| /* |
| * Copyright (C) 2016 foo86 |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "dcadec.h" |
| #include "dcadata.h" |
| #include "dcamath.h" |
| #include "dca_syncwords.h" |
| #include "unary.h" |
| |
| static int get_linear(GetBitContext *gb, int n) |
| { |
| unsigned int v = get_bits_long(gb, n); |
| return (v >> 1) ^ -(v & 1); |
| } |
| |
| static int get_rice_un(GetBitContext *gb, int k) |
| { |
| unsigned int v = get_unary(gb, 1, 128); |
| return (v << k) | get_bits_long(gb, k); |
| } |
| |
| static int get_rice(GetBitContext *gb, int k) |
| { |
| unsigned int v = get_rice_un(gb, k); |
| return (v >> 1) ^ -(v & 1); |
| } |
| |
| static void get_array(GetBitContext *gb, int32_t *array, int size, int n) |
| { |
| int i; |
| |
| for (i = 0; i < size; i++) |
| array[i] = get_bits(gb, n); |
| } |
| |
| static void get_linear_array(GetBitContext *gb, int32_t *array, int size, int n) |
| { |
| int i; |
| |
| if (n == 0) |
| memset(array, 0, sizeof(*array) * size); |
| else for (i = 0; i < size; i++) |
| array[i] = get_linear(gb, n); |
| } |
| |
| static void get_rice_array(GetBitContext *gb, int32_t *array, int size, int k) |
| { |
| int i; |
| |
| for (i = 0; i < size; i++) |
| array[i] = get_rice(gb, k); |
| } |
| |
| static int parse_dmix_coeffs(DCAXllDecoder *s, DCAXllChSet *c) |
| { |
| // Size of downmix coefficient matrix |
| int m = c->primary_chset ? ff_dca_dmix_primary_nch[c->dmix_type] : c->hier_ofs; |
| int i, j, *coeff_ptr = c->dmix_coeff; |
| |
| for (i = 0; i < m; i++) { |
| int code, sign, coeff, scale, scale_inv = 0; |
| unsigned int index; |
| |
| // Downmix scale (only for non-primary channel sets) |
| if (!c->primary_chset) { |
| code = get_bits(&s->gb, 9); |
| sign = (code >> 8) - 1; |
| index = (code & 0xff) - FF_DCA_DMIXTABLE_OFFSET; |
| if (index >= FF_DCA_INV_DMIXTABLE_SIZE) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid XLL downmix scale index\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| scale = ff_dca_dmixtable[index + FF_DCA_DMIXTABLE_OFFSET]; |
| scale_inv = ff_dca_inv_dmixtable[index]; |
| c->dmix_scale[i] = (scale ^ sign) - sign; |
| c->dmix_scale_inv[i] = (scale_inv ^ sign) - sign; |
| } |
| |
| // Downmix coefficients |
| for (j = 0; j < c->nchannels; j++) { |
| code = get_bits(&s->gb, 9); |
| sign = (code >> 8) - 1; |
| index = code & 0xff; |
| if (index >= FF_DCA_DMIXTABLE_SIZE) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid XLL downmix coefficient index\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| coeff = ff_dca_dmixtable[index]; |
| if (!c->primary_chset) |
| // Multiply by |InvDmixScale| to get |UndoDmixScale| |
| coeff = mul16(scale_inv, coeff); |
| *coeff_ptr++ = (coeff ^ sign) - sign; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int chs_parse_header(DCAXllDecoder *s, DCAXllChSet *c, DCAExssAsset *asset) |
| { |
| int i, j, k, ret, band, header_size, header_pos = get_bits_count(&s->gb); |
| DCAXllChSet *p = &s->chset[0]; |
| DCAXllBand *b; |
| |
| // Size of channel set sub-header |
| header_size = get_bits(&s->gb, 10) + 1; |
| |
| // Check CRC |
| if ((s->avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_CAREFUL)) |
| && ff_dca_check_crc(&s->gb, header_pos, header_pos + header_size * 8)) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid XLL sub-header checksum\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Number of channels in the channel set |
| c->nchannels = get_bits(&s->gb, 4) + 1; |
| if (c->nchannels > DCA_XLL_CHANNELS_MAX) { |
| avpriv_request_sample(s->avctx, "%d XLL channels", c->nchannels); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| // Residual type |
| c->residual_encode = get_bits(&s->gb, c->nchannels); |
| |
| // PCM bit resolution |
| c->pcm_bit_res = get_bits(&s->gb, 5) + 1; |
| |
| // Storage unit width |
| c->storage_bit_res = get_bits(&s->gb, 5) + 1; |
| if (c->storage_bit_res != 16 && c->storage_bit_res != 24) { |
| avpriv_request_sample(s->avctx, "%d-bit XLL storage resolution", c->storage_bit_res); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| if (c->pcm_bit_res > c->storage_bit_res) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid PCM bit resolution for XLL channel set (%d > %d)\n", c->pcm_bit_res, c->storage_bit_res); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Original sampling frequency |
| c->freq = ff_dca_sampling_freqs[get_bits(&s->gb, 4)]; |
| if (c->freq > 192000) { |
| avpriv_request_sample(s->avctx, "%d Hz XLL sampling frequency", c->freq); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| // Sampling frequency modifier |
| if (get_bits(&s->gb, 2)) { |
| avpriv_request_sample(s->avctx, "XLL sampling frequency modifier"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| // Which replacement set this channel set is member of |
| if (get_bits(&s->gb, 2)) { |
| avpriv_request_sample(s->avctx, "XLL replacement set"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| if (asset->one_to_one_map_ch_to_spkr) { |
| // Primary channel set flag |
| c->primary_chset = get_bits1(&s->gb); |
| if (c->primary_chset != (c == p)) { |
| av_log(s->avctx, AV_LOG_ERROR, "The first (and only) XLL channel set must be primary\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Downmix coefficients present in stream |
| c->dmix_coeffs_present = get_bits1(&s->gb); |
| |
| // Downmix already performed by encoder |
| c->dmix_embedded = c->dmix_coeffs_present && get_bits1(&s->gb); |
| |
| // Downmix type |
| if (c->dmix_coeffs_present && c->primary_chset) { |
| c->dmix_type = get_bits(&s->gb, 3); |
| if (c->dmix_type >= DCA_DMIX_TYPE_COUNT) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid XLL primary channel set downmix type\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| |
