/*
* Copyright (c) 2012 Andrew D'Addesio
* Copyright (c) 2013-2014 Mozilla Corporation
- * Copyright (c) 2016 Rostislav Pehlivanov <atomnuker@gmail.com>
*
* This file is part of FFmpeg.
*
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-/**
- * @file
- * Opus CELT decoder
- */
+#include <stdint.h>
#include "opus_celt.h"
-#include "opustab.h"
#include "opus_pvq.h"
+#include "opustab.h"
-/* Use the 2D z-transform to apply prediction in both the time domain (alpha)
- * and the frequency domain (beta) */
-static void celt_decode_coarse_energy(CeltFrame *f, OpusRangeCoder *rc)
+void ff_celt_quant_bands(CeltFrame *f, OpusRangeCoder *rc)
{
- int i, j;
- float prev[2] = { 0 };
- float alpha = ff_celt_alpha_coef[f->size];
- float beta = ff_celt_beta_coef[f->size];
- const uint8_t *model = ff_celt_coarse_energy_dist[f->size][0];
-
- /* intra frame */
- if (opus_rc_tell(rc) + 3 <= f->framebits && ff_opus_rc_dec_log(rc, 3)) {
- alpha = 0.0f;
- beta = 1.0f - (4915.0f/32768.0f);
- model = ff_celt_coarse_energy_dist[f->size][1];
- }
+ float lowband_scratch[8 * 22];
+ float norm1[2 * 8 * 100];
+ float *norm2 = norm1 + 8 * 100;
- for (i = 0; i < CELT_MAX_BANDS; i++) {
- for (j = 0; j < f->channels; j++) {
- CeltBlock *block = &f->block[j];
- float value;
- int available;
+ int totalbits = (f->framebits << 3) - f->anticollapse_needed;
- if (i < f->start_band || i >= f->end_band) {
- block->energy[i] = 0.0;
- continue;
- }
+ int update_lowband = 1;
+ int lowband_offset = 0;
- available = f->framebits - opus_rc_tell(rc);
- if (available >= 15) {
- /* decode using a Laplace distribution */
- int k = FFMIN(i, 20) << 1;
- value = ff_opus_rc_dec_laplace(rc, model[k] << 7, model[k+1] << 6);
- } else if (available >= 2) {
- int x = ff_opus_rc_dec_cdf(rc, ff_celt_model_energy_small);
- value = (x>>1) ^ -(x&1);
- } else if (available >= 1) {
- value = -(float)ff_opus_rc_dec_log(rc, 1);
- } else value = -1;
-
- block->energy[i] = FFMAX(-9.0f, block->energy[i]) * alpha + prev[j] + value;
- prev[j] += beta * value;
- }
- }
-}
+ int i, j;
-static void celt_decode_fine_energy(CeltFrame *f, OpusRangeCoder *rc)
-{
- int i;
for (i = f->start_band; i < f->end_band; i++) {
- int j;
- if (!f->fine_bits[i])
- continue;
-
- for (j = 0; j < f->channels; j++) {
- CeltBlock *block = &f->block[j];
- int q2;
- float offset;
- q2 = ff_opus_rc_get_raw(rc, f->fine_bits[i]);
- offset = (q2 + 0.5f) * (1 << (14 - f->fine_bits[i])) / 16384.0f - 0.5f;
- block->energy[i] += offset;
+ uint32_t cm[2] = { (1 << f->blocks) - 1, (1 << f->blocks) - 1 };
+ int band_offset = ff_celt_freq_bands[i] << f->size;
+ int band_size = ff_celt_freq_range[i] << f->size;
+ float *X = f->block[0].coeffs + band_offset;
+ float *Y = (f->channels == 2) ? f->block[1].coeffs + band_offset : NULL;
+ float *norm_loc1, *norm_loc2;
+
+ int consumed = opus_rc_tell_frac(rc);
+ int effective_lowband = -1;
+ int b = 0;
+
+ /* Compute how many bits we want to allocate to this band */
+ if (i != f->start_band)
+ f->remaining -= consumed;
+ f->remaining2 = totalbits - consumed - 1;
+ if (i <= f->coded_bands - 1) {
+ int curr_balance = f->remaining / FFMIN(3, f->coded_bands-i);
+ b = av_clip_uintp2(FFMIN(f->remaining2 + 1, f->pulses[i] + curr_balance), 14);
}
- }
-}
-static void celt_decode_final_energy(CeltFrame *f, OpusRangeCoder *rc)
-{
- int priority, i, j;
- int bits_left = f->framebits - opus_rc_tell(rc);
-
- for (priority = 0; priority < 2; priority++) {
- for (i = f->start_band; i < f->end_band && bits_left >= f->channels; i++) {
- if (f->fine_priority[i] != priority || f->fine_bits[i] >= CELT_MAX_FINE_BITS)
- continue;
-
- for (j = 0; j < f->channels; j++) {
- int q2;
- float offset;
- q2 = ff_opus_rc_get_raw(rc, 1);
- offset = (q2 - 0.5f) * (1 << (14 - f->fine_bits[i] - 1)) / 16384.0f;
- f->block[j].energy[i] += offset;
- bits_left--;
- }
- }
- }
-}
+ if ((ff_celt_freq_bands[i] - ff_celt_freq_range[i] >= ff_celt_freq_bands[f->start_band] ||
+ i == f->start_band + 1) && (update_lowband || lowband_offset == 0))
