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opus: merge encoder and decoder bitallocation functions into one
There's no difference apart from which entropy coding functions get called. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
This commit is contained in:
Rostislav Pehlivanov
parent
0c78b6a416
commit
51027d0b8b
@ -546,3 +546,351 @@ void ff_celt_quant_bands(CeltFrame *f, OpusRangeCoder *rc)
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update_lowband = (b > band_size << 3);
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}
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}
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#define NORMC(bits) ((bits) << (f->channels - 1) << f->size >> 2)
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void ff_celt_bitalloc(CeltFrame *f, OpusRangeCoder *rc, int encode)
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{
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int i, j, low, high, total, done, bandbits, remaining, tbits_8ths;
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int skip_startband = f->start_band;
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int skip_bit = 0;
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int intensitystereo_bit = 0;
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int dualstereo_bit = 0;
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int dynalloc = 6;
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int extrabits = 0;
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int boost[CELT_MAX_BANDS] = { 0 };
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int trim_offset[CELT_MAX_BANDS];
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int threshold[CELT_MAX_BANDS];
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int bits1[CELT_MAX_BANDS];
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int bits2[CELT_MAX_BANDS];
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/* Spread */
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if (opus_rc_tell(rc) + 4 <= f->framebits)
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if (encode)
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ff_opus_rc_enc_cdf(rc, f->spread, ff_celt_model_spread);
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else
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f->spread = ff_opus_rc_dec_cdf(rc, ff_celt_model_spread);
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else
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f->spread = CELT_SPREAD_NORMAL;
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/* Initialize static allocation caps */
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for (i = 0; i < CELT_MAX_BANDS; i++)
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f->caps[i] = NORMC((ff_celt_static_caps[f->size][f->channels - 1][i] + 64) * ff_celt_freq_range[i]);
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/* Band boosts */
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tbits_8ths = f->framebits << 3;
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for (i = f->start_band; i < f->end_band; i++) {
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int quanta = ff_celt_freq_range[i] << (f->channels - 1) << f->size;
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int b_dynalloc = dynalloc;
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int boost_amount = f->alloc_boost[i];
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quanta = FFMIN(quanta << 3, FFMAX(6 << 3, quanta));
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while (opus_rc_tell_frac(rc) + (b_dynalloc << 3) < tbits_8ths && boost[i] < f->caps[i]) {
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int is_boost;
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if (encode) {
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is_boost = boost_amount--;
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ff_opus_rc_enc_log(rc, is_boost, b_dynalloc);
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} else {
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is_boost = ff_opus_rc_dec_log(rc, b_dynalloc);
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}
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if (!is_boost)
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break;
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boost[i] += quanta;
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tbits_8ths -= quanta;
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b_dynalloc = 1;
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}
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if (boost[i])
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dynalloc = FFMAX(dynalloc - 1, 2);
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}
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/* Allocation trim */
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if (opus_rc_tell_frac(rc) + (6 << 3) <= tbits_8ths)
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if (encode)
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ff_opus_rc_enc_cdf(rc, f->alloc_trim, ff_celt_model_alloc_trim);
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else
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f->alloc_trim = ff_opus_rc_dec_cdf(rc, ff_celt_model_alloc_trim);
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/* Anti-collapse bit reservation */
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tbits_8ths = (f->framebits << 3) - opus_rc_tell_frac(rc) - 1;
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f->anticollapse_needed = 0;
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if (f->transient && f->size >= 2 && tbits_8ths >= ((f->size + 2) << 3))
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f->anticollapse_needed = 1 << 3;
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tbits_8ths -= f->anticollapse_needed;
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/* Band skip bit reservation */
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if (tbits_8ths >= 1 << 3)
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skip_bit = 1 << 3;
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tbits_8ths -= skip_bit;
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/* Intensity/dual stereo bit reservation */
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if (f->channels == 2) {
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intensitystereo_bit = ff_celt_log2_frac[f->end_band - f->start_band];
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if (intensitystereo_bit <= tbits_8ths) {
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tbits_8ths -= intensitystereo_bit;
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if (tbits_8ths >= 1 << 3) {
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dualstereo_bit = 1 << 3;
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tbits_8ths -= 1 << 3;
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}