| // Whether the channel set is part of a hierarchy |
| c->hier_chset = get_bits1(&s->gb); |
| if (!c->hier_chset && s->nchsets != 1) { |
| avpriv_request_sample(s->avctx, "XLL channel set outside of hierarchy"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| // Downmix coefficients |
| if (c->dmix_coeffs_present && (ret = parse_dmix_coeffs(s, c)) < 0) |
| return ret; |
| |
| // Channel mask enabled |
| if (!get_bits1(&s->gb)) { |
| avpriv_request_sample(s->avctx, "Disabled XLL channel mask"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| // Channel mask for set |
| c->ch_mask = get_bits_long(&s->gb, s->ch_mask_nbits); |
| if (av_popcount(c->ch_mask) != c->nchannels) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid XLL channel mask\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Build the channel to speaker map |
| for (i = 0, j = 0; i < s->ch_mask_nbits; i++) |
| if (c->ch_mask & (1U << i)) |
| c->ch_remap[j++] = i; |
| } else { |
| // Mapping coeffs present flag |
| if (c->nchannels != 2 || s->nchsets != 1 || get_bits1(&s->gb)) { |
| avpriv_request_sample(s->avctx, "Custom XLL channel to speaker mapping"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| // Setup for LtRt decoding |
| c->primary_chset = 1; |
| c->dmix_coeffs_present = 0; |
| c->dmix_embedded = 0; |
| c->hier_chset = 0; |
| c->ch_mask = DCA_SPEAKER_LAYOUT_STEREO; |
| c->ch_remap[0] = DCA_SPEAKER_L; |
| c->ch_remap[1] = DCA_SPEAKER_R; |
| } |
| |
| if (c->freq > 96000) { |
| // Extra frequency bands flag |
| if (get_bits1(&s->gb)) { |
| avpriv_request_sample(s->avctx, "Extra XLL frequency bands"); |
| return AVERROR_PATCHWELCOME; |
| } |
| c->nfreqbands = 2; |
| } else { |
| c->nfreqbands = 1; |
| } |
| |
| // Set the sampling frequency to that of the first frequency band. |
| // Frequency will be doubled again after bands assembly. |
| c->freq >>= c->nfreqbands - 1; |
| |
| // Verify that all channel sets have the same audio characteristics |
| if (c != p && (c->nfreqbands != p->nfreqbands || c->freq != p->freq |
| || c->pcm_bit_res != p->pcm_bit_res |
| || c->storage_bit_res != p->storage_bit_res)) { |
| avpriv_request_sample(s->avctx, "Different XLL audio characteristics"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| // Determine number of bits to read bit allocation coding parameter |
| if (c->storage_bit_res > 16) |
| c->nabits = 5; |
| else if (c->storage_bit_res > 8) |
| c->nabits = 4; |
| else |
| c->nabits = 3; |
| |
| // Account for embedded downmix and decimator saturation |
| if ((s->nchsets > 1 || c->nfreqbands > 1) && c->nabits < 5) |
| c->nabits++; |
| |
| for (band = 0, b = c->bands; band < c->nfreqbands; band++, b++) { |
| // Pairwise channel decorrelation |
| if ((b->decor_enabled = get_bits1(&s->gb)) && c->nchannels > 1) { |
| int ch_nbits = av_ceil_log2(c->nchannels); |
| |
| // Original channel order |
| for (i = 0; i < c->nchannels; i++) { |
| b->orig_order[i] = get_bits(&s->gb, ch_nbits); |
| if (b->orig_order[i] >= c->nchannels) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid XLL original channel order\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| |
| // Pairwise channel coefficients |
| for (i = 0; i < c->nchannels / 2; i++) |
| b->decor_coeff[i] = get_bits1(&s->gb) ? get_linear(&s->gb, 7) : 0; |
| } else { |
| for (i = 0; i < c->nchannels; i++) |
| b->orig_order[i] = i; |
| for (i = 0; i < c->nchannels / 2; i++) |
| b->decor_coeff[i] = 0; |
| } |
| |
| // Adaptive predictor order |
| b->highest_pred_order = 0; |
| for (i = 0; i < c->nchannels; i++) { |
| b->adapt_pred_order[i] = get_bits(&s->gb, 4); |
| if (b->adapt_pred_order[i] > b->highest_pred_order) |
| b->highest_pred_order = b->adapt_pred_order[i]; |
| } |
| if (b->highest_pred_order > s->nsegsamples) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid XLL adaptive predicition order\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Fixed predictor order |
| for (i = 0; i < c->nchannels; i++) |
| b->fixed_pred_order[i] = b->adapt_pred_order[i] ? 0 : get_bits(&s->gb, 2); |
| |
| // Adaptive predictor quantized reflection coefficients |
| for (i = 0; i < c->nchannels; i++) { |
| for (j = 0; j < b->adapt_pred_order[i]; j++) { |
| k = get_linear(&s->gb, 8); |
| if (k == -128) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid XLL reflection coefficient index\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (k < 0) |
| b->adapt_refl_coeff[i][j] = -(int)ff_dca_xll_refl_coeff[-k]; |
| else |
| b->adapt_refl_coeff[i][j] = (int)ff_dca_xll_refl_coeff[ k]; |
| } |
| } |
| |
| // Downmix performed by encoder in extension frequency band |
| b->dmix_embedded = c->dmix_embedded && (band == 0 || get_bits1(&s->gb)); |
| |
| // MSB/LSB split flag in extension frequency band |
| if ((band == 0 && s->scalable_lsbs) || (band != 0 && get_bits1(&s->gb))) { |
| // Size of LSB section in any segment |
| b->lsb_section_size = get_bits_long(&s->gb, s->seg_size_nbits); |
| if (b->lsb_section_size < 0 || b->lsb_section_size > s->frame_size) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid LSB section size\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Account for optional CRC bytes after LSB section |
| if (b->lsb_section_size && (s->band_crc_present > 2 || |
| (band == 0 && s->band_crc_present > 1))) |
| b->lsb_section_size += 2; |
| |
| // Number of bits to represent the samples in LSB part |
| for (i = 0; i < c->nchannels; i++) { |
| b->nscalablelsbs[i] = get_bits(&s->gb, 4); |
| if (b->nscalablelsbs[i] && !b->lsb_section_size) { |
| av_log(s->avctx, AV_LOG_ERROR, "LSB section missing with non-zero LSB width\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| } else { |