+ lowband_offset = i;
-static void celt_decode_tf_changes(CeltFrame *f, OpusRangeCoder *rc)
-{
- int i, diff = 0, tf_select = 0, tf_changed = 0, tf_select_bit;
- int consumed, bits = f->transient ? 2 : 4;
+ if (i == f->start_band + 1) {
+ /* Special Hybrid Folding (RFC 8251 section 9). Copy the first band into
+ the second to ensure the second band never has to use the LCG. */
+ int count = (ff_celt_freq_range[i] - ff_celt_freq_range[i-1]) << f->size;
- consumed = opus_rc_tell(rc);
- tf_select_bit = (f->size != 0 && consumed+bits+1 <= f->framebits);
+ memcpy(&norm1[band_offset], &norm1[band_offset - count], count * sizeof(float));
- for (i = f->start_band; i < f->end_band; i++) {
- if (consumed+bits+tf_select_bit <= f->framebits) {
- diff ^= ff_opus_rc_dec_log(rc, bits);
- consumed = opus_rc_tell(rc);
- tf_changed |= diff;
+ if (f->channels == 2)
+ memcpy(&norm2[band_offset], &norm2[band_offset - count], count * sizeof(float));
}
- f->tf_change[i] = diff;
- bits = f->transient ? 4 : 5;
- }
- if (tf_select_bit && ff_celt_tf_select[f->size][f->transient][0][tf_changed] !=
- ff_celt_tf_select[f->size][f->transient][1][tf_changed])
- tf_select = ff_opus_rc_dec_log(rc, 1);
+ /* Get a conservative estimate of the collapse_mask's for the bands we're
+ going to be folding from. */
+ if (lowband_offset != 0 && (f->spread != CELT_SPREAD_AGGRESSIVE ||
+ f->blocks > 1 || f->tf_change[i] < 0)) {
+ int foldstart, foldend;
+
+ /* This ensures we never repeat spectral content within one band */
+ effective_lowband = FFMAX(ff_celt_freq_bands[f->start_band],
+ ff_celt_freq_bands[lowband_offset] - ff_celt_freq_range[i]);
+ foldstart = lowband_offset;
+ while (ff_celt_freq_bands[--foldstart] > effective_lowband);
+ foldend = lowband_offset - 1;
+ while (++foldend < i && ff_celt_freq_bands[foldend] < effective_lowband + ff_celt_freq_range[i]);
+
+ cm[0] = cm[1] = 0;
+ for (j = foldstart; j < foldend; j++) {
+ cm[0] |= f->block[0].collapse_masks[j];
+ cm[1] |= f->block[f->channels - 1].collapse_masks[j];
+ }
+ }
- for (i = f->start_band; i < f->end_band; i++) {
- f->tf_change[i] = ff_celt_tf_select[f->size][f->transient][tf_select][f->tf_change[i]];
- }
-}
+ if (f->dual_stereo && i == f->intensity_stereo) {
+ /* Switch off dual stereo to do intensity */
+ f->dual_stereo = 0;
+ for (j = ff_celt_freq_bands[f->start_band] << f->size; j < band_offset; j++)
+ norm1[j] = (norm1[j] + norm2[j]) / 2;
+ }
-static void celt_denormalize(CeltFrame *f, CeltBlock *block, float *data)
-{
- int i, j;
+ norm_loc1 = effective_lowband != -1 ? norm1 + (effective_lowband << f->size) : NULL;
+ norm_loc2 = effective_lowband != -1 ? norm2 + (effective_lowband << f->size) : NULL;
- for (i = f->start_band; i < f->end_band; i++) {
- float *dst = data + (ff_celt_freq_bands[i] << f->size);
- float log_norm = block->energy[i] + ff_celt_mean_energy[i];
- float norm = exp2f(FFMIN(log_norm, 32.0f));
+ if (f->dual_stereo) {
+ cm[0] = f->pvq->quant_band(f->pvq, f, rc, i, X, NULL, band_size, b >> 1,
+ f->blocks, norm_loc1, f->size,
+ norm1 + band_offset, 0, 1.0f,
+ lowband_scratch, cm[0]);
- for (j = 0; j < ff_celt_freq_range[i] << f->size; j++)
- dst[j] *= norm;
- }
-}
+ cm[1] = f->pvq->quant_band(f->pvq, f, rc, i, Y, NULL, band_size, b >> 1,
+ f->blocks, norm_loc2, f->size,
+ norm2 + band_offset, 0, 1.0f,
+ lowband_scratch, cm[1]);
+ } else {
+ cm[0] = f->pvq->quant_band(f->pvq, f, rc, i, X, Y, band_size, b >> 0,
+ f->blocks, norm_loc1, f->size,
+ norm1 + band_offset, 0, 1.0f,
+ lowband_scratch, cm[0] | cm[1]);
+ cm[1] = cm[0];
+ }
-static void celt_postfilter_apply_transition(CeltBlock *block, float *data)
-{
- const int T0 = block->pf_period_old;
- const int T1 = block->pf_period;
-
- float g00, g01, g02;
- float g10, g11, g12;
-
- float x0, x1, x2, x3, x4;
-
- int i;
-
- if (block->pf_gains[0] == 0.0 &&
- block->pf_gains_old[0] == 0.0)
- return;
-
- g00 = block->pf_gains_old[0];
- g01 = block->pf_gains_old[1];
- g02 = block->pf_gains_old[2];
- g10 = block->pf_gains[0];
- g11 = block->pf_gains[1];