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} else {
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intensitystereo_bit = 0;
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}
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}
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/* Trim offsets */
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for (i = f->start_band; i < f->end_band; i++) {
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int trim = f->alloc_trim - 5 - f->size;
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int band = ff_celt_freq_range[i] * (f->end_band - i - 1);
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int duration = f->size + 3;
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int scale = duration + f->channels - 1;
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/* PVQ minimum allocation threshold, below this value the band is
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* skipped */
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threshold[i] = FFMAX(3 * ff_celt_freq_range[i] << duration >> 4,
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f->channels << 3);
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trim_offset[i] = trim * (band << scale) >> 6;
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if (ff_celt_freq_range[i] << f->size == 1)
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trim_offset[i] -= f->channels << 3;
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}
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/* Bisection */
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low = 1;
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high = CELT_VECTORS - 1;
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while (low <= high) {
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int center = (low + high) >> 1;
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done = total = 0;
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for (i = f->end_band - 1; i >= f->start_band; i--) {
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bandbits = NORMC(ff_celt_freq_range[i] * ff_celt_static_alloc[center][i]);
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if (bandbits)
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bandbits = FFMAX(bandbits + trim_offset[i], 0);
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bandbits += boost[i];
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if (bandbits >= threshold[i] || done) {
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done = 1;
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total += FFMIN(bandbits, f->caps[i]);
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} else if (bandbits >= f->channels << 3) {
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total += f->channels << 3;
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}
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}
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if (total > tbits_8ths)
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high = center - 1;
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else
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low = center + 1;
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}
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high = low--;
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/* Bisection */
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for (i = f->start_band; i < f->end_band; i++) {
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bits1[i] = NORMC(ff_celt_freq_range[i] * ff_celt_static_alloc[low][i]);
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bits2[i] = high >= CELT_VECTORS ? f->caps[i] :
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NORMC(ff_celt_freq_range[i] * ff_celt_static_alloc[high][i]);
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if (bits1[i])
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bits1[i] = FFMAX(bits1[i] + trim_offset[i], 0);
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if (bits2[i])
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bits2[i] = FFMAX(bits2[i] + trim_offset[i], 0);
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if (low)
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bits1[i] += boost[i];
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bits2[i] += boost[i];
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if (boost[i])
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skip_startband = i;
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bits2[i] = FFMAX(bits2[i] - bits1[i], 0);
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}
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/* Bisection */
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low = 0;
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high = 1 << CELT_ALLOC_STEPS;
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for (i = 0; i < CELT_ALLOC_STEPS; i++) {
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int center = (low + high) >> 1;
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done = total = 0;
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for (j = f->end_band - 1; j >= f->start_band; j--) {
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bandbits = bits1[j] + (center * bits2[j] >> CELT_ALLOC_STEPS);
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if (bandbits >= threshold[j] || done) {
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done = 1;
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total += FFMIN(bandbits, f->caps[j]);
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} else if (bandbits >= f->channels << 3)
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total += f->channels << 3;
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}
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if (total > tbits_8ths)
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high = center;
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else
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low = center;
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}
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/* Bisection */
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done = total = 0;
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for (i = f->end_band - 1; i >= f->start_band; i--) {
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bandbits = bits1[i] + (low * bits2[i] >> CELT_ALLOC_STEPS);
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if (bandbits >= threshold[i] || done)
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done = 1;
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else
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bandbits = (bandbits >= f->channels << 3) ?
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f->channels << 3 : 0;
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bandbits = FFMIN(bandbits, f->caps[i]);