| b->lsb_section_size = 0; |
| for (i = 0; i < c->nchannels; i++) |
| b->nscalablelsbs[i] = 0; |
| } |
| |
| // Scalable resolution flag in extension frequency band |
| if ((band == 0 && s->scalable_lsbs) || (band != 0 && get_bits1(&s->gb))) { |
| // Number of bits discarded by authoring |
| for (i = 0; i < c->nchannels; i++) |
| b->bit_width_adjust[i] = get_bits(&s->gb, 4); |
| } else { |
| for (i = 0; i < c->nchannels; i++) |
| b->bit_width_adjust[i] = 0; |
| } |
| } |
| |
| // Reserved |
| // Byte align |
| // CRC16 of channel set sub-header |
| if (ff_dca_seek_bits(&s->gb, header_pos + header_size * 8)) { |
| av_log(s->avctx, AV_LOG_ERROR, "Read past end of XLL sub-header\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| return 0; |
| } |
| |
| static int chs_alloc_msb_band_data(DCAXllDecoder *s, DCAXllChSet *c) |
| { |
| int ndecisamples = c->nfreqbands > 1 ? DCA_XLL_DECI_HISTORY_MAX : 0; |
| int nchsamples = s->nframesamples + ndecisamples; |
| int i, j, nsamples = nchsamples * c->nchannels * c->nfreqbands; |
| int32_t *ptr; |
| |
| // Reallocate MSB sample buffer |
| av_fast_malloc(&c->sample_buffer[0], &c->sample_size[0], nsamples * sizeof(int32_t)); |
| if (!c->sample_buffer[0]) |
| return AVERROR(ENOMEM); |
| |
| ptr = c->sample_buffer[0] + ndecisamples; |
| for (i = 0; i < c->nfreqbands; i++) { |
| for (j = 0; j < c->nchannels; j++) { |
| c->bands[i].msb_sample_buffer[j] = ptr; |
| ptr += nchsamples; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int chs_alloc_lsb_band_data(DCAXllDecoder *s, DCAXllChSet *c) |
| { |
| int i, j, nsamples = 0; |
| int32_t *ptr; |
| |
| // Determine number of frequency bands that have MSB/LSB split |
| for (i = 0; i < c->nfreqbands; i++) |
| if (c->bands[i].lsb_section_size) |
| nsamples += s->nframesamples * c->nchannels; |
| if (!nsamples) |
| return 0; |
| |
| // Reallocate LSB sample buffer |
| av_fast_malloc(&c->sample_buffer[1], &c->sample_size[1], nsamples * sizeof(int32_t)); |
| if (!c->sample_buffer[1]) |
| return AVERROR(ENOMEM); |
| |
| ptr = c->sample_buffer[1]; |
| for (i = 0; i < c->nfreqbands; i++) { |
| if (c->bands[i].lsb_section_size) { |
| for (j = 0; j < c->nchannels; j++) { |
| c->bands[i].lsb_sample_buffer[j] = ptr; |
| ptr += s->nframesamples; |
| } |
| } else { |
| for (j = 0; j < c->nchannels; j++) |
| c->bands[i].lsb_sample_buffer[j] = NULL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int chs_parse_band_data(DCAXllDecoder *s, DCAXllChSet *c, int band, int seg, int band_data_end) |
| { |
| DCAXllBand *b = &c->bands[band]; |
| int i, j, k; |
| |
| // Start unpacking MSB portion of the segment |
| if (!(seg && get_bits1(&s->gb))) { |
| // Unpack segment type |
| // 0 - distinct coding parameters for each channel |
| // 1 - common coding parameters for all channels |
| c->seg_common = get_bits1(&s->gb); |
| |
| // Determine number of coding parameters encoded in segment |
| k = c->seg_common ? 1 : c->nchannels; |
| |
| // Unpack Rice coding parameters |
| for (i = 0; i < k; i++) { |
| // Unpack Rice coding flag |
| // 0 - linear code, 1 - Rice code |
| c->rice_code_flag[i] = get_bits1(&s->gb); |
| if (!c->seg_common && c->rice_code_flag[i]) { |
| // Unpack Hybrid Rice coding flag |
| // 0 - Rice code, 1 - Hybrid Rice code |
| if (get_bits1(&s->gb)) |
| // Unpack binary code length for isolated samples |
| c->bitalloc_hybrid_linear[i] = get_bits(&s->gb, c->nabits) + 1; |
| else |
| // 0 indicates no Hybrid Rice coding |
| c->bitalloc_hybrid_linear[i] = 0; |
| } else { |
| // 0 indicates no Hybrid Rice coding |
| c->bitalloc_hybrid_linear[i] = 0; |
| } |
| } |
| |
| // Unpack coding parameters |
| for (i = 0; i < k; i++) { |
| if (seg == 0) { |
| // Unpack coding parameter for part A of segment 0 |
| c->bitalloc_part_a[i] = get_bits(&s->gb, c->nabits); |
| |
| // Adjust for the linear code |
| if (!c->rice_code_flag[i] && c->bitalloc_part_a[i]) |
| c->bitalloc_part_a[i]++; |
| |
| if (!c->seg_common) |
| c->nsamples_part_a[i] = b->adapt_pred_order[i]; |
| else |
| c->nsamples_part_a[i] = b->highest_pred_order; |
| } else { |
| c->bitalloc_part_a[i] = 0; |
| c->nsamples_part_a[i] = 0; |
| } |
| |
| // Unpack coding parameter for part B of segment |
| c->bitalloc_part_b[i] = get_bits(&s->gb, c->nabits); |
| |
| // Adjust for the linear code |
| if (!c->rice_code_flag[i] && c->bitalloc_part_b[i]) |
| c->bitalloc_part_b[i]++; |
| } |
| } |
| |
| // Unpack entropy codes |
| for (i = 0; i < c->nchannels; i++) { |
| int32_t *part_a, *part_b; |
| int nsamples_part_b; |
| |
| // Select index of coding parameters |
| k = c->seg_common ? 0 : i; |
| |
| // Slice the segment into parts A and B |
| part_a = b->msb_sample_buffer[i] + seg * s->nsegsamples; |
| part_b = part_a + c->nsamples_part_a[k]; |
| nsamples_part_b = s->nsegsamples - c->nsamples_part_a[k]; |
| |
| if (get_bits_left(&s->gb) < 0) |
| return AVERROR_INVALIDDATA; |
| |
| if (!c->rice_code_flag[k]) { |
| // Linear codes |
| // Unpack all residuals of part A of segment 0 |
| get_linear_array(&s->gb, part_a, c->nsamples_part_a[k], |
| c->bitalloc_part_a[k]); |
| |
| // Unpack all residuals of part B of segment 0 and others |
| get_linear_array(&s->gb, part_b, nsamples_part_b, |
| c->bitalloc_part_b[k]); |
| } else { |
| // Rice codes |
| // Unpack all residuals of part A of segment 0 |
| get_rice_array(&s->gb, part_a, c->nsamples_part_a[k], |
| c->bitalloc_part_a[k]); |
| |
| if (c->bitalloc_hybrid_linear[k]) { |
| // Hybrid Rice codes |
| // Unpack the number of isolated samples |
| int nisosamples = get_bits(&s->gb, s->nsegsamples_log2); |
| |
| // Set all locations to 0 |
| memset(part_b, 0, sizeof(*part_b) * nsamples_part_b); |
| |
| // Extract the locations of isolated samples and flag by -1 |