- g12 = block->pf_gains[2];
-
- x1 = data[-T1 + 1];
- x2 = data[-T1];
- x3 = data[-T1 - 1];
- x4 = data[-T1 - 2];
-
- for (i = 0; i < CELT_OVERLAP; i++) {
- float w = ff_celt_window2[i];
- x0 = data[i - T1 + 2];
-
- data[i] += (1.0 - w) * g00 * data[i - T0] +
- (1.0 - w) * g01 * (data[i - T0 - 1] + data[i - T0 + 1]) +
- (1.0 - w) * g02 * (data[i - T0 - 2] + data[i - T0 + 2]) +
- w * g10 * x2 +
- w * g11 * (x1 + x3) +
- w * g12 * (x0 + x4);
- x4 = x3;
- x3 = x2;
- x2 = x1;
- x1 = x0;
+ f->block[0].collapse_masks[i] = (uint8_t)cm[0];
+ f->block[f->channels - 1].collapse_masks[i] = (uint8_t)cm[1];
+ f->remaining += f->pulses[i] + consumed;
+
+ /* Update the folding position only as long as we have 1 bit/sample depth */
+ update_lowband = (b > band_size << 3);
}
}
-static void celt_postfilter(CeltFrame *f, CeltBlock *block)
+#define NORMC(bits) ((bits) << (f->channels - 1) << f->size >> 2)
+
+void ff_celt_bitalloc(CeltFrame *f, OpusRangeCoder *rc, int encode)
{
- int len = f->blocksize * f->blocks;
- const int filter_len = len - 2 * CELT_OVERLAP;
+ int i, j, low, high, total, done, bandbits, remaining, tbits_8ths;
+ int skip_startband = f->start_band;
+ int skip_bit = 0;
+ int intensitystereo_bit = 0;
+ int dualstereo_bit = 0;
+ int dynalloc = 6;
+ int extrabits = 0;
+
+ int boost[CELT_MAX_BANDS] = { 0 };
+ int trim_offset[CELT_MAX_BANDS];
+ int threshold[CELT_MAX_BANDS];
+ int bits1[CELT_MAX_BANDS];
+ int bits2[CELT_MAX_BANDS];
+
+ /* Spread */
+ if (opus_rc_tell(rc) + 4 <= f->framebits) {
+ if (encode)
+ ff_opus_rc_enc_cdf(rc, f->spread, ff_celt_model_spread);
+ else
+ f->spread = ff_opus_rc_dec_cdf(rc, ff_celt_model_spread);
+ } else {
+ f->spread = CELT_SPREAD_NORMAL;
+ }
- celt_postfilter_apply_transition(block, block->buf + 1024);
+ /* Initialize static allocation caps */
+ for (i = 0; i < CELT_MAX_BANDS; i++)
+ f->caps[i] = NORMC((ff_celt_static_caps[f->size][f->channels - 1][i] + 64) * ff_celt_freq_range[i]);
- block->pf_period_old = block->pf_period;
- memcpy(block->pf_gains_old, block->pf_gains, sizeof(block->pf_gains));
+ /* Band boosts */
+ tbits_8ths = f->framebits << 3;
+ for (i = f->start_band; i < f->end_band; i++) {
+ int quanta = ff_celt_freq_range[i] << (f->channels - 1) << f->size;
+ int b_dynalloc = dynalloc;
+ int boost_amount = f->alloc_boost[i];
+ quanta = FFMIN(quanta << 3, FFMAX(6 << 3, quanta));
+
+ while (opus_rc_tell_frac(rc) + (b_dynalloc << 3) < tbits_8ths && boost[i] < f->caps[i]) {
+ int is_boost;
+ if (encode) {
+ is_boost = boost_amount--;
+ ff_opus_rc_enc_log(rc, is_boost, b_dynalloc);
+ } else {
+ is_boost = ff_opus_rc_dec_log(rc, b_dynalloc);
+ }
- block->pf_period = block->pf_period_new;
- memcpy(block->pf_gains, block->pf_gains_new, sizeof(block->pf_gains));
+ if (!is_boost)
+ break;
- if (len > CELT_OVERLAP) {
- celt_postfilter_apply_transition(block, block->buf + 1024 + CELT_OVERLAP);
+ boost[i] += quanta;
+ tbits_8ths -= quanta;
- if (block->pf_gains[0] > FLT_EPSILON && filter_len > 0)
- f->opusdsp.postfilter(block->buf + 1024 + 2 * CELT_OVERLAP,
- block->pf_period, block->pf_gains,
- filter_len);
+ b_dynalloc = 1;
+ }
- block->pf_period_old = block->pf_period;
- memcpy(block->pf_gains_old, block->pf_gains, sizeof(block->pf_gains));
+ if (boost[i])
+ dynalloc = FFMAX(dynalloc - 1, 2);
}
- memmove(block->buf, block->buf + len, (1024 + CELT_OVERLAP / 2) * sizeof(float));
-}
-
-static int parse_postfilter(CeltFrame *f, OpusRangeCoder *rc, int consumed)
-{
- int i;
-
- memset(f->block[0].pf_gains_new, 0, sizeof(f->block[0].pf_gains_new));
- memset(f->block[1].pf_gains_new, 0, sizeof(f->block[1].pf_gains_new));
-
- if (f->start_band == 0 && consumed + 16 <= f->framebits) {
- int has_postfilter = ff_opus_rc_dec_log(rc, 1);
- if (has_postfilter) {
- float gain;
- int tapset, octave, period;
-
- octave = ff_opus_rc_dec_uint(rc, 6);
- period = (16 << octave) + ff_opus_rc_get_raw(rc, 4 + octave) - 1;
- gain = 0.09375f * (ff_opus_rc_get_raw(rc, 3) + 1);
- tapset = (opus_rc_tell(rc) + 2 <= f->framebits) ?
