
+ for (int i = 0; i < c->q_unit_cnt; i++) {
+ int *coeffs = &c->q_coeffs_coarse[at9_q_unit_to_coeff_idx[i]];
+ const int bands = at9_q_unit_to_coeff_cnt[i];
+ const int prec = c->precision_coarse[i] + 1;
+
+ if (prec <= max_prec) {
+ const int cb = c->codebookset[i];
+ const int cbi = at9_q_unit_to_codebookidx[i];
+ const VLC *tab = &s->coeff_vlc[cb][prec][cbi];
+ const HuffmanCodebook *huff = &at9_huffman_coeffs[cb][prec][cbi];
+ const int groups = bands >> huff->value_cnt_pow;
+
+ for (int j = 0; j < groups; j++) {
+ uint16_t val = get_vlc2(gb, tab->table, 9, huff->max_bit_size);
+
+ for (int k = 0; k < huff->value_cnt; k++) {
+ coeffs[k] = sign_extend(val, huff->value_bits);
+ val >>= huff->value_bits;
+ }
+
+ coeffs += huff->value_cnt;
+ }
+ } else {
+ for (int j = 0; j < bands; j++)
+ coeffs[j] = sign_extend(get_bits(gb, prec), prec);
+ }
+ }
+}
+
+static inline void read_coeffs_fine(ATRAC9Context *s, ATRAC9BlockData *b,
+ ATRAC9ChannelData *c, GetBitContext *gb)
+{
+ memset(c->q_coeffs_fine, 0, sizeof(c->q_coeffs_fine));
+
+ for (int i = 0; i < c->q_unit_cnt; i++) {
+ const int start = at9_q_unit_to_coeff_idx[i + 0];
+ const int end = at9_q_unit_to_coeff_idx[i + 1];
+ const int len = c->precision_fine[i] + 1;
+
+ if (c->precision_fine[i] <= 0)
+ continue;
+
+ for (int j = start; j < end; j++)
+ c->q_coeffs_fine[j] = sign_extend(get_bits(gb, len), len);
+ }
+}
+
+static inline void dequantize(ATRAC9Context *s, ATRAC9BlockData *b,
+ ATRAC9ChannelData *c)
+{
+ memset(c->coeffs, 0, sizeof(c->coeffs));
+
+ for (int i = 0; i < c->q_unit_cnt; i++) {
+ const int start = at9_q_unit_to_coeff_idx[i + 0];
+ const int end = at9_q_unit_to_coeff_idx[i + 1];
+
+ const float coarse_c = at9_quant_step_coarse[c->precision_coarse[i]];
+ const float fine_c = at9_quant_step_fine[c->precision_fine[i]];
+
+ for (int j = start; j < end; j++) {
+ const float vc = c->q_coeffs_coarse[j] * coarse_c;
+ const float vf = c->q_coeffs_fine[j] * fine_c;
+ c->coeffs[j] = vc + vf;
+ }
+ }
+}
+
+static inline void apply_intensity_stereo(ATRAC9Context *s, ATRAC9BlockData *b,
+ const int stereo)
+{
+ float *src = b->channel[ b->cpe_base_channel].coeffs;
+ float *dst = b->channel[!b->cpe_base_channel].coeffs;
+
+ if (!stereo)
+ return;
+
+ if (b->q_unit_cnt <= b->stereo_q_unit)
+ return;
+
+ for (int i = b->stereo_q_unit; i < b->q_unit_cnt; i++) {
+ const int sign = b->is_signs[i];
+ const int start = at9_q_unit_to_coeff_idx[i + 0];
+ const int end = at9_q_unit_to_coeff_idx[i + 1];
+ for (int j = start; j < end; j++)
+ dst[j] = sign*src[j];
+ }
+}
+
+static inline void apply_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
+ const int stereo)
+{
+ for (int i = 0; i <= stereo; i++) {
+ float *coeffs = b->channel[i].coeffs;
+ for (int j = 0; j < b->q_unit_cnt; j++) {