| for (j = 0; j < nisosamples; j++) { |
| int loc = get_bits(&s->gb, s->nsegsamples_log2); |
| if (loc >= nsamples_part_b) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid isolated sample location\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| part_b[loc] = -1; |
| } |
| |
| // Unpack all residuals of part B of segment 0 and others |
| for (j = 0; j < nsamples_part_b; j++) { |
| if (part_b[j]) |
| part_b[j] = get_linear(&s->gb, c->bitalloc_hybrid_linear[k]); |
| else |
| part_b[j] = get_rice(&s->gb, c->bitalloc_part_b[k]); |
| } |
| } else { |
| // Rice codes |
| // Unpack all residuals of part B of segment 0 and others |
| get_rice_array(&s->gb, part_b, nsamples_part_b, c->bitalloc_part_b[k]); |
| } |
| } |
| } |
| |
| // Unpack decimator history for frequency band 1 |
| if (seg == 0 && band == 1) { |
| int nbits = get_bits(&s->gb, 5) + 1; |
| for (i = 0; i < c->nchannels; i++) |
| for (j = 1; j < DCA_XLL_DECI_HISTORY_MAX; j++) |
| c->deci_history[i][j] = get_sbits_long(&s->gb, nbits); |
| } |
| |
| // Start unpacking LSB portion of the segment |
| if (b->lsb_section_size) { |
| // Skip to the start of LSB portion |
| if (ff_dca_seek_bits(&s->gb, band_data_end - b->lsb_section_size * 8)) { |
| av_log(s->avctx, AV_LOG_ERROR, "Read past end of XLL band data\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Unpack all LSB parts of residuals of this segment |
| for (i = 0; i < c->nchannels; i++) { |
| if (b->nscalablelsbs[i]) { |
| get_array(&s->gb, |
| b->lsb_sample_buffer[i] + seg * s->nsegsamples, |
| s->nsegsamples, b->nscalablelsbs[i]); |
| } |
| } |
| } |
| |
| // Skip to the end of band data |
| if (ff_dca_seek_bits(&s->gb, band_data_end)) { |
| av_log(s->avctx, AV_LOG_ERROR, "Read past end of XLL band data\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| return 0; |
| } |
| |
| static void av_cold chs_clear_band_data(DCAXllDecoder *s, DCAXllChSet *c, int band, int seg) |
| { |
| DCAXllBand *b = &c->bands[band]; |
| int i, offset, nsamples; |
| |
| if (seg < 0) { |
| offset = 0; |
| nsamples = s->nframesamples; |
| } else { |
| offset = seg * s->nsegsamples; |
| nsamples = s->nsegsamples; |
| } |
| |
| for (i = 0; i < c->nchannels; i++) { |
| memset(b->msb_sample_buffer[i] + offset, 0, nsamples * sizeof(int32_t)); |
| if (b->lsb_section_size) |
| memset(b->lsb_sample_buffer[i] + offset, 0, nsamples * sizeof(int32_t)); |
| } |
| |
| if (seg <= 0 && band) |
| memset(c->deci_history, 0, sizeof(c->deci_history)); |
| |
| if (seg < 0) { |
| memset(b->nscalablelsbs, 0, sizeof(b->nscalablelsbs)); |
| memset(b->bit_width_adjust, 0, sizeof(b->bit_width_adjust)); |
| } |
| } |
| |
| static void chs_filter_band_data(DCAXllDecoder *s, DCAXllChSet *c, int band) |
| { |
| DCAXllBand *b = &c->bands[band]; |
| int nsamples = s->nframesamples; |
| int i, j, k; |
| |
| // Inverse adaptive or fixed prediction |
| for (i = 0; i < c->nchannels; i++) { |
| int32_t *buf = b->msb_sample_buffer[i]; |
| int order = b->adapt_pred_order[i]; |
| if (order > 0) { |
| int coeff[DCA_XLL_ADAPT_PRED_ORDER_MAX]; |
| // Conversion from reflection coefficients to direct form coefficients |
| for (j = 0; j < order; j++) { |
| int rc = b->adapt_refl_coeff[i][j]; |
| for (k = 0; k < (j + 1) / 2; k++) { |
| int tmp1 = coeff[ k ]; |
| int tmp2 = coeff[j - k - 1]; |
| coeff[ k ] = tmp1 + mul16(rc, tmp2); |
| coeff[j - k - 1] = tmp2 + mul16(rc, tmp1); |
| } |
| coeff[j] = rc; |
| } |
| // Inverse adaptive prediction |
| for (j = 0; j < nsamples - order; j++) { |
| int64_t err = 0; |
| for (k = 0; k < order; k++) |
| err += (int64_t)buf[j + k] * coeff[order - k - 1]; |
| buf[j + k] -= clip23(norm16(err)); |
| } |
| } else { |
| // Inverse fixed coefficient prediction |
| for (j = 0; j < b->fixed_pred_order[i]; j++) |
| for (k = 1; k < nsamples; k++) |
| buf[k] += buf[k - 1]; |
| } |
| } |
| |
| // Inverse pairwise channel decorrellation |
| if (b->decor_enabled) { |
| int32_t *tmp[DCA_XLL_CHANNELS_MAX]; |
| |
| for (i = 0; i < c->nchannels / 2; i++) { |
| int coeff = b->decor_coeff[i]; |
| if (coeff) { |
| s->dcadsp->decor(b->msb_sample_buffer[i * 2 + 1], |
| b->msb_sample_buffer[i * 2 ], |
| coeff, nsamples); |
| } |
| } |
| |
| // Reorder channel pointers to the original order |
| for (i = 0; i < c->nchannels; i++) |
| tmp[i] = b->msb_sample_buffer[i]; |
| |
| for (i = 0; i < c->nchannels; i++) |
| b->msb_sample_buffer[b->orig_order[i]] = tmp[i]; |
| } |
| |
| // Map output channel pointers for frequency band 0 |
| if (c->nfreqbands == 1) |
| for (i = 0; i < c->nchannels; i++) |
| s->output_samples[c->ch_remap[i]] = b->msb_sample_buffer[i]; |
| } |
| |
| static int chs_get_lsb_width(DCAXllDecoder *s, DCAXllChSet *c, int band, int ch) |
| { |
| int adj = c->bands[band].bit_width_adjust[ch]; |
| int shift = c->bands[band].nscalablelsbs[ch]; |
| |
| if (s->fixed_lsb_width) |
| shift = s->fixed_lsb_width; |
| else if (shift && adj) |
| shift += adj - 1; |
| else |
| shift += adj; |
| |
| return shift; |
| } |
| |
| static void chs_assemble_msbs_lsbs(DCAXllDecoder *s, DCAXllChSet *c, int band) |
| { |
| DCAXllBand *b = &c->bands[band]; |
| int n, ch, nsamples = s->nframesamples; |
| |
| for (ch = 0; ch < c->nchannels; ch++) { |
| int shift = chs_get_lsb_width(s, c, band, ch); |
| if (shift) { |
| int32_t *msb = b->msb_sample_buffer[ch]; |
| if (b->nscalablelsbs[ch]) { |
| int32_t *lsb = b->lsb_sample_buffer[ch]; |
| int adj = b->bit_width_adjust[ch]; |
| for (n = 0; n < nsamples; n++) |
| msb[n] = msb[n] * (1 << shift) + (lsb[n] << adj); |
| } else { |
| for (n = 0; n < nsamples; n++) |
| msb[n] = msb[n] * (1 << shift); |
| } |
| } |
| } |
| } |
| |
| static int chs_assemble_freq_bands(DCAXllDecoder *s, DCAXllChSet *c) |