- ff_opus_rc_dec_cdf(rc, ff_celt_model_tapset) : 0;
-
- for (i = 0; i < 2; i++) {
- CeltBlock *block = &f->block[i];
-
- block->pf_period_new = FFMAX(period, CELT_POSTFILTER_MINPERIOD);
- block->pf_gains_new[0] = gain * ff_celt_postfilter_taps[tapset][0];
- block->pf_gains_new[1] = gain * ff_celt_postfilter_taps[tapset][1];
- block->pf_gains_new[2] = gain * ff_celt_postfilter_taps[tapset][2];
+ /* Allocation trim */
+ if (!encode)
+ f->alloc_trim = 5;
+ if (opus_rc_tell_frac(rc) + (6 << 3) <= tbits_8ths)
+ if (encode)
+ ff_opus_rc_enc_cdf(rc, f->alloc_trim, ff_celt_model_alloc_trim);
+ else
+ f->alloc_trim = ff_opus_rc_dec_cdf(rc, ff_celt_model_alloc_trim);
+
+ /* Anti-collapse bit reservation */
+ tbits_8ths = (f->framebits << 3) - opus_rc_tell_frac(rc) - 1;
+ f->anticollapse_needed = 0;
+ if (f->transient && f->size >= 2 && tbits_8ths >= ((f->size + 2) << 3))
+ f->anticollapse_needed = 1 << 3;
+ tbits_8ths -= f->anticollapse_needed;
+
+ /* Band skip bit reservation */
+ if (tbits_8ths >= 1 << 3)
+ skip_bit = 1 << 3;
+ tbits_8ths -= skip_bit;
+
+ /* Intensity/dual stereo bit reservation */
+ if (f->channels == 2) {
+ intensitystereo_bit = ff_celt_log2_frac[f->end_band - f->start_band];
+ if (intensitystereo_bit <= tbits_8ths) {
+ tbits_8ths -= intensitystereo_bit;
+ if (tbits_8ths >= 1 << 3) {
+ dualstereo_bit = 1 << 3;
+ tbits_8ths -= 1 << 3;
}
+ } else {
+ intensitystereo_bit = 0;
}
-
- consumed = opus_rc_tell(rc);
}
- return consumed;
-}
-
-static void process_anticollapse(CeltFrame *f, CeltBlock *block, float *X)
-{
- int i, j, k;
-
+ /* Trim offsets */
for (i = f->start_band; i < f->end_band; i++) {
- int renormalize = 0;
- float *xptr;
- float prev[2];
- float Ediff, r;
- float thresh, sqrt_1;
- int depth;
-
- /* depth in 1/8 bits */
- depth = (1 + f->pulses[i]) / (ff_celt_freq_range[i] << f->size);
- thresh = exp2f(-1.0 - 0.125f * depth);
- sqrt_1 = 1.0f / sqrtf(ff_celt_freq_range[i] << f->size);
-
- xptr = X + (ff_celt_freq_bands[i] << f->size);
-
- prev[0] = block->prev_energy[0][i];
- prev[1] = block->prev_energy[1][i];
- if (f->channels == 1) {
- CeltBlock *block1 = &f->block[1];
-
- prev[0] = FFMAX(prev[0], block1->prev_energy[0][i]);
- prev[1] = FFMAX(prev[1], block1->prev_energy[1][i]);
- }
- Ediff = block->energy[i] - FFMIN(prev[0], prev[1]);
- Ediff = FFMAX(0, Ediff);
-
- /* r needs to be multiplied by 2 or 2*sqrt(2) depending on LM because
- short blocks don't have the same energy as long */
- r = exp2f(1 - Ediff);
- if (f->size == 3)
- r *= M_SQRT2;
- r = FFMIN(thresh, r) * sqrt_1;
- for (k = 0; k < 1 << f->size; k++) {
- /* Detect collapse */
- if (!(block->collapse_masks[i] & 1 << k)) {
- /* Fill with noise */
- for (j = 0; j < ff_celt_freq_range[i]; j++)
- xptr[(j << f->size) + k] = (celt_rng(f) & 0x8000) ? r : -r;
- renormalize = 1;
- }
- }
+ int trim = f->alloc_trim - 5 - f->size;
+ int band = ff_celt_freq_range[i] * (f->end_band - i - 1);
+ int duration = f->size + 3;
+ int scale = duration + f->channels - 1;
- /* We just added some energy, so we need to renormalize */
- if (renormalize)
- celt_renormalize_vector(xptr, ff_celt_freq_range[i] << f->size, 1.0f);
- }
-}
+ /* PVQ minimum allocation threshold, below this value the band is
+ * skipped */
+ threshold[i] = FFMAX(3 * ff_celt_freq_range[i] << duration >> 4,
+ f->channels << 3);
-int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc,
- float **output, int channels, int frame_size,
- int start_band, int end_band)
-{
- int i, j, downmix = 0;
- int consumed; // bits of entropy consumed thus far for this frame
- MDCT15Context *imdct;
-
- if (channels != 1 && channels != 2) {