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f->pulses[i] = bandbits;
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total += bandbits;
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}
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/* Band skipping */
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for (f->coded_bands = f->end_band; ; f->coded_bands--) {
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int allocation;
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j = f->coded_bands - 1;
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if (j == skip_startband) {
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/* all remaining bands are not skipped */
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tbits_8ths += skip_bit;
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break;
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}
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/* determine the number of bits available for coding "do not skip" markers */
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remaining = tbits_8ths - total;
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bandbits = remaining / (ff_celt_freq_bands[j+1] - ff_celt_freq_bands[f->start_band]);
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remaining -= bandbits * (ff_celt_freq_bands[j+1] - ff_celt_freq_bands[f->start_band]);
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allocation = f->pulses[j] + bandbits * ff_celt_freq_range[j];
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allocation += FFMAX(remaining - (ff_celt_freq_bands[j] - ff_celt_freq_bands[f->start_band]), 0);
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/* a "do not skip" marker is only coded if the allocation is
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* above the chosen threshold */
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if (allocation >= FFMAX(threshold[j], (f->channels + 1) << 3)) {
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int do_not_skip;
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if (encode) {
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do_not_skip = f->coded_bands <= f->skip_band_floor;
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ff_opus_rc_enc_log(rc, do_not_skip, 1);
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} else {
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do_not_skip = ff_opus_rc_dec_log(rc, 1);
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}
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if (do_not_skip)
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break;
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total += 1 << 3;
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allocation -= 1 << 3;
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}
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/* the band is skipped, so reclaim its bits */
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total -= f->pulses[j];
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if (intensitystereo_bit) {
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total -= intensitystereo_bit;
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intensitystereo_bit = ff_celt_log2_frac[j - f->start_band];
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total += intensitystereo_bit;
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}
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total += f->pulses[j] = (allocation >= f->channels << 3) ? f->channels << 3 : 0;
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}
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/* IS start band */
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if (encode) {
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if (intensitystereo_bit) {
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f->intensity_stereo = FFMIN(f->intensity_stereo, f->coded_bands);
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ff_opus_rc_enc_uint(rc, f->intensity_stereo, f->coded_bands + 1 - f->start_band);
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}
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} else {
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f->intensity_stereo = f->dual_stereo = 0;
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if (intensitystereo_bit)
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f->intensity_stereo = f->start_band + ff_opus_rc_dec_uint(rc, f->coded_bands + 1 - f->start_band);
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}
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/* DS flag */
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if (f->intensity_stereo <= f->start_band)
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tbits_8ths += dualstereo_bit; /* no intensity stereo means no dual stereo */
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else if (dualstereo_bit)
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if (encode)
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ff_opus_rc_enc_log(rc, f->dual_stereo, 1);
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else
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f->dual_stereo = ff_opus_rc_dec_log(rc, 1);
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/* Supply the remaining bits in this frame to lower bands */
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remaining = tbits_8ths - total;
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bandbits = remaining / (ff_celt_freq_bands[f->coded_bands] - ff_celt_freq_bands[f->start_band]);
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remaining -= bandbits * (ff_celt_freq_bands[f->coded_bands] - ff_celt_freq_bands[f->start_band]);
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for (i = f->start_band; i < f->coded_bands; i++) {
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const int bits = FFMIN(remaining, ff_celt_freq_range[i]);
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f->pulses[i] += bits + bandbits * ff_celt_freq_range[i];
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remaining -= bits;
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}
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/* Finally determine the allocation */
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for (i = f->start_band; i < f->coded_bands; i++) {
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int N = ff_celt_freq_range[i] << f->size;
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int prev_extra = extrabits;
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f->pulses[i] += extrabits;
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if (N > 1) {
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int dof; /* degrees of freedom */
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int temp; /* dof * channels * log(dof) */
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int fine_bits;