+ const int start = at9_q_unit_to_coeff_idx[j + 0];
+ const int end = at9_q_unit_to_coeff_idx[j + 1];
+ const int scalefactor = b->channel[i].scalefactors[j];
+ const float scale = at9_scalefactor_c[scalefactor];
+ for (int k = start; k < end; k++)
+ coeffs[k] *= scale;
+ }
+ }
+}
+
+static inline void fill_with_noise(ATRAC9Context *s, ATRAC9ChannelData *c,
+ int start, int count)
+{
+ float maxval = 0.0f;
+ for (int i = 0; i < count; i += 2) {
+ double tmp[2];
+ av_bmg_get(&s->lfg, tmp);
+ c->coeffs[start + i + 0] = tmp[0];
+ c->coeffs[start + i + 1] = tmp[1];
+ maxval = FFMAX(FFMAX(FFABS(tmp[0]), FFABS(tmp[1])), maxval);
+ }
+ /* Normalize */
+ for (int i = 0; i < count; i++)
+ c->coeffs[start + i] /= maxval;
+}
+
+static inline void scale_band_ext_coeffs(ATRAC9ChannelData *c, float sf[6],
+ const int s_unit, const int e_unit)
+{
+ for (int i = s_unit; i < e_unit; i++) {
+ const int start = at9_q_unit_to_coeff_idx[i + 0];
+ const int end = at9_q_unit_to_coeff_idx[i + 1];
+ for (int j = start; j < end; j++)
+ c->coeffs[j] *= sf[i - s_unit];
+ }
+}
+
+static inline void apply_band_extension(ATRAC9Context *s, ATRAC9BlockData *b,
+ const int stereo)
+{
+ const int g_units[4] = { /* A, B, C, total units */
+ b->q_unit_cnt,
+ at9_tab_band_ext_group[b->q_unit_cnt - 13][0],
+ at9_tab_band_ext_group[b->q_unit_cnt - 13][1],
+ FFMAX(g_units[2], 22),
+ };
+
+ const int g_bins[4] = { /* A, B, C, total bins */
+ at9_q_unit_to_coeff_idx[g_units[0]],
+ at9_q_unit_to_coeff_idx[g_units[1]],
+ at9_q_unit_to_coeff_idx[g_units[2]],
+ at9_q_unit_to_coeff_idx[g_units[3]],
+ };
+
+ if (!b->has_band_ext || !b->has_band_ext_data)
+ return;
+
+ for (int ch = 0; ch <= stereo; ch++) {
+ ATRAC9ChannelData *c = &b->channel[ch];
+
+ /* Mirror the spectrum */
+ for (int i = 0; i < 3; i++)
+ for (int j = 0; j < (g_bins[i + 1] - g_bins[i + 0]); j++)
+ c->coeffs[g_bins[i] + j] = c->coeffs[g_bins[i] - j - 1];
+
+ switch (c->band_ext) {
+ case 0: {
+ float sf[6] = { 0.0f };
+ const int l = g_units[3] - g_units[0] - 1;
+ const int n_start = at9_q_unit_to_coeff_idx[g_units[3] - 1];
+ const int n_cnt = at9_q_unit_to_coeff_cnt[g_units[3] - 1];
+ switch (at9_tab_band_ext_group[b->q_unit_cnt - 13][2]) {
+ case 3:
+ sf[0] = at9_band_ext_scales_m0[0][0][c->band_ext_data[0]];
+ sf[1] = at9_band_ext_scales_m0[0][1][c->band_ext_data[0]];
+ sf[2] = at9_band_ext_scales_m0[0][2][c->band_ext_data[1]];
+ sf[3] = at9_band_ext_scales_m0[0][3][c->band_ext_data[2]];
+ sf[4] = at9_band_ext_scales_m0[0][4][c->band_ext_data[3]];
+ break;
+ case 4:
+ sf[0] = at9_band_ext_scales_m0[1][0][c->band_ext_data[0]];
+ sf[1] = at9_band_ext_scales_m0[1][1][c->band_ext_data[0]];
+ sf[2] = at9_band_ext_scales_m0[1][2][c->band_ext_data[1]];
+ sf[3] = at9_band_ext_scales_m0[1][3][c->band_ext_data[2]];