- av_log(f->avctx, AV_LOG_ERROR, "Invalid number of coded channels: %d\n",
- channels);
- return AVERROR_INVALIDDATA;
- }
- if (start_band < 0 || start_band > end_band || end_band > CELT_MAX_BANDS) {
- av_log(f->avctx, AV_LOG_ERROR, "Invalid start/end band: %d %d\n",
- start_band, end_band);
- return AVERROR_INVALIDDATA;
- }
+ trim_offset[i] = trim * (band << scale) >> 6;
- f->silence = 0;
- f->transient = 0;
- f->anticollapse = 0;
- f->flushed = 0;
- f->channels = channels;
- f->start_band = start_band;
- f->end_band = end_band;
- f->framebits = rc->rb.bytes * 8;
-
- f->size = av_log2(frame_size / CELT_SHORT_BLOCKSIZE);
- if (f->size > CELT_MAX_LOG_BLOCKS ||
- frame_size != CELT_SHORT_BLOCKSIZE * (1 << f->size)) {
- av_log(f->avctx, AV_LOG_ERROR, "Invalid CELT frame size: %d\n",
- frame_size);
- return AVERROR_INVALIDDATA;
+ if (ff_celt_freq_range[i] << f->size == 1)
+ trim_offset[i] -= f->channels << 3;
}
- if (!f->output_channels)
- f->output_channels = channels;
+ /* Bisection */
+ low = 1;
+ high = CELT_VECTORS - 1;
+ while (low <= high) {
+ int center = (low + high) >> 1;
+ done = total = 0;
+
+ for (i = f->end_band - 1; i >= f->start_band; i--) {
+ bandbits = NORMC(ff_celt_freq_range[i] * ff_celt_static_alloc[center][i]);
+
+ if (bandbits)
+ bandbits = FFMAX(bandbits + trim_offset[i], 0);
+ bandbits += boost[i];
+
+ if (bandbits >= threshold[i] || done) {
+ done = 1;
+ total += FFMIN(bandbits, f->caps[i]);
+ } else if (bandbits >= f->channels << 3) {
+ total += f->channels << 3;
+ }
+ }
- for (i = 0; i < f->channels; i++) {
- memset(f->block[i].coeffs, 0, sizeof(f->block[i].coeffs));
- memset(f->block[i].collapse_masks, 0, sizeof(f->block[i].collapse_masks));
+ if (total > tbits_8ths)
+ high = center - 1;
+ else
+ low = center + 1;
}
+ high = low--;
- consumed = opus_rc_tell(rc);
-
- /* obtain silence flag */
- if (consumed >= f->framebits)
- f->silence = 1;
- else if (consumed == 1)
- f->silence = ff_opus_rc_dec_log(rc, 15);
-
-
- if (f->silence) {
- consumed = f->framebits;
- rc->total_bits += f->framebits - opus_rc_tell(rc);
+ /* Bisection */
+ for (i = f->start_band; i < f->end_band; i++) {
+ bits1[i] = NORMC(ff_celt_freq_range[i] * ff_celt_static_alloc[low][i]);
+ bits2[i] = high >= CELT_VECTORS ? f->caps[i] :
+ NORMC(ff_celt_freq_range[i] * ff_celt_static_alloc[high][i]);
+
+ if (bits1[i])
+ bits1[i] = FFMAX(bits1[i] + trim_offset[i], 0);
+ if (bits2[i])
+ bits2[i] = FFMAX(bits2[i] + trim_offset[i], 0);
+
+ if (low)
+ bits1[i] += boost[i];
+ bits2[i] += boost[i];
+
+ if (boost[i])
+ skip_startband = i;
+ bits2[i] = FFMAX(bits2[i] - bits1[i], 0);
}
- /* obtain post-filter options */
- consumed = parse_postfilter(f, rc, consumed);
-
- /* obtain transient flag */
- if (f->size != 0 && consumed+3 <= f->framebits)
- f->transient = ff_opus_rc_dec_log(rc, 3);
-
- f->blocks = f->transient ? 1 << f->size : 1;
- f->blocksize = frame_size / f->blocks;
-
- imdct = f->imdct[f->transient ? 0 : f->size];
-
- if (channels == 1) {
- for (i = 0; i < CELT_MAX_BANDS; i++)
- f->block[0].energy[i] = FFMAX(f->block[0].energy[i], f->block[1].energy[i]);
+ /* Bisection */
+ low = 0;
+ high = 1 << CELT_ALLOC_STEPS;
+ for (i = 0; i < CELT_ALLOC_STEPS; i++) {
+ int center = (low + high) >> 1;
+ done = total = 0;
+
+ for (j = f->end_band - 1; j >= f->start_band; j--) {
+ bandbits = bits1[j] + (center * bits2[j] >> CELT_ALLOC_STEPS);
+
+ if (bandbits >= threshold[j] || done) {
+ done = 1;
+ total += FFMIN(bandbits, f->caps[j]);
+ } else if (bandbits >= f->channels << 3)
+ total += f->channels << 3;
+ }
+ if (total > tbits_8ths)
+ high = center;
+ else