| { |
| int ch, nsamples = s->nframesamples; |
| int32_t *ptr; |
| |
| av_assert1(c->nfreqbands > 1); |
| |
| // Reallocate frequency band assembly buffer |
| av_fast_malloc(&c->sample_buffer[2], &c->sample_size[2], |
| 2 * nsamples * c->nchannels * sizeof(int32_t)); |
| if (!c->sample_buffer[2]) |
| return AVERROR(ENOMEM); |
| |
| // Assemble frequency bands 0 and 1 |
| ptr = c->sample_buffer[2]; |
| for (ch = 0; ch < c->nchannels; ch++) { |
| int32_t *band0 = c->bands[0].msb_sample_buffer[ch]; |
| int32_t *band1 = c->bands[1].msb_sample_buffer[ch]; |
| |
| // Copy decimator history |
| memcpy(band0 - DCA_XLL_DECI_HISTORY_MAX, |
| c->deci_history[ch], sizeof(c->deci_history[0])); |
| |
| // Filter |
| s->dcadsp->assemble_freq_bands(ptr, band0, band1, |
| ff_dca_xll_band_coeff, |
| nsamples); |
| |
| // Remap output channel pointer to assembly buffer |
| s->output_samples[c->ch_remap[ch]] = ptr; |
| ptr += nsamples * 2; |
| } |
| |
| return 0; |
| } |
| |
| static int parse_common_header(DCAXllDecoder *s) |
| { |
| int stream_ver, header_size, frame_size_nbits, nframesegs_log2; |
| |
| // XLL extension sync word |
| if (get_bits_long(&s->gb, 32) != DCA_SYNCWORD_XLL) { |
| av_log(s->avctx, AV_LOG_VERBOSE, "Invalid XLL sync word\n"); |
| return AVERROR(EAGAIN); |
| } |
| |
| // Version number |
| stream_ver = get_bits(&s->gb, 4) + 1; |
| if (stream_ver > 1) { |
| avpriv_request_sample(s->avctx, "XLL stream version %d", stream_ver); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| // Lossless frame header length |
| header_size = get_bits(&s->gb, 8) + 1; |
| |
| // Check CRC |
| if ((s->avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_CAREFUL)) |
| && ff_dca_check_crc(&s->gb, 32, header_size * 8)) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid XLL common header checksum\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Number of bits used to read frame size |
| frame_size_nbits = get_bits(&s->gb, 5) + 1; |
| |
| // Number of bytes in a lossless frame |
| s->frame_size = get_bits_long(&s->gb, frame_size_nbits); |
| if (s->frame_size < 0 || s->frame_size >= DCA_XLL_PBR_BUFFER_MAX) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid XLL frame size (%d bytes)\n", s->frame_size); |
| return AVERROR_INVALIDDATA; |
| } |
| s->frame_size++; |
| |
| // Number of channels sets per frame |
| s->nchsets = get_bits(&s->gb, 4) + 1; |
| if (s->nchsets > DCA_XLL_CHSETS_MAX) { |
| avpriv_request_sample(s->avctx, "%d XLL channel sets", s->nchsets); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| // Number of segments per frame |
| nframesegs_log2 = get_bits(&s->gb, 4); |
| s->nframesegs = 1 << nframesegs_log2; |
| if (s->nframesegs > 1024) { |
| av_log(s->avctx, AV_LOG_ERROR, "Too many segments per XLL frame\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Samples in segment per one frequency band for the first channel set |
| // Maximum value is 256 for sampling frequencies <= 48 kHz |
| // Maximum value is 512 for sampling frequencies > 48 kHz |
| s->nsegsamples_log2 = get_bits(&s->gb, 4); |
| if (!s->nsegsamples_log2) { |
| av_log(s->avctx, AV_LOG_ERROR, "Too few samples per XLL segment\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| s->nsegsamples = 1 << s->nsegsamples_log2; |
| if (s->nsegsamples > 512) { |
| av_log(s->avctx, AV_LOG_ERROR, "Too many samples per XLL segment\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Samples in frame per one frequency band for the first channel set |
| s->nframesamples_log2 = s->nsegsamples_log2 + nframesegs_log2; |
| s->nframesamples = 1 << s->nframesamples_log2; |
| if (s->nframesamples > 65536) { |
| av_log(s->avctx, AV_LOG_ERROR, "Too many samples per XLL frame\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Number of bits used to read segment size |
| s->seg_size_nbits = get_bits(&s->gb, 5) + 1; |
| |
| // Presence of CRC16 within each frequency band |
| // 0 - No CRC16 within band |
| // 1 - CRC16 placed at the end of MSB0 |
| // 2 - CRC16 placed at the end of MSB0 and LSB0 |
| // 3 - CRC16 placed at the end of MSB0 and LSB0 and other frequency bands |
| s->band_crc_present = get_bits(&s->gb, 2); |
| |
| // MSB/LSB split flag |
| s->scalable_lsbs = get_bits1(&s->gb); |
| |
| // Channel position mask |
| s->ch_mask_nbits = get_bits(&s->gb, 5) + 1; |
| |
| // Fixed LSB width |
| if (s->scalable_lsbs) |
| s->fixed_lsb_width = get_bits(&s->gb, 4); |
| else |
| s->fixed_lsb_width = 0; |
| |
| // Reserved |
| // Byte align |
| // Header CRC16 protection |
| if (ff_dca_seek_bits(&s->gb, header_size * 8)) { |
| av_log(s->avctx, AV_LOG_ERROR, "Read past end of XLL common header\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| return 0; |
| } |
| |
| static int is_hier_dmix_chset(DCAXllChSet *c) |
| { |
| return !c->primary_chset && c->dmix_embedded && c->hier_chset; |
| } |
| |
| static DCAXllChSet *find_next_hier_dmix_chset(DCAXllDecoder *s, DCAXllChSet *c) |
| { |
| if (c->hier_chset) |
| while (++c < &s->chset[s->nchsets]) |
| if (is_hier_dmix_chset(c)) |
| return c; |
| |
| return NULL; |
| } |
| |
| static void prescale_down_mix(DCAXllChSet *c, DCAXllChSet *o) |
| { |
| int i, j, *coeff_ptr = c->dmix_coeff; |
| |
| for (i = 0; i < c->hier_ofs; i++) { |
| int scale = o->dmix_scale[i]; |
| int scale_inv = o->dmix_scale_inv[i]; |
| c->dmix_scale[i] = mul15(c->dmix_scale[i], scale); |
| c->dmix_scale_inv[i] = mul16(c->dmix_scale_inv[i], scale_inv); |
| for (j = 0; j < c->nchannels; j++) { |
| int coeff = mul16(*coeff_ptr, scale_inv); |
| *coeff_ptr++ = mul15(coeff, o->dmix_scale[c->hier_ofs + j]); |
| } |
| } |
| } |
| |
| static int parse_sub_headers(DCAXllDecoder *s, DCAExssAsset *asset) |
