}
}
-static void celt_decode_allocation(CeltFrame *f, OpusRangeCoder *rc)
-{
- // approx. maximum bit allocation for each band before boost/trim
- int cap[CELT_MAX_BANDS];
- int boost[CELT_MAX_BANDS];
- int threshold[CELT_MAX_BANDS];
- int bits1[CELT_MAX_BANDS];
- int bits2[CELT_MAX_BANDS];
- int trim_offset[CELT_MAX_BANDS];
-
- int skip_start_band = f->start_band;
- int dynalloc = 6;
- int alloctrim = 5;
- int extrabits = 0;
-
- int skip_bit = 0;
- int intensity_stereo_bit = 0;
- int dual_stereo_bit = 0;
-
- int remaining, bandbits;
- int low, high, total, done;
- int totalbits;
- int consumed;
- int i, j;
-
- consumed = opus_rc_tell(rc);
-
- /* obtain spread flag */
- f->spread = CELT_SPREAD_NORMAL;
- if (consumed + 4 <= f->framebits)
- f->spread = ff_opus_rc_dec_cdf(rc, ff_celt_model_spread);
-
- /* generate static allocation caps */
- for (i = 0; i < CELT_MAX_BANDS; i++) {
- cap[i] = (ff_celt_static_caps[f->size][f->channels - 1][i] + 64)
- * ff_celt_freq_range[i] << (f->channels - 1) << f->size >> 2;
- }
-
- /* obtain band boost */
- totalbits = f->framebits << 3; // convert to 1/8 bits
- consumed = opus_rc_tell_frac(rc);
- for (i = f->start_band; i < f->end_band; i++) {
- int quanta, band_dynalloc;
-
- boost[i] = 0;
-
- quanta = ff_celt_freq_range[i] << (f->channels - 1) << f->size;
- quanta = FFMIN(quanta << 3, FFMAX(6 << 3, quanta));
- band_dynalloc = dynalloc;
- while (consumed + (band_dynalloc<<3) < totalbits && boost[i] < cap[i]) {
- int add = ff_opus_rc_dec_log(rc, band_dynalloc);
- consumed = opus_rc_tell_frac(rc);
- if (!add)
- break;
-
- boost[i] += quanta;
- totalbits -= quanta;
- band_dynalloc = 1;
- }
- /* dynalloc is more likely to occur if it's already been used for earlier bands */
- if (boost[i])
- dynalloc = FFMAX(2, dynalloc - 1);
- }
-
- /* obtain allocation trim */
- if (consumed + (6 << 3) <= totalbits)
- alloctrim = ff_opus_rc_dec_cdf(rc, ff_celt_model_alloc_trim);
-
- /* anti-collapse bit reservation */
- totalbits = (f->framebits << 3) - opus_rc_tell_frac(rc) - 1;
- f->anticollapse_needed = 0;
- if (f->blocks > 1 && f->size >= 2 &&
- totalbits >= ((f->size + 2) << 3))
- f->anticollapse_needed = 1 << 3;
- totalbits -= f->anticollapse_needed;
-
- /* band skip bit reservation */
- if (totalbits >= 1 << 3)
- skip_bit = 1 << 3;
- totalbits -= skip_bit;
-
- /* intensity/dual stereo bit reservation */
- if (f->channels == 2) {
- intensity_stereo_bit = ff_celt_log2_frac[f->end_band - f->start_band];
- if (intensity_stereo_bit <= totalbits) {
- totalbits -= intensity_stereo_bit;
- if (totalbits >= 1 << 3) {
- dual_stereo_bit = 1 << 3;
- totalbits -= 1 << 3;
- }
- } else
- intensity_stereo_bit = 0;
- }
-
- for (i = f->start_band; i < f->end_band; i++) {
- int trim = alloctrim - 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 = ff_celt_freq_range[i] * ff_celt_static_alloc[center][i]
- << (f->channels - 1) << f->size >> 2;
-
- if (bandbits)
- bandbits = FFMAX(0, bandbits + trim_offset[i]);
- bandbits += boost[i];
-
- if (bandbits >= threshold[i] || done) {
- done = 1;
- total += FFMIN(bandbits, cap[i]);
- } else if (bandbits >= f->channels << 3)
- total += f->channels << 3;
- }
-
- if (total > totalbits)
- high = center - 1;