+ sf[4] = at9_band_ext_scales_m0[1][4][c->band_ext_data[3]];
+ break;
+ case 5:
+ sf[0] = at9_band_ext_scales_m0[2][0][c->band_ext_data[0]];
+ sf[1] = at9_band_ext_scales_m0[2][1][c->band_ext_data[1]];
+ sf[2] = at9_band_ext_scales_m0[2][2][c->band_ext_data[1]];
+ break;
+ }
+
+ sf[l] = at9_scalefactor_c[c->scalefactors[g_units[0]]];
+
+ fill_with_noise(s, c, n_start, n_cnt);
+ scale_band_ext_coeffs(c, sf, g_units[0], g_units[3]);
+ break;
+ }
+ case 1: {
+ float sf[6];
+ for (int i = g_units[0]; i < g_units[3]; i++)
+ sf[i - g_units[0]] = at9_scalefactor_c[c->scalefactors[i]];
+
+ fill_with_noise(s, c, g_bins[0], g_bins[3] - g_bins[0]);
+ scale_band_ext_coeffs(c, sf, g_units[0], g_units[3]);
+ break;
+ }
+ case 2: {
+ const float g_sf[2] = {
+ at9_band_ext_scales_m2[c->band_ext_data[0]],
+ at9_band_ext_scales_m2[c->band_ext_data[1]],
+ };
+
+ for (int i = 0; i < 2; i++)
+ for (int j = g_bins[i + 0]; j < g_bins[i + 1]; j++)
+ c->coeffs[j] *= g_sf[i];
+ break;
+ }
+ case 3: {
+ float scale = at9_band_ext_scales_m3[c->band_ext_data[0]][0];
+ float rate = at9_band_ext_scales_m3[c->band_ext_data[1]][1];
+ rate = pow(2, rate);
+ for (int i = g_bins[0]; i < g_bins[3]; i++) {
+ scale *= rate;
+ c->coeffs[i] *= scale;
+ }
+ break;
+ }
+ case 4: {
+ const float m = at9_band_ext_scales_m4[c->band_ext_data[0]];
+ const float g_sf[3] = { 0.7079468f*m, 0.5011902f*m, 0.3548279f*m };
+
+ for (int i = 0; i < 3; i++)
+ for (int j = g_bins[i + 0]; j < g_bins[i + 1]; j++)
+ c->coeffs[j] *= g_sf[i];
+ break;
+ }
+ }
+ }
+}
+
+static int atrac9_decode_block(ATRAC9Context *s, GetBitContext *gb,
+ ATRAC9BlockData *b, AVFrame *frame,
+ int frame_idx, int block_idx)
+{
+ const int first_in_pkt = !get_bits1(gb);
+ const int reuse_params = get_bits1(gb);
+ const int stereo = s->block_config->type[block_idx] == ATRAC9_BLOCK_TYPE_CPE;
+
+ if (s->block_config->type[block_idx] == ATRAC9_BLOCK_TYPE_LFE) {
+ ATRAC9ChannelData *c = &b->channel[0];
+ const int precision = reuse_params ? 8 : 4;
+ c->q_unit_cnt = b->q_unit_cnt = 2;
+
+ memset(c->scalefactors, 0, sizeof(c->scalefactors));
+ memset(c->q_coeffs_fine, 0, sizeof(c->q_coeffs_fine));
+ memset(c->q_coeffs_coarse, 0, sizeof(c->q_coeffs_coarse));
+
+ for (int i = 0; i < b->q_unit_cnt; i++) {
+ c->scalefactors[i] = get_bits(gb, 5);
+ c->precision_coarse[i] = precision;
+ c->precision_fine[i] = 0;
+ }
+
+ for (int i = 0; i < c->q_unit_cnt; i++) {
+ const int start = at9_q_unit_to_coeff_idx[i + 0];
+ const int end = at9_q_unit_to_coeff_idx[i + 1];
+ for (int j = start; j < end; j++)
+ c->q_coeffs_coarse[j] = get_bits(gb, c->precision_coarse[i] + 1);
+ }
+
+ dequantize (s, b, c);
+ apply_scalefactors(s, b, 0);
+
+ goto imdct;
+ }
+
+ if (first_in_pkt && reuse_params) {