+ low = center;
}
- celt_decode_coarse_energy(f, rc);
- celt_decode_tf_changes (f, rc);
- ff_celt_bitalloc (f, rc, 0);
- celt_decode_fine_energy (f, rc);
- ff_celt_quant_bands (f, rc);
-
- if (f->anticollapse_needed)
- f->anticollapse = ff_opus_rc_get_raw(rc, 1);
-
- celt_decode_final_energy(f, rc);
+ /* Bisection */
+ done = total = 0;
+ for (i = f->end_band - 1; i >= f->start_band; i--) {
+ bandbits = bits1[i] + (low * bits2[i] >> CELT_ALLOC_STEPS);
- /* apply anti-collapse processing and denormalization to
- * each coded channel */
- for (i = 0; i < f->channels; i++) {
- CeltBlock *block = &f->block[i];
+ if (bandbits >= threshold[i] || done)
+ done = 1;
+ else
+ bandbits = (bandbits >= f->channels << 3) ?
+ f->channels << 3 : 0;
- if (f->anticollapse)
- process_anticollapse(f, block, f->block[i].coeffs);
-
- celt_denormalize(f, block, f->block[i].coeffs);
+ bandbits = FFMIN(bandbits, f->caps[i]);
+ f->pulses[i] = bandbits;
+ total += bandbits;
}
- /* stereo -> mono downmix */
- if (f->output_channels < f->channels) {
- f->dsp->vector_fmac_scalar(f->block[0].coeffs, f->block[1].coeffs, 1.0, FFALIGN(frame_size, 16));
- downmix = 1;
- } else if (f->output_channels > f->channels)
- memcpy(f->block[1].coeffs, f->block[0].coeffs, frame_size * sizeof(float));
-
- if (f->silence) {
- for (i = 0; i < 2; i++) {
- CeltBlock *block = &f->block[i];
+ /* Band skipping */
+ for (f->coded_bands = f->end_band; ; f->coded_bands--) {
+ int allocation;
+ j = f->coded_bands - 1;
- for (j = 0; j < FF_ARRAY_ELEMS(block->energy); j++)
- block->energy[j] = CELT_ENERGY_SILENCE;
+ if (j == skip_startband) {
+ /* all remaining bands are not skipped */
+ tbits_8ths += skip_bit;
+ break;
}
- memset(f->block[0].coeffs, 0, sizeof(f->block[0].coeffs));
- memset(f->block[1].coeffs, 0, sizeof(f->block[1].coeffs));
- }
- /* transform and output for each output channel */
- for (i = 0; i < f->output_channels; i++) {
- CeltBlock *block = &f->block[i];
+ /* determine the number of bits available for coding "do not skip" markers */
+ remaining = tbits_8ths - total;
+ bandbits = remaining / (ff_celt_freq_bands[j+1] - ff_celt_freq_bands[f->start_band]);
+ remaining -= bandbits * (ff_celt_freq_bands[j+1] - ff_celt_freq_bands[f->start_band]);
+ allocation = f->pulses[j] + bandbits * ff_celt_freq_range[j];
+ allocation += FFMAX(remaining - (ff_celt_freq_bands[j] - ff_celt_freq_bands[f->start_band]), 0);
+
+ /* a "do not skip" marker is only coded if the allocation is
+ * above the chosen threshold */
+ if (allocation >= FFMAX(threshold[j], (f->channels + 1) << 3)) {
+ int do_not_skip;
+ if (encode) {
+ do_not_skip = f->coded_bands <= f->skip_band_floor;
+ ff_opus_rc_enc_log(rc, do_not_skip, 1);
+ } else {
+ do_not_skip = ff_opus_rc_dec_log(rc, 1);
+ }
- /* iMDCT and overlap-add */
- for (j = 0; j < f->blocks; j++) {
- float *dst = block->buf + 1024 + j * f->blocksize;
+ if (do_not_skip)
+ break;
- imdct->imdct_half(imdct, dst + CELT_OVERLAP / 2, f->block[i].coeffs + j,
- f->blocks);
- f->dsp->vector_fmul_window(dst, dst, dst + CELT_OVERLAP / 2,
- ff_celt_window, CELT_OVERLAP / 2);
+ total += 1 << 3;
+ allocation -= 1 << 3;
}
- if (downmix)
- f->dsp->vector_fmul_scalar(&block->buf[1024], &block->buf[1024], 0.5f, frame_size);
-
- /* postfilter */
- celt_postfilter(f, block);
+ /* the band is skipped, so reclaim its bits */
+ total -= f->pulses[j];
+ if (intensitystereo_bit) {
+ total -= intensitystereo_bit;
+ intensitystereo_bit = ff_celt_log2_frac[j - f->start_band];
+ total += intensitystereo_bit;
+ }
- /* deemphasis */
- block->emph_coeff = f->opusdsp.deemphasis(output[i],