- else
- low = center + 1;
- }
- high = low--;
-
- for (i = f->start_band; i < f->end_band; i++) {
- bits1[i] = ff_celt_freq_range[i] * ff_celt_static_alloc[low][i]
- << (f->channels - 1) << f->size >> 2;
- bits2[i] = high >= CELT_VECTORS ? cap[i] :
- ff_celt_freq_range[i] * ff_celt_static_alloc[high][i]
- << (f->channels - 1) << f->size >> 2;
-
- if (bits1[i])
- bits1[i] = FFMAX(0, bits1[i] + trim_offset[i]);
- if (bits2[i])
- bits2[i] = FFMAX(0, bits2[i] + trim_offset[i]);
- if (low)
- bits1[i] += boost[i];
- bits2[i] += boost[i];
-
- if (boost[i])
- skip_start_band = i;
- bits2[i] = FFMAX(0, bits2[i] - bits1[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, cap[j]);
- } else if (bandbits >= f->channels << 3)
- total += f->channels << 3;
- }
- if (total > totalbits)
- high = center;
- else
- low = center;
- }
-
- 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, cap[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_start_band) {
- /* all remaining bands are not skipped */
- totalbits += skip_bit;
- break;
- }
-
- /* determine the number of bits available for coding "do not skip" markers */
- remaining = totalbits - 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]
- + FFMAX(0, remaining - (ff_celt_freq_bands[j] - ff_celt_freq_bands[f->start_band]));
-
- /* 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 )) {
- if (ff_opus_rc_dec_log(rc, 1))
- break;
-
- total += 1 << 3;
- allocation -= 1 << 3;
- }
-
- /* the band is skipped, so reclaim its bits */
- total -= f->pulses[j];
- if (intensity_stereo_bit) {
- total -= intensity_stereo_bit;
- intensity_stereo_bit = ff_celt_log2_frac[j - f->start_band];
- total += intensity_stereo_bit;
- }
-
- total += f->pulses[j] = (allocation >= f->channels << 3) ?
- f->channels << 3 : 0;
- }
-
- /* obtain stereo flags */
- f->intensity_stereo = 0;
- f->dual_stereo = 0;
- if (intensity_stereo_bit)
- f->intensity_stereo = f->start_band +
- ff_opus_rc_dec_uint(rc, f->coded_bands + 1 - f->start_band);
- if (f->intensity_stereo <= f->start_band)
- totalbits += dual_stereo_bit; /* no intensity stereo means no dual stereo */
- else if (dual_stereo_bit)
- f->dual_stereo = ff_opus_rc_dec_log(rc, 1);
-
- /* supply the remaining bits in this frame to lower bands */
- remaining = totalbits - 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++) {
- int bits = FFMIN(remaining, ff_celt_freq_range[i]);
-
- f->pulses[i] += bits + bandbits * ff_celt_freq_range[i];
- remaining -= bits;
- }
-
- 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 offset; // fine energy quantization offset, i.e.
- // extra bits assigned over the standard
- // totalbits/dof
- int fine_bits, max_bits;
-
- extrabits = FFMAX(0, f->pulses[i] - cap[i]);
- 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(0, f->pulses[i] - (f->channels << 3));
- 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;
- }
-}
-
static void celt_denormalize(CeltFrame *f, CeltBlock *block, float *data)
{
int i, j;
celt_decode_coarse_energy(f, rc);
celt_decode_tf_changes (f, rc);
- celt_decode_allocation (f, rc);
+ ff_celt_bitalloc (f, rc, 0);
celt_decode_fine_energy (f, rc);
ff_celt_quant_bands (f, rc);
projects / ffmpeg / blobdiff