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int max_bits;
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int offset; /* fine energy quantization offset, i.e.
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* extra bits assigned over the standard
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* totalbits/dof */
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extrabits = FFMAX(f->pulses[i] - f->caps[i], 0);
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f->pulses[i] -= extrabits;
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/* intensity stereo makes use of an extra degree of freedom */
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dof = N * f->channels + (f->channels == 2 && N > 2 && !f->dual_stereo && i < f->intensity_stereo);
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temp = dof * (ff_celt_log_freq_range[i] + (f->size << 3));
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offset = (temp >> 1) - dof * CELT_FINE_OFFSET;
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if (N == 2) /* dof=2 is the only case that doesn't fit the model */
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offset += dof << 1;
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/* grant an additional bias for the first and second pulses */
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if (f->pulses[i] + offset < 2 * (dof << 3))
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offset += temp >> 2;
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else if (f->pulses[i] + offset < 3 * (dof << 3))
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offset += temp >> 3;
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fine_bits = (f->pulses[i] + offset + (dof << 2)) / (dof << 3);
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max_bits = FFMIN((f->pulses[i] >> 3) >> (f->channels - 1), CELT_MAX_FINE_BITS);
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max_bits = FFMAX(max_bits, 0);
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f->fine_bits[i] = av_clip(fine_bits, 0, max_bits);
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/* If fine_bits was rounded down or capped,
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* give priority for the final fine energy pass */
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f->fine_priority[i] = (f->fine_bits[i] * (dof << 3) >= f->pulses[i] + offset);
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/* the remaining bits are assigned to PVQ */
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f->pulses[i] -= f->fine_bits[i] << (f->channels - 1) << 3;
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} else {
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/* all bits go to fine energy except for the sign bit */
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extrabits = FFMAX(f->pulses[i] - (f->channels << 3), 0);
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f->pulses[i] -= extrabits;
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f->fine_bits[i] = 0;
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f->fine_priority[i] = 1;
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}
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/* hand back a limited number of extra fine energy bits to this band */
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if (extrabits > 0) {
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int fineextra = FFMIN(extrabits >> (f->channels + 2),
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CELT_MAX_FINE_BITS - f->fine_bits[i]);
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f->fine_bits[i] += fineextra;
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fineextra <<= f->channels + 2;
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f->fine_priority[i] = (fineextra >= extrabits - prev_extra);
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extrabits -= fineextra;
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}
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}
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f->remaining = extrabits;
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/* skipped bands dedicate all of their bits for fine energy */
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for (; i < f->end_band; i++) {
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f->fine_bits[i] = f->pulses[i] >> (f->channels - 1) >> 3;
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f->pulses[i] = 0;
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f->fine_priority[i] = f->fine_bits[i] < 1;
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}
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}
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@ -194,4 +194,7 @@ int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc,
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/* Encode or decode CELT bands */
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void ff_celt_quant_bands(CeltFrame *f, OpusRangeCoder *rc);
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/* Encode or decode CELT bitallocation */
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void ff_celt_bitalloc(CeltFrame *f, OpusRangeCoder *rc, int encode);
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#endif /* AVCODEC_OPUS_H */
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@ -143,338 +143,6 @@ static void celt_decode_tf_changes(CeltFrame *f, OpusRangeCoder *rc)
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}
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}
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static void celt_decode_allocation(CeltFrame *f, OpusRangeCoder *rc)
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{
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// approx. maximum bit allocation for each band before boost/trim
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int cap[CELT_MAX_BANDS];
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int boost[CELT_MAX_BANDS];
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int threshold[CELT_MAX_BANDS];
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int bits1[CELT_MAX_BANDS];
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int bits2[CELT_MAX_BANDS];
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int trim_offset[CELT_MAX_BANDS];
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int skip_start_band = f->start_band;
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int dynalloc = 6;
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int alloctrim = 5;
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int extrabits = 0;
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int skip_bit = 0;
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int intensity_stereo_bit = 0;
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int dual_stereo_bit = 0;
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int remaining, bandbits;