| { |
| DCAContext *dca = s->avctx->priv_data; |
| DCAXllChSet *c; |
| int i, ret; |
| |
| // Parse channel set headers |
| s->nfreqbands = 0; |
| s->nchannels = 0; |
| s->nreschsets = 0; |
| for (i = 0, c = s->chset; i < s->nchsets; i++, c++) { |
| c->hier_ofs = s->nchannels; |
| if ((ret = chs_parse_header(s, c, asset)) < 0) |
| return ret; |
| if (c->nfreqbands > s->nfreqbands) |
| s->nfreqbands = c->nfreqbands; |
| if (c->hier_chset) |
| s->nchannels += c->nchannels; |
| if (c->residual_encode != (1 << c->nchannels) - 1) |
| s->nreschsets++; |
| } |
| |
| // Pre-scale downmixing coefficients for all non-primary channel sets |
| for (i = s->nchsets - 1, c = &s->chset[i]; i > 0; i--, c--) { |
| if (is_hier_dmix_chset(c)) { |
| DCAXllChSet *o = find_next_hier_dmix_chset(s, c); |
| if (o) |
| prescale_down_mix(c, o); |
| } |
| } |
| |
| // Determine number of active channel sets to decode |
| switch (dca->request_channel_layout) { |
| case DCA_SPEAKER_LAYOUT_STEREO: |
| s->nactivechsets = 1; |
| break; |
| case DCA_SPEAKER_LAYOUT_5POINT0: |
| case DCA_SPEAKER_LAYOUT_5POINT1: |
| s->nactivechsets = (s->chset[0].nchannels < 5 && s->nchsets > 1) ? 2 : 1; |
| break; |
| default: |
| s->nactivechsets = s->nchsets; |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int parse_navi_table(DCAXllDecoder *s) |
| { |
| int chs, seg, band, navi_nb, navi_pos, *navi_ptr; |
| DCAXllChSet *c; |
| |
| // Determine size of NAVI table |
| navi_nb = s->nfreqbands * s->nframesegs * s->nchsets; |
| if (navi_nb > 1024) { |
| av_log(s->avctx, AV_LOG_ERROR, "Too many NAVI entries (%d)\n", navi_nb); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Reallocate NAVI table |
| av_fast_malloc(&s->navi, &s->navi_size, navi_nb * sizeof(*s->navi)); |
| if (!s->navi) |
| return AVERROR(ENOMEM); |
| |
| // Parse NAVI |
| navi_pos = get_bits_count(&s->gb); |
| navi_ptr = s->navi; |
| for (band = 0; band < s->nfreqbands; band++) { |
| for (seg = 0; seg < s->nframesegs; seg++) { |
| for (chs = 0, c = s->chset; chs < s->nchsets; chs++, c++) { |
| int size = 0; |
| if (c->nfreqbands > band) { |
| size = get_bits_long(&s->gb, s->seg_size_nbits); |
| if (size < 0 || size >= s->frame_size) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid NAVI segment size (%d bytes)\n", size); |
| return AVERROR_INVALIDDATA; |
| } |
| size++; |
| } |
| *navi_ptr++ = size; |
| } |
| } |
| } |
| |
| // Byte align |
| // CRC16 |
| skip_bits(&s->gb, -get_bits_count(&s->gb) & 7); |
| skip_bits(&s->gb, 16); |
| |
| // Check CRC |
| if ((s->avctx->err_recognition & (AV_EF_CRCCHECK | AV_EF_CAREFUL)) |
| && ff_dca_check_crc(&s->gb, navi_pos, get_bits_count(&s->gb))) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid NAVI checksum\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| return 0; |
| } |
| |
| static int parse_band_data(DCAXllDecoder *s) |
| { |
| int ret, chs, seg, band, navi_pos, *navi_ptr; |
| DCAXllChSet *c; |
| |
| for (chs = 0, c = s->chset; chs < s->nactivechsets; chs++, c++) { |
| if ((ret = chs_alloc_msb_band_data(s, c)) < 0) |
| return ret; |
| if ((ret = chs_alloc_lsb_band_data(s, c)) < 0) |
| return ret; |
| } |
| |
| navi_pos = get_bits_count(&s->gb); |
| navi_ptr = s->navi; |
| for (band = 0; band < s->nfreqbands; band++) { |
| for (seg = 0; seg < s->nframesegs; seg++) { |
| for (chs = 0, c = s->chset; chs < s->nchsets; chs++, c++) { |
| if (c->nfreqbands > band) { |
| navi_pos += *navi_ptr * 8; |
| if (navi_pos > s->gb.size_in_bits) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid NAVI position\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (chs < s->nactivechsets && |
| (ret = chs_parse_band_data(s, c, band, seg, navi_pos)) < 0) { |
| if (s->avctx->err_recognition & AV_EF_EXPLODE) |
| return ret; |
| chs_clear_band_data(s, c, band, seg); |
| } |
| s->gb.index = navi_pos; |
| } |
| navi_ptr++; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int parse_frame(DCAXllDecoder *s, uint8_t *data, int size, DCAExssAsset *asset) |
| { |
| int ret; |
| |
| if ((ret = init_get_bits8(&s->gb, data, size)) < 0) |
| return ret; |
| if ((ret = parse_common_header(s)) < 0) |
| return ret; |
| if ((ret = parse_sub_headers(s, asset)) < 0) |
| return ret; |
| if ((ret = parse_navi_table(s)) < 0) |
| return ret; |
| if ((ret = parse_band_data(s)) < 0) |
| return ret; |
| if (ff_dca_seek_bits(&s->gb, s->frame_size * 8)) { |
| av_log(s->avctx, AV_LOG_ERROR, "Read past end of XLL frame\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| return ret; |
| } |
| |
| static void clear_pbr(DCAXllDecoder *s) |
| { |
| s->pbr_length = 0; |
| s->pbr_delay = 0; |
| } |
| |
| static int copy_to_pbr(DCAXllDecoder *s, uint8_t *data, int size, int delay) |
| { |
| if (size > DCA_XLL_PBR_BUFFER_MAX) |
| return AVERROR(ENOSPC); |
| |
| if (!s->pbr_buffer && !(s->pbr_buffer = av_malloc(DCA_XLL_PBR_BUFFER_MAX + DCA_BUFFER_PADDING_SIZE))) |
| return AVERROR(ENOMEM); |
| |
| memcpy(s->pbr_buffer, data, size); |
| s->pbr_length = size; |
| s->pbr_delay = delay; |
| return 0; |
| } |
| |
| static int parse_frame_no_pbr(DCAXllDecoder *s, uint8_t *data, int size, DCAExssAsset *asset) |
| { |
| int ret = parse_frame(s, data, size, asset); |
| |
| // If XLL packet data didn't start with a sync word, we must have jumped |
| // right into the middle of PBR smoothing period |
| if (ret == AVERROR(EAGAIN) && asset->xll_sync_present && asset->xll_sync_offset < size) { |
| // Skip to the next sync word in this packet |
| data += asset->xll_sync_offset; |
| size -= asset->xll_sync_offset; |
| |
| // If decoding delay is set, put the frame into PBR buffer and return |
| // failure code. Higher level decoder is expected to switch to lossy |