- &block->buf[1024 - frame_size],
- block->emph_coeff, frame_size);
+ total += f->pulses[j] = (allocation >= f->channels << 3) ? f->channels << 3 : 0;
}
- if (channels == 1)
- memcpy(f->block[1].energy, f->block[0].energy, sizeof(f->block[0].energy));
-
- for (i = 0; i < 2; i++ ) {
- CeltBlock *block = &f->block[i];
-
- if (!f->transient) {
- memcpy(block->prev_energy[1], block->prev_energy[0], sizeof(block->prev_energy[0]));
- memcpy(block->prev_energy[0], block->energy, sizeof(block->prev_energy[0]));
- } else {
- for (j = 0; j < CELT_MAX_BANDS; j++)
- block->prev_energy[0][j] = FFMIN(block->prev_energy[0][j], block->energy[j]);
- }
-
- for (j = 0; j < f->start_band; j++) {
- block->prev_energy[0][j] = CELT_ENERGY_SILENCE;
- block->energy[j] = 0.0;
- }
- for (j = f->end_band; j < CELT_MAX_BANDS; j++) {
- block->prev_energy[0][j] = CELT_ENERGY_SILENCE;
- block->energy[j] = 0.0;
+ /* IS start band */
+ if (encode) {
+ if (intensitystereo_bit) {
+ f->intensity_stereo = FFMIN(f->intensity_stereo, f->coded_bands);
+ ff_opus_rc_enc_uint(rc, f->intensity_stereo, f->coded_bands + 1 - f->start_band);
}
+ } else {
+ f->intensity_stereo = f->dual_stereo = 0;
+ if (intensitystereo_bit)
+ f->intensity_stereo = f->start_band + ff_opus_rc_dec_uint(rc, f->coded_bands + 1 - f->start_band);
}
- f->seed = rc->range;
-
- return 0;
-}
-
-void ff_celt_flush(CeltFrame *f)
-{
- int i, j;
-
- if (f->flushed)
- return;
-
- for (i = 0; i < 2; i++) {
- CeltBlock *block = &f->block[i];
-
- for (j = 0; j < CELT_MAX_BANDS; j++)
- block->prev_energy[0][j] = block->prev_energy[1][j] = CELT_ENERGY_SILENCE;
-
- memset(block->energy, 0, sizeof(block->energy));
- memset(block->buf, 0, sizeof(block->buf));
-
- memset(block->pf_gains, 0, sizeof(block->pf_gains));
- memset(block->pf_gains_old, 0, sizeof(block->pf_gains_old));
- memset(block->pf_gains_new, 0, sizeof(block->pf_gains_new));
-
- /* libopus uses CELT_EMPH_COEFF on init, but 0 is better since there's
- * a lesser discontinuity when seeking.
- * The deemphasis functions differ from libopus in that they require
- * an initial state divided by the coefficient. */
- block->emph_coeff = 0.0f / CELT_EMPH_COEFF;
+ /* DS flag */
+ if (f->intensity_stereo <= f->start_band)
+ tbits_8ths += dualstereo_bit; /* no intensity stereo means no dual stereo */
+ else if (dualstereo_bit)
+ if (encode)
+ ff_opus_rc_enc_log(rc, f->dual_stereo, 1);
+ else
+ f->dual_stereo = ff_opus_rc_dec_log(rc, 1);
+
+ /* Supply the remaining bits in this frame to lower bands */
+ remaining = tbits_8ths - total;
+ bandbits = remaining / (ff_celt_freq_bands[f->coded_bands] - ff_celt_freq_bands[f->start_band]);
+ remaining -= bandbits * (ff_celt_freq_bands[f->coded_bands] - ff_celt_freq_bands[f->start_band]);
+ for (i = f->start_band; i < f->coded_bands; i++) {
+ const int bits = FFMIN(remaining, ff_celt_freq_range[i]);
+ f->pulses[i] += bits + bandbits * ff_celt_freq_range[i];
+ remaining -= bits;
}
- f->seed = 0;
-
- f->flushed = 1;
-}
-
-void ff_celt_free(CeltFrame **f)
-{
- CeltFrame *frm = *f;
- int i;
-
- if (!frm)
- return;
- for (i = 0; i < FF_ARRAY_ELEMS(frm->imdct); i++)
- ff_mdct15_uninit(&frm->imdct[i]);
-
- ff_celt_pvq_uninit(&frm->pvq);
-
- av_freep(&frm->dsp);
- av_freep(f);
-}
+ /* Finally determine the allocation */
+ for (i = f->start_band; i < f->coded_bands; i++) {
+ int N = ff_celt_freq_range[i] << f->size;
+ int prev_extra = extrabits;
+ f->pulses[i] += extrabits;
+
+ if (N > 1) {
+ int dof; /* degrees of freedom */
+ int temp; /* dof * channels * log(dof) */
+ int fine_bits;
+ int max_bits;
+ int offset; /* fine energy quantization offset, i.e.
