avcodec/opus: Rename opus.c->opus_celt.c, opus_celt.c->opusdec_celt.c

Since commit 4fc2531fff112836026aad2bdaf128c9d15a72e3 opus.c
contains only the celt stuff shared between decoder and encoder.
meanwhile, opus_celt.c is decoder-only. So the new names
reflect the actual content better than the current ones.

Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 0 insertions, 484 deletions

diff --git a/libavcodec/opus.c b/libavcodec/opus.c
deleted file mode 100644
index a24c38be52..0000000000
--- a/libavcodec/opus.c
+++ /dev/null
@@ -1,484 +0,0 @@
-/*
- * Copyright (c) 2012 Andrew D'Addesio
- * Copyright (c) 2013-2014 Mozilla Corporation
- *
- * 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 <stdint.h>
-
-#include "opus_celt.h"
-#include "opus_pvq.h"
-#include "opustab.h"
-
-void ff_celt_quant_bands(CeltFrame *f, OpusRangeCoder *rc)
-{
-    float lowband_scratch[8 * 22];
-    float norm1[2 * 8 * 100];
-    float *norm2 = norm1 + 8 * 100;
-
-    int totalbits = (f->framebits << 3) - f->anticollapse_needed;
-
-    int update_lowband = 1;
-    int lowband_offset = 0;
-
-    int i, j;
-
-    for (i = f->start_band; i < f->end_band; i++) {
-        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);
-        }
-
-        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;
-
-        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;
-
-            memcpy(&norm1[band_offset], &norm1[band_offset - count], count * sizeof(float));
-
-            if (f->channels == 2)
-                memcpy(&norm2[band_offset], &norm2[band_offset - count], count * sizeof(float));
-        }
-
-        /* 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];
-            }
-        }
-
-        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;
-        }
-
-        norm_loc1 = effective_lowband != -1 ? norm1 + (effective_lowband << f->size) : NULL;
-        norm_loc2 = effective_lowband != -1 ? norm2 + (effective_lowband << f->size) : NULL;
-
-        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]);
-
-            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];
-        }
-
-        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);
-    }
-}
-
-#define NORMC(bits) ((bits) << (f->channels - 1) << f->size >> 2)
-
-void ff_celt_bitalloc(CeltFrame *f, OpusRangeCoder *rc, int encode)
-{
-    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;
-    }
-
-    /* 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]);
-
-    /* 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);
-            }
-
-            if (!is_boost)
-                break;
-
-            boost[i]   += quanta;
-            tbits_8ths -= quanta;
-
-            b_dynalloc = 1;
-        }
-
-        if (boost[i])
-            dynalloc = FFMAX(dynalloc - 1, 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;
-        }
-    }
-
-    /* Trim offsets */
-    for (i = f->start_band; i < f->end_band; i++) {
-        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;
-
-        /* 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);
-
-        trim_offset[i] = trim * (band << scale) >> 6;
-
-        if (ff_celt_freq_range[i] << f->size == 1)
-            trim_offset[i] -= f->channels << 3;
-    }
-
-    /* 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;
-            }
-        }
-
-        if (total > tbits_8ths)
-            high = center - 1;
-        else
-            low = center + 1;
-    }
-    high = low--;
-
-    /* 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);
-    }
-
-    /* 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;
-    }
-
-    /* Bisection */
-    done = total = 0;
-    for (i = f->end_band - 1; i >= f->start_band; i--) {
-        bandbits = bits1[i] + (low * bits2[i] >> CELT_ALLOC_STEPS);
-
-        if (bandbits >= threshold[i] || done)
-            done = 1;
-        else
-            bandbits = (bandbits >= f->channels << 3) ?
-            f->channels << 3 : 0;
-
-        bandbits     = FFMIN(bandbits, f->caps[i]);
-        f->pulses[i] = bandbits;
-        total      += bandbits;
-    }
-
-    /* Band skipping */
-    for (f->coded_bands = f->end_band; ; f->coded_bands--) {
-        int allocation;
-        j = f->coded_bands - 1;
-
-        if (j == skip_startband) {
-            /* all remaining bands are not skipped */
-            tbits_8ths += skip_bit;
-            break;
-        }
-
-        /* 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);
-            }
-
-            if (do_not_skip)
-                break;
-
-            total      += 1 << 3;
-            allocation -= 1 << 3;
-        }
-
-        /* 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;
-        }
-
-        total += f->pulses[j] = (allocation >= f->channels << 3) ? f->channels << 3 : 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);
-    }
-
-    /* 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;
-    }
-
-    /* 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;
-        }
-
-        /* 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;
-
-            fineextra <<= f->channels + 2;
-            f->fine_priority[i] = (fineextra >= extrabits - prev_extra);
-            extrabits -= fineextra;
-        }
-    }
-    f->remaining = extrabits;
-
-    /* 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;
-    }
-}