| // core decoding or mute its output until decoding delay expires. |
| if (asset->xll_delay_nframes > 0) { |
| if ((ret = copy_to_pbr(s, data, size, asset->xll_delay_nframes)) < 0) |
| return ret; |
| return AVERROR(EAGAIN); |
| } |
| |
| // No decoding delay, just parse the frame in place |
| ret = parse_frame(s, data, size, asset); |
| } |
| |
| if (ret < 0) |
| return ret; |
| |
| if (s->frame_size > size) |
| return AVERROR(EINVAL); |
| |
| // If the XLL decoder didn't consume full packet, start PBR smoothing period |
| if (s->frame_size < size) |
| if ((ret = copy_to_pbr(s, data + s->frame_size, size - s->frame_size, 0)) < 0) |
| return ret; |
| |
| return 0; |
| } |
| |
| static int parse_frame_pbr(DCAXllDecoder *s, uint8_t *data, int size, DCAExssAsset *asset) |
| { |
| int ret; |
| |
| if (size > DCA_XLL_PBR_BUFFER_MAX - s->pbr_length) { |
| ret = AVERROR(ENOSPC); |
| goto fail; |
| } |
| |
| memcpy(s->pbr_buffer + s->pbr_length, data, size); |
| s->pbr_length += size; |
| |
| // Respect decoding delay after synchronization error |
| if (s->pbr_delay > 0 && --s->pbr_delay) |
| return AVERROR(EAGAIN); |
| |
| if ((ret = parse_frame(s, s->pbr_buffer, s->pbr_length, asset)) < 0) |
| goto fail; |
| |
| if (s->frame_size > s->pbr_length) { |
| ret = AVERROR(EINVAL); |
| goto fail; |
| } |
| |
| if (s->frame_size == s->pbr_length) { |
| // End of PBR smoothing period |
| clear_pbr(s); |
| } else { |
| s->pbr_length -= s->frame_size; |
| memmove(s->pbr_buffer, s->pbr_buffer + s->frame_size, s->pbr_length); |
| } |
| |
| return 0; |
| |
| fail: |
| // For now, throw out all PBR state on failure. |
| // Perhaps we can be smarter and try to resync somehow. |
| clear_pbr(s); |
| return ret; |
| } |
| |
| int ff_dca_xll_parse(DCAXllDecoder *s, uint8_t *data, DCAExssAsset *asset) |
| { |
| int ret; |
| |
| if (s->hd_stream_id != asset->hd_stream_id) { |
| clear_pbr(s); |
| s->hd_stream_id = asset->hd_stream_id; |
| } |
| |
| if (s->pbr_length) |
| ret = parse_frame_pbr(s, data + asset->xll_offset, asset->xll_size, asset); |
| else |
| ret = parse_frame_no_pbr(s, data + asset->xll_offset, asset->xll_size, asset); |
| |
| return ret; |
| } |
| |
| static void undo_down_mix(DCAXllDecoder *s, DCAXllChSet *o, int band) |
| { |
| int i, j, k, nchannels = 0, *coeff_ptr = o->dmix_coeff; |
| DCAXllChSet *c; |
| |
| for (i = 0, c = s->chset; i < s->nactivechsets; i++, c++) { |
| if (!c->hier_chset) |
| continue; |
| |
| av_assert1(band < c->nfreqbands); |
| for (j = 0; j < c->nchannels; j++) { |
| for (k = 0; k < o->nchannels; k++) { |
| int coeff = *coeff_ptr++; |
| if (coeff) { |
| s->dcadsp->dmix_sub(c->bands[band].msb_sample_buffer[j], |
| o->bands[band].msb_sample_buffer[k], |
| coeff, s->nframesamples); |
| if (band) |
| s->dcadsp->dmix_sub(c->deci_history[j], |
| o->deci_history[k], |
| coeff, DCA_XLL_DECI_HISTORY_MAX); |
| } |
| } |
| } |
| |
| nchannels += c->nchannels; |
| if (nchannels >= o->hier_ofs) |
| break; |
| } |
| } |
| |
| static void scale_down_mix(DCAXllDecoder *s, DCAXllChSet *o, int band) |
| { |
| int i, j, nchannels = 0; |
| DCAXllChSet *c; |
| |
| for (i = 0, c = s->chset; i < s->nactivechsets; i++, c++) { |
| if (!c->hier_chset) |
| continue; |
| |
| av_assert1(band < c->nfreqbands); |
| for (j = 0; j < c->nchannels; j++) { |
| int scale = o->dmix_scale[nchannels++]; |
| if (scale != (1 << 15)) { |
| s->dcadsp->dmix_scale(c->bands[band].msb_sample_buffer[j], |
| scale, s->nframesamples); |
| if (band) |
| s->dcadsp->dmix_scale(c->deci_history[j], |
| scale, DCA_XLL_DECI_HISTORY_MAX); |
| } |
| } |
| |
| if (nchannels >= o->hier_ofs) |
| break; |
| } |
| } |
| |
| // Clear all band data and replace non-residual encoded channels with lossy |
| // counterparts |
| static void av_cold force_lossy_output(DCAXllDecoder *s, DCAXllChSet *c) |
| { |
| DCAContext *dca = s->avctx->priv_data; |
| int band, ch; |
| |
| for (band = 0; band < c->nfreqbands; band++) |
| chs_clear_band_data(s, c, band, -1); |
| |
| for (ch = 0; ch < c->nchannels; ch++) { |
| if (!(c->residual_encode & (1 << ch))) |
| continue; |
| if (ff_dca_core_map_spkr(&dca->core, c->ch_remap[ch]) < 0) |
| continue; |
| c->residual_encode &= ~(1 << ch); |
| } |
| } |
| |
| static int combine_residual_frame(DCAXllDecoder *s, DCAXllChSet *c) |
| { |
| DCAContext *dca = s->avctx->priv_data; |
| int ch, nsamples = s->nframesamples; |
| DCAXllChSet *o; |
| |
| // Verify that core is compatible |
| if (!(dca->packet & DCA_PACKET_CORE)) { |
| av_log(s->avctx, AV_LOG_ERROR, "Residual encoded channels are present without core\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| if (c->freq != dca->core.output_rate) { |
| av_log(s->avctx, AV_LOG_WARNING, "Sample rate mismatch between core (%d Hz) and XLL (%d Hz)\n", dca->core.output_rate, c->freq); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (nsamples != dca->core.npcmsamples) { |
| av_log(s->avctx, AV_LOG_WARNING, "Number of samples per frame mismatch between core (%d) and XLL (%d)\n", dca->core.npcmsamples, nsamples); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // See if this channel set is downmixed and find the next channel set in |
| // hierarchy. If downmixed, undo core pre-scaling before combining with |
| // residual (residual is not scaled). |
| o = find_next_hier_dmix_chset(s, c); |
| |
| // Reduce core bit width and combine with residual |
| for (ch = 0; ch < c->nchannels; ch++) { |
| int n, spkr, shift, round; |
| int32_t *src, *dst; |
| |
| if (c->residual_encode & (1 << ch)) |
| continue; |
| |
| // Map this channel to core speaker |
| spkr = ff_dca_core_map_spkr(&dca->core, c->ch_remap[ch]); |
| if (spkr < 0) { |
