diff options
Diffstat (limited to 'libavcodec/opus.c')
| -rw-r--r-- | libavcodec/opus.c | 493 |
1 files changed, 485 insertions, 8 deletions
diff --git a/libavcodec/opus.c b/libavcodec/opus.c index 8e896dd..f74278a 100644 --- a/libavcodec/opus.c +++ b/libavcodec/opus.c @@ -2,20 +2,20 @@ * Copyright (c) 2012 Andrew D'Addesio * Copyright (c) 2013-2014 Mozilla Corporation * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -27,8 +27,11 @@ #include <stdint.h> #include "libavutil/error.h" +#include "libavutil/ffmath.h" -#include "opus.h" +#include "opus_celt.h" +#include "opustab.h" +#include "internal.h" #include "vorbis.h" static const uint16_t opus_frame_duration[32] = { @@ -324,16 +327,18 @@ av_cold int ff_opus_parse_extradata(AVCodecContext *avctx, } avctx->delay = AV_RL16(extradata + 10); + if (avctx->internal) + avctx->internal->skip_samples = avctx->delay; channels = avctx->extradata ? extradata[9] : (avctx->channels == 1) ? 1 : 2; if (!channels) { - av_log(avctx, AV_LOG_ERROR, "Zero channel count specified in the extadata\n"); + av_log(avctx, AV_LOG_ERROR, "Zero channel count specified in the extradata\n"); return AVERROR_INVALIDDATA; } s->gain_i = AV_RL16(extradata + 16); if (s->gain_i) - s->gain = pow(10, s->gain_i / (20.0 * 256)); + s->gain = ff_exp10(s->gain_i / (20.0 * 256)); map_type = extradata[18]; if (!map_type) { @@ -346,7 +351,7 @@ av_cold int ff_opus_parse_extradata(AVCodecContext *avctx, streams = 1; stereo_streams = channels - 1; channel_map = default_channel_map; - } else if (map_type == 1 || map_type == 255) { + } else if (map_type == 1 || map_type == 2 || map_type == 255) { if (extradata_size < 21 + channels) { av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n", extradata_size); @@ -370,6 +375,21 @@ av_cold int ff_opus_parse_extradata(AVCodecContext *avctx, } layout = ff_vorbis_channel_layouts[channels - 1]; channel_reorder = channel_reorder_vorbis; + } else if (map_type == 2) { + int ambisonic_order = ff_sqrt(channels) - 1; + if (channels != ((ambisonic_order + 1) * (ambisonic_order + 1)) && + channels != ((ambisonic_order + 1) * (ambisonic_order + 1) + 2)) { + av_log(avctx, AV_LOG_ERROR, + "Channel mapping 2 is only specified for channel counts" + " which can be written as (n + 1)^2 or (n + 1)^2 + 2" + " for nonnegative integer n\n"); + return AVERROR_INVALIDDATA; + } + if (channels > 227) { + av_log(avctx, AV_LOG_ERROR, "Too many channels\n"); + return AVERROR_INVALIDDATA; + } + layout = 0; } else layout = 0; @@ -393,6 +413,7 @@ av_cold int ff_opus_parse_extradata(AVCodecContext *avctx, } else if (idx >= streams + stereo_streams) { av_log(avctx, AV_LOG_ERROR, "Invalid channel map for output channel %d: %d\n", i, idx); + av_freep(&s->channel_maps); return AVERROR_INVALIDDATA; } @@ -421,3 +442,459 @@ av_cold int ff_opus_parse_extradata(AVCodecContext *avctx, return 0; } + +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 (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; + } +} |