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int low, high, total, done;
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int totalbits;
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int consumed;
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int i, j;
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consumed = opus_rc_tell(rc);
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/* obtain spread flag */
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f->spread = CELT_SPREAD_NORMAL;
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if (consumed + 4 <= f->framebits)
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f->spread = ff_opus_rc_dec_cdf(rc, ff_celt_model_spread);
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/* generate static allocation caps */
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for (i = 0; i < CELT_MAX_BANDS; i++) {
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cap[i] = (ff_celt_static_caps[f->size][f->channels - 1][i] + 64)
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* ff_celt_freq_range[i] << (f->channels - 1) << f->size >> 2;
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}
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/* obtain band boost */
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totalbits = f->framebits << 3; // convert to 1/8 bits
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consumed = opus_rc_tell_frac(rc);
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for (i = f->start_band; i < f->end_band; i++) {
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int quanta, band_dynalloc;
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boost[i] = 0;
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quanta = ff_celt_freq_range[i] << (f->channels - 1) << f->size;
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quanta = FFMIN(quanta << 3, FFMAX(6 << 3, quanta));
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band_dynalloc = dynalloc;
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while (consumed + (band_dynalloc<<3) < totalbits && boost[i] < cap[i]) {
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int add = ff_opus_rc_dec_log(rc, band_dynalloc);
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consumed = opus_rc_tell_frac(rc);
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if (!add)
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||||
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;
|
||||
@ -753,7 +421,7 @@ int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc,
|
||||
|
||||
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);
|
||||
|
||||
|
||||
@ -282,333 +282,6 @@ static void celt_enc_tf(CeltFrame *f, OpusRangeCoder *rc)
|
||||
f->tf_change[i] = ff_celt_tf_select[f->size][f->transient][tf_select][f->tf_change[i]];
|
||||
}
|
||||
|
||||
void ff_celt_enc_bitalloc(CeltFrame *f, OpusRangeCoder *rc)
|
||||
{
|
||||
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 *cap = f->caps;
|
||||
int boost[CELT_MAX_BANDS];
|
||||
int trim_offset[CELT_MAX_BANDS];
|
||||
int threshold[CELT_MAX_BANDS];
|
||||
int bits1[CELT_MAX_BANDS];
|
||||
int bits2[CELT_MAX_BANDS];
|
||||
|
||||
/* Tell the spread to the decoder */
|
||||
if (opus_rc_tell(rc) + 4 <= f->framebits)
|
||||
ff_opus_rc_enc_cdf(rc, f->spread, ff_celt_model_spread);
|
||||
else
|
||||
f->spread = CELT_SPREAD_NORMAL;
|
||||
|
||||
/* 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;
|
||||
}
|
||||
|
||||
/* Band boosts */
|
||||
tbits_8ths = f->framebits << 3;
|
||||
for (i = f->start_band; i < f->end_band; i++) {
|
||||
int quanta, b_dynalloc, boost_amount = f->alloc_boost[i];
|
||||
|
||||
boost[i] = 0;
|
||||
|
||||
quanta = ff_celt_freq_range[i] << (f->channels - 1) << f->size;
|
||||
quanta = FFMIN(quanta << 3, FFMAX(6 << 3, quanta));
|
||||
b_dynalloc = dynalloc;
|
||||
|
||||
while (opus_rc_tell_frac(rc) + (b_dynalloc << 3) < tbits_8ths && boost[i] < cap[i]) {
|
||||
int is_boost = boost_amount--;
|
||||
|
||||
ff_opus_rc_enc_log(rc, is_boost, b_dynalloc);
|
||||
if (!is_boost)
|
||||
break;
|
||||
|
||||
boost[i] += quanta;
|
||||
tbits_8ths -= quanta;
|
||||
|
||||
b_dynalloc = 1;
|
||||
}
|
||||
|
||||
if (boost[i])
|
||||
dynalloc = FFMAX(2, dynalloc - 1);
|
||||
}
|
||||
|
||||
/* Put allocation trim */
|
||||
if (opus_rc_tell_frac(rc) + (6 << 3) <= tbits_8ths)
|
||||
ff_opus_rc_enc_cdf(rc, f->alloc_trim, 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 = 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 > tbits_8ths)
|
||||
high = center - 1;
|
||||
else
|
||||
low = center + 1;
|
||||
}
|
||||
high = low--;
|
||||
|
||||
/* Bisection */
|
||||
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_startband = 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 > 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, 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_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]
|
||||
+ 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)) {
|
||||
const int do_not_skip = f->coded_bands <= f->skip_band_floor;
|
||||
ff_opus_rc_enc_log(rc, do_not_skip, 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;
|
||||
}
|
||||
|
||||
/* Encode stereo flags */
|
||||
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);
|
||||
}
|
||||
if (f->intensity_stereo <= f->start_band)
|
||||
tbits_8ths += dualstereo_bit; /* no intensity stereo means no dual stereo */
|
||||
else if (dualstereo_bit)
|
||||
ff_opus_rc_enc_log(rc, f->dual_stereo, 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++) {
|
||||
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 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_enc_quant_pfilter(OpusRangeCoder *rc, CeltFrame *f)
|
||||
{
|
||||
float gain = f->pf_gain;
|
||||
@ -794,11 +467,11 @@ static void celt_encode_frame(OpusEncContext *s, OpusRangeCoder *rc,
|
||||
ff_opus_rc_enc_log(rc, f->transient, 3);
|
||||
|
||||
/* Main encoding */
|
||||
celt_quant_coarse (f, rc, s->last_quantized_energy);
|
||||
celt_enc_tf (f, rc);
|
||||
ff_celt_enc_bitalloc(f, rc);
|
||||
celt_quant_fine (f, rc);
|
||||
ff_celt_quant_bands (f, rc);
|
||||
celt_quant_coarse (f, rc, s->last_quantized_energy);
|
||||
celt_enc_tf (f, rc);
|
||||
ff_celt_bitalloc (f, rc, 1);
|
||||
celt_quant_fine (f, rc);
|
||||
ff_celt_quant_bands(f, rc);
|
||||
|
||||
/* Anticollapse bit */
|
||||
if (f->anticollapse_needed)
|
||||
|
||||
@ -51,6 +51,4 @@ typedef struct OpusPacketInfo {
|
||||
int frames;
|
||||
} OpusPacketInfo;
|
||||
|
||||
void ff_celt_enc_bitalloc(CeltFrame *f, OpusRangeCoder *rc);
|
||||
|
||||
#endif /* AVCODEC_OPUSENC_H */
|
||||
|
||||
@ -366,7 +366,7 @@ static int bands_dist(OpusPsyContext *s, CeltFrame *f, float *total_dist)
|
||||
OpusRangeCoder dump;
|
||||
|
||||
ff_opus_rc_enc_init(&dump);
|
||||
ff_celt_enc_bitalloc(f, &dump);
|
||||
ff_celt_bitalloc(f, &dump, 1);
|
||||
|
||||
for (i = 0; i < CELT_MAX_BANDS; i++) {
|
||||
float bits = 0.0f;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user