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid block flags!\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* Band parameters */
+ if (!reuse_params) {
+ int stereo_band, ext_band;
+ const int min_band_count = s->samplerate_idx > 7 ? 1 : 3;
+ b->band_count = get_bits(gb, 4) + min_band_count;
+ b->q_unit_cnt = at9_tab_band_q_unit_map[b->band_count];
+
+ b->band_ext_q_unit = b->stereo_q_unit = b->q_unit_cnt;
+
+ if (b->band_count > at9_tab_sri_max_bands[s->samplerate_idx]) {
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid band count %i!\n",
+ b->band_count);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (stereo) {
+ stereo_band = get_bits(gb, 4) + min_band_count;
+ if (stereo_band > b->band_count) {
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid stereo band %i!\n",
+ stereo_band);
+ return AVERROR_INVALIDDATA;
+ }
+ b->stereo_q_unit = at9_tab_band_q_unit_map[stereo_band];
+ }
+
+ b->has_band_ext = get_bits1(gb);
+ if (b->has_band_ext) {
+ ext_band = get_bits(gb, 4) + min_band_count;
+ if (ext_band < b->band_count) {
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid extension band %i!\n",
+ ext_band);
+ return AVERROR_INVALIDDATA;
+ }
+ b->band_ext_q_unit = at9_tab_band_q_unit_map[ext_band];
+ }
+ }
+
+ /* Calculate bit alloc gradient */
+ if (parse_gradient(s, b, gb))
+ return AVERROR_INVALIDDATA;
+
+ /* IS data */
+ b->cpe_base_channel = 0;
+ if (stereo) {
+ b->cpe_base_channel = get_bits1(gb);
+ if (get_bits1(gb)) {
+ for (int i = b->stereo_q_unit; i < b->q_unit_cnt; i++)
+ b->is_signs[i] = 1 - 2*get_bits1(gb);
+ } else {
+ for (int i = 0; i < FF_ARRAY_ELEMS(b->is_signs); i++)
+ b->is_signs[i] = 1;
+ }
+ }
+
+ /* Band extension */
+ if (parse_band_ext(s, b, gb, stereo))
+ return AVERROR_INVALIDDATA;
+
+ /* Scalefactors */
+ for (int i = 0; i <= stereo; i++) {
+ ATRAC9ChannelData *c = &b->channel[i];
+ c->q_unit_cnt = i == b->cpe_base_channel ? b->q_unit_cnt :
+ b->stereo_q_unit;
+ if (read_scalefactors(s, b, c, gb, i, first_in_pkt))
+ return AVERROR_INVALIDDATA;
+
+ calc_precision (s, b, c);
+ calc_codebook_idx (s, b, c);
+ read_coeffs_coarse(s, b, c, gb);
+ read_coeffs_fine (s, b, c, gb);
+ dequantize (s, b, c);
+ }
+
+ b->q_unit_cnt_prev = b->has_band_ext ? b->band_ext_q_unit : b->q_unit_cnt;
+
+ apply_intensity_stereo(s, b, stereo);
+ apply_scalefactors (s, b, stereo);
+ apply_band_extension (s, b, stereo);
+
+imdct:
+ for (int i = 0; i <= stereo; i++) {
+ ATRAC9ChannelData *c = &b->channel[i];
+ const int dst_idx = s->block_config->plane_map[block_idx][i];
+ const int wsize = 1 << s->frame_log2;
+ const ptrdiff_t offset = wsize*frame_idx*sizeof(float);
+ float *dst = (float *)(frame->extended_data[dst_idx] + offset);
+
+ s->imdct.imdct_half(&s->imdct, s->temp, c->coeffs);
+ s->fdsp->vector_fmul_window(dst, c->prev_win, s->temp,