| av_log(s->avctx, AV_LOG_WARNING, "Residual encoded channel (%d) references unavailable core channel\n", c->ch_remap[ch]); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| // Account for LSB width |
| shift = 24 - c->pcm_bit_res + chs_get_lsb_width(s, c, 0, ch); |
| if (shift > 24) { |
| av_log(s->avctx, AV_LOG_WARNING, "Invalid core shift (%d bits)\n", shift); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| round = shift > 0 ? 1 << (shift - 1) : 0; |
| |
| src = dca->core.output_samples[spkr]; |
| dst = c->bands[0].msb_sample_buffer[ch]; |
| if (o) { |
| // Undo embedded core downmix pre-scaling |
| int scale_inv = o->dmix_scale_inv[c->hier_ofs + ch]; |
| for (n = 0; n < nsamples; n++) |
| dst[n] += clip23((mul16(src[n], scale_inv) + round) >> shift); |
| } else { |
| // No downmix scaling |
| for (n = 0; n < nsamples; n++) |
| dst[n] += (src[n] + round) >> shift; |
| } |
| } |
| |
| return 0; |
| } |
| |
| int ff_dca_xll_filter_frame(DCAXllDecoder *s, AVFrame *frame) |
| { |
| AVCodecContext *avctx = s->avctx; |
| DCAContext *dca = avctx->priv_data; |
| DCAExssAsset *asset = &dca->exss.assets[0]; |
| DCAXllChSet *p = &s->chset[0], *c; |
| enum AVMatrixEncoding matrix_encoding = AV_MATRIX_ENCODING_NONE; |
| int i, j, k, ret, shift, nsamples, request_mask; |
| int ch_remap[DCA_SPEAKER_COUNT]; |
| |
| // Force lossy downmixed output during recovery |
| if (dca->packet & DCA_PACKET_RECOVERY) { |
| for (i = 0, c = s->chset; i < s->nchsets; i++, c++) { |
| if (i < s->nactivechsets) |
| force_lossy_output(s, c); |
| |
| if (!c->primary_chset) |
| c->dmix_embedded = 0; |
| } |
| |
| s->scalable_lsbs = 0; |
| s->fixed_lsb_width = 0; |
| } |
| |
| // Filter frequency bands for active channel sets |
| s->output_mask = 0; |
| for (i = 0, c = s->chset; i < s->nactivechsets; i++, c++) { |
| chs_filter_band_data(s, c, 0); |
| |
| if (c->residual_encode != (1 << c->nchannels) - 1 |
| && (ret = combine_residual_frame(s, c)) < 0) |
| return ret; |
| |
| if (s->scalable_lsbs) |
| chs_assemble_msbs_lsbs(s, c, 0); |
| |
| if (c->nfreqbands > 1) { |
| chs_filter_band_data(s, c, 1); |
| chs_assemble_msbs_lsbs(s, c, 1); |
| } |
| |
| s->output_mask |= c->ch_mask; |
| } |
| |
| // Undo hierarchial downmix and/or apply scaling |
| for (i = 1, c = &s->chset[1]; i < s->nchsets; i++, c++) { |
| if (!is_hier_dmix_chset(c)) |
| continue; |
| |
| if (i >= s->nactivechsets) { |
| for (j = 0; j < c->nfreqbands; j++) |
| if (c->bands[j].dmix_embedded) |
| scale_down_mix(s, c, j); |
| break; |
| } |
| |
| for (j = 0; j < c->nfreqbands; j++) |
| if (c->bands[j].dmix_embedded) |
| undo_down_mix(s, c, j); |
| } |
| |
| // Assemble frequency bands for active channel sets |
| if (s->nfreqbands > 1) { |
| for (i = 0; i < s->nactivechsets; i++) |
| if ((ret = chs_assemble_freq_bands(s, &s->chset[i])) < 0) |
| return ret; |
| } |
| |
| // Normalize to regular 5.1 layout if downmixing |
| if (dca->request_channel_layout) { |
| if (s->output_mask & DCA_SPEAKER_MASK_Lss) { |
| s->output_samples[DCA_SPEAKER_Ls] = s->output_samples[DCA_SPEAKER_Lss]; |
| s->output_mask = (s->output_mask & ~DCA_SPEAKER_MASK_Lss) | DCA_SPEAKER_MASK_Ls; |
| } |
| if (s->output_mask & DCA_SPEAKER_MASK_Rss) { |
| s->output_samples[DCA_SPEAKER_Rs] = s->output_samples[DCA_SPEAKER_Rss]; |
| s->output_mask = (s->output_mask & ~DCA_SPEAKER_MASK_Rss) | DCA_SPEAKER_MASK_Rs; |
| } |
| } |
| |
| // Handle downmixing to stereo request |
| if (dca->request_channel_layout == DCA_SPEAKER_LAYOUT_STEREO |
| && DCA_HAS_STEREO(s->output_mask) && p->dmix_embedded |
| && (p->dmix_type == DCA_DMIX_TYPE_LoRo || |
| p->dmix_type == DCA_DMIX_TYPE_LtRt)) |
| request_mask = DCA_SPEAKER_LAYOUT_STEREO; |
| else |
| request_mask = s->output_mask; |
| if (!ff_dca_set_channel_layout(avctx, ch_remap, request_mask)) |
| return AVERROR(EINVAL); |
| |
| avctx->sample_rate = p->freq << (s->nfreqbands - 1); |
| |
| switch (p->storage_bit_res) { |
| case 16: |
| avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
| break; |
| case 24: |
| avctx->sample_fmt = AV_SAMPLE_FMT_S32P; |
| break; |
| default: |
| return AVERROR(EINVAL); |
| } |
| |
| avctx->bits_per_raw_sample = p->storage_bit_res; |
| avctx->profile = FF_PROFILE_DTS_HD_MA; |
| avctx->bit_rate = 0; |
| |
| frame->nb_samples = nsamples = s->nframesamples << (s->nfreqbands - 1); |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| return ret; |
| |
| // Downmix primary channel set to stereo |
| if (request_mask != s->output_mask) { |
| ff_dca_downmix_to_stereo_fixed(s->dcadsp, s->output_samples, |
| p->dmix_coeff, nsamples, |
| s->output_mask); |
| } |
| |
| shift = p->storage_bit_res - p->pcm_bit_res; |
| for (i = 0; i < avctx->channels; i++) { |
| int32_t *samples = s->output_samples[ch_remap[i]]; |
| if (frame->format == AV_SAMPLE_FMT_S16P) { |
| int16_t *plane = (int16_t *)frame->extended_data[i]; |
| for (k = 0; k < nsamples; k++) |
| plane[k] = av_clip_int16(samples[k] * (1 << shift)); |
| } else { |
| int32_t *plane = (int32_t *)frame->extended_data[i]; |
| for (k = 0; k < nsamples; k++) |
| plane[k] = clip23(samples[k] * (1 << shift)) * (1 << 8); |
| } |
| } |
| |
| if (!asset->one_to_one_map_ch_to_spkr) { |
| if (asset->representation_type == DCA_REPR_TYPE_LtRt) |
| matrix_encoding = AV_MATRIX_ENCODING_DOLBY; |
| else if (asset->representation_type == DCA_REPR_TYPE_LhRh) |
| matrix_encoding = AV_MATRIX_ENCODING_DOLBYHEADPHONE; |
| } else if (request_mask != s->output_mask && p->dmix_type == DCA_DMIX_TYPE_LtRt) { |
| matrix_encoding = AV_MATRIX_ENCODING_DOLBY; |
| } |
| if ((ret = ff_side_data_update_matrix_encoding(frame, matrix_encoding)) < 0) |
| return ret; |
| |
| return 0; |
| } |
| |
| av_cold void ff_dca_xll_flush(DCAXllDecoder *s) |
| { |
| clear_pbr(s); |
| } |
| |
| av_cold void ff_dca_