+ * extra bits assigned over the standard
+ * totalbits/dof */
+
+ extrabits = FFMAX(f->pulses[i] - f->caps[i], 0);
+ f->pulses[i] -= extrabits;
+
+ /* intensity stereo makes use of an extra degree of freedom */
+ dof = N * f->channels + (f->channels == 2 && N > 2 && !f->dual_stereo && i < f->intensity_stereo);
+ temp = dof * (ff_celt_log_freq_range[i] + (f->size << 3));
+ offset = (temp >> 1) - dof * CELT_FINE_OFFSET;
+ if (N == 2) /* dof=2 is the only case that doesn't fit the model */
+ offset += dof << 1;
+
+ /* grant an additional bias for the first and second pulses */
+ if (f->pulses[i] + offset < 2 * (dof << 3))
+ offset += temp >> 2;
+ else if (f->pulses[i] + offset < 3 * (dof << 3))
+ offset += temp >> 3;
+
+ fine_bits = (f->pulses[i] + offset + (dof << 2)) / (dof << 3);
+ max_bits = FFMIN((f->pulses[i] >> 3) >> (f->channels - 1), CELT_MAX_FINE_BITS);
+ max_bits = FFMAX(max_bits, 0);
+ f->fine_bits[i] = av_clip(fine_bits, 0, max_bits);
+
+ /* If fine_bits was rounded down or capped,
+ * give priority for the final fine energy pass */
+ f->fine_priority[i] = (f->fine_bits[i] * (dof << 3) >= f->pulses[i] + offset);
+
+ /* the remaining bits are assigned to PVQ */
+ f->pulses[i] -= f->fine_bits[i] << (f->channels - 1) << 3;
+ } else {
+ /* all bits go to fine energy except for the sign bit */
+ extrabits = FFMAX(f->pulses[i] - (f->channels << 3), 0);
+ f->pulses[i] -= extrabits;
+ f->fine_bits[i] = 0;
+ f->fine_priority[i] = 1;
+ }
-int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels,
- int apply_phase_inv)
-{
- CeltFrame *frm;
- int i, ret;
+ /* hand back a limited number of extra fine energy bits to this band */
+ if (extrabits > 0) {
+ int fineextra = FFMIN(extrabits >> (f->channels + 2),
+ CELT_MAX_FINE_BITS - f->fine_bits[i]);
+ f->fine_bits[i] += fineextra;
- if (output_channels != 1 && output_channels != 2) {
- av_log(avctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n",
- output_channels);
- return AVERROR(EINVAL);
+ fineextra <<= f->channels + 2;
+ f->fine_priority[i] = (fineextra >= extrabits - prev_extra);
+ extrabits -= fineextra;
+ }
}
+ f->remaining = extrabits;
- frm = av_mallocz(sizeof(*frm));
- if (!frm)
- return AVERROR(ENOMEM);
-
- frm->avctx = avctx;
- frm->output_channels = output_channels;
- frm->apply_phase_inv = apply_phase_inv;
-
- for (i = 0; i < FF_ARRAY_ELEMS(frm->imdct); i++)
- if ((ret = ff_mdct15_init(&frm->imdct[i], 1, i + 3, -1.0f/32768)) < 0)
- goto fail;
-
- if ((ret = ff_celt_pvq_init(&frm->pvq, 0)) < 0)
- goto fail;
-
- frm->dsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
- if (!frm->dsp) {
- ret = AVERROR(ENOMEM);
- goto fail;
+ /* skipped bands dedicate all of their bits for fine energy */
+ for (; i < f->end_band; i++) {
+ f->fine_bits[i] = f->pulses[i] >> (f->channels - 1) >> 3;
+ f->pulses[i] = 0;
+ f->fine_priority[i] = f->fine_bits[i] < 1;
}
-
- ff_opus_dsp_init(&frm->opusdsp);
- ff_celt_flush(frm);
-
- *f = frm;
-
- return 0;
-fail:
- ff_celt_free(&frm);
- return ret;
}
projects / platform / upstream / ffmpeg.git / blobdiff