+ s->imdct_win, wsize >> 1);
+ memcpy(c->prev_win, s->temp + (wsize >> 1), sizeof(float)*wsize >> 1);
+ }
+
+ return 0;
+}
+
+static int atrac9_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
+{
+ int ret;
+ GetBitContext gb;
+ AVFrame *frame = data;
+ ATRAC9Context *s = avctx->priv_data;
+ const int frames = FFMIN(avpkt->size / s->avg_frame_size, s->frame_count);
+
+ frame->nb_samples = (1 << s->frame_log2) * frames;
+ ret = ff_get_buffer(avctx, frame, 0);
+ if (ret < 0)
+ return ret;
+
+ init_get_bits8(&gb, avpkt->data, avpkt->size);
+
+ for (int i = 0; i < frames; i++) {
+ for (int j = 0; j < s->block_config->count; j++) {
+ ret = atrac9_decode_block(s, &gb, &s->block[j], frame, i, j);
+ if (ret)
+ return ret;
+ align_get_bits(&gb);
+ }
+ }
+
+ *got_frame_ptr = 1;
+
+ return avctx->block_align;
+}
+
+static void atrac9_decode_flush(AVCodecContext *avctx)
+{
+ ATRAC9Context *s = avctx->priv_data;
+
+ for (int j = 0; j < s->block_config->count; j++) {
+ ATRAC9BlockData *b = &s->block[j];
+ const int stereo = s->block_config->type[j] == ATRAC9_BLOCK_TYPE_CPE;
+ for (int i = 0; i <= stereo; i++) {
+ ATRAC9ChannelData *c = &b->channel[i];
+ memset(c->prev_win, 0, sizeof(c->prev_win));
+ }
+ }
+}
+
+static av_cold int atrac9_decode_close(AVCodecContext *avctx)
+{
+ ATRAC9Context *s = avctx->priv_data;
+
+ for (int i = 1; i < 7; i++)
+ ff_free_vlc(&s->sf_vlc[0][i]);
+ for (int i = 2; i < 6; i++)
+ ff_free_vlc(&s->sf_vlc[1][i]);
+ for (int i = 0; i < 2; i++)
+ for (int j = 0; j < 8; j++)
+ for (int k = 0; k < 4; k++)
+ ff_free_vlc(&s->coeff_vlc[i][j][k]);
+
+ ff_mdct_end(&s->imdct);
+ av_free(s->fdsp);
+
+ return 0;
+}
+
+static av_cold int atrac9_decode_init(AVCodecContext *avctx)
+{
+ GetBitContext gb;
+ ATRAC9Context *s = avctx->priv_data;
+ int version, block_config_idx, superframe_idx, alloc_c_len;
+
+ s->avctx = avctx;
+
+ av_lfg_init(&s->lfg, 0xFBADF00D);
+
+ if (avctx->extradata_size != 12) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid extradata length!\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ version = AV_RL32(avctx->extradata);
+ if (version > 2) {
+ av_log(avctx, AV_LOG_ERROR, "Unsupported version (%i)!\n", version);
+ return AVERROR_INVALIDDATA;
+ }
+
+ init_get_bits8(&gb, avctx->extradata + 4, avctx->extradata_size);
+
+ if (get_bits(&gb, 8) != 0xFE) {
+ av_log(avctx, AV_LOG_ERROR, "Incorrect magic byte!\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ s->samplerate_idx = get_bits(&gb, 4);
+ avctx->sample_rate = at9_tab_samplerates[s->samplerate_idx];
+
+ block_config_idx = get_bits(&gb, 3);
+ if (block_config_idx > 5) {
+ av_log(avctx, AV_LOG_ERROR, "Incorrect block config!\n");
+ return AVERROR_INVALIDDATA;
+ }
+ s->block_config = &at9_block_layout[block_config_idx];
+
+ avctx->channel_layout = s->block_config->channel_layout;
+ avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
+
+ if (get_bits1(&gb)) {
+ av_log(avctx, AV_LOG_ERROR, "Incorrect verification bit!\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* Average frame size in bytes */
+ s->avg_frame_size = get_bits(&gb, 11) + 1;
+
+ superframe_idx = get_bits(&gb, 2);
+ if (superframe_idx & 1) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid superframe index!\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ s->frame_count = 1 << superframe_idx;
+ s->frame_log2 = at9_tab_sri_frame_log2[s->samplerate_idx];
+
+ if (ff_mdct_init(&s->imdct, s->frame_log2 + 1, 1, 1.0f / 32768.0f))
+ return AVERROR(ENOMEM);
+
+ s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
+ if (!s->fdsp)
+ return AVERROR(ENOMEM);
+
+ /* iMDCT window */
+ for (int i = 0; i < (1 << s->frame_log2); i++) {
+ const int len = 1 << s->frame_log2;
+ const float sidx = ( i + 0.5f) / len;
+ const float eidx = (len - i - 0.5f) / len;
+ const float s_c = sinf(sidx*M_PI - M_PI_2)*0.5f + 0.5f;
+ const float e_c = sinf(eidx*M_PI - M_PI_2)*0.5f + 0.5f;
+ s->imdct_win[i] = s_c / ((s_c * s_c) + (e_c * e_c));
+ }
+
+ /* Allocation curve */
+ alloc_c_len = FF_ARRAY_ELEMS(at9_tab_b_dist);
+ for (int i = 1; i <= alloc_c_len; i++)
+ for (int j = 0; j < i; j++)
+ s->alloc_curve[i - 1][j] = at9_tab_b_dist[(j * alloc_c_len) / i];
+
+ /* Unsigned scalefactor VLCs */
+ for (int i = 1; i < 7; i++) {
+ const HuffmanCodebook *hf = &at9_huffman_sf_unsigned[i];
+
+ init_vlc(&s->sf_vlc[0][i], 9, hf->size, hf->bits, 1, 1, hf->codes,
+ 2, 2, 0);
+ }
+
+ /* Signed scalefactor VLCs */
+ for (int i = 2; i < 6; i++) {
+ const HuffmanCodebook *hf = &at9_huffman_sf_signed[i];
+
+ int nums = hf->size;
+ int16_t sym[32];
+ for (int j = 0; j < nums; j++)
+ sym[j] = sign_extend(j, hf->value_bits);
+
+ ff_init_vlc_sparse(&s->sf_vlc[1][i], 9, hf->size, hf->bits, 1, 1,
+ hf->codes, 2, 2, sym, sizeof(*sym), sizeof(*sym), 0);
+ }
+
+ /* Coefficient VLCs */
+ for (int i = 0; i < 2; i++) {
+ for (int j = 0; j < 8; j++) {
+ for (int k = 0; k < 4; k++) {
+ const HuffmanCodebook *hf = &at9_huffman_coeffs[i][j][k];
+ init_vlc(&s->coeff_vlc[i][j][k], 9, hf->size, hf->bits, 1, 1,
+ hf->codes, 2, 2, 0);
+ }
+ }
+ }
+
+ return 0;
+}
+
+AVCodec ff_atrac9_decoder = {
+ .name = "atrac9",
+ .long_name = NULL_IF_CONFIG_SMALL("ATRAC9 (Adaptive TRansform Acoustic Coding 9)"),
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_ATRAC9,
+ .priv_data_size = sizeof(ATRAC9Context),
+ .init = atrac9_decode_init,
+ .close = atrac9_decode_close,
+ .decode = atrac9_decode_frame,
+ .flush = atrac9_decode_flush,
+ .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
+ .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-14 18:57:23 +0000