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@ -282,333 +282,6 @@ static void celt_enc_tf(CeltFrame *f, OpusRangeCoder *rc) |
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f->tf_change[i] = ff_celt_tf_select[f->size][f->transient][tf_select][f->tf_change[i]]; |
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} |
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void ff_celt_enc_bitalloc(CeltFrame *f, OpusRangeCoder *rc) |
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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 *cap = f->caps; |
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int boost[CELT_MAX_BANDS]; |
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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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/* Tell the spread to the decoder */ |
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if (opus_rc_tell(rc) + 4 <= f->framebits) |
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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 = CELT_SPREAD_NORMAL; |
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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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/* 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, b_dynalloc, boost_amount = f->alloc_boost[i]; |
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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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b_dynalloc = dynalloc; |
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while (opus_rc_tell_frac(rc) + (b_dynalloc << 3) < tbits_8ths && boost[i] < cap[i]) { |
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int is_boost = boost_amount--; |
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ff_opus_rc_enc_log(rc, is_boost, b_dynalloc); |
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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(2, dynalloc - 1); |
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} |
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/* Put allocation trim */ |
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if (opus_rc_tell_frac(rc) + (6 << 3) <= tbits_8ths) |
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ff_opus_rc_enc_cdf(rc, f->alloc_trim, 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 = ff_celt_freq_range[i] * ff_celt_static_alloc[center][i] |
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<< (f->channels - 1) << f->size >> 2; |
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if (bandbits) |
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bandbits = FFMAX(0, bandbits + trim_offset[i]); |
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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, cap[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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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] = ff_celt_freq_range[i] * ff_celt_static_alloc[low][i] |
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<< (f->channels - 1) << f->size >> 2; |
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bits2[i] = high >= CELT_VECTORS ? cap[i] : |
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ff_celt_freq_range[i] * ff_celt_static_alloc[high][i] |
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<< (f->channels - 1) << f->size >> 2; |
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if (bits1[i]) |
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bits1[i] = FFMAX(0, bits1[i] + trim_offset[i]); |
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if (bits2[i]) |
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bits2[i] = FFMAX(0, bits2[i] + trim_offset[i]); |
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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(0, bits2[i] - bits1[i]); |
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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, cap[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, cap[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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+ FFMAX(0, remaining - (ff_celt_freq_bands[j] - ff_celt_freq_bands[f->start_band])); |
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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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const int 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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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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/* Encode stereo flags */ |
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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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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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ff_opus_rc_enc_log(rc, f->dual_stereo, 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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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 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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int fine_bits, max_bits; |
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extrabits = FFMAX(0, f->pulses[i] - cap[i]); |
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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(0, f->pulses[i] - (f->channels << 3)); |
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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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static void celt_enc_quant_pfilter(OpusRangeCoder *rc, CeltFrame *f) |
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{ |
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float gain = f->pf_gain; |
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@ -794,11 +467,11 @@ static void celt_encode_frame(OpusEncContext *s, OpusRangeCoder *rc, |
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ff_opus_rc_enc_log(rc, f->transient, 3); |
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/* Main encoding */ |
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celt_quant_coarse (f, rc, s->last_quantized_energy); |
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celt_enc_tf (f, rc); |
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ff_celt_enc_bitalloc(f, rc); |
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celt_quant_fine (f, rc); |
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ff_celt_quant_bands (f, rc); |
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celt_quant_coarse (f, rc, s->last_quantized_energy); |
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celt_enc_tf (f, rc); |
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ff_celt_bitalloc (f, rc, 1); |
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celt_quant_fine (f, rc); |
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ff_celt_quant_bands(f, rc); |
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/* Anticollapse bit */ |
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if (f->anticollapse_needed) |
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Rostislav Pehlivanov
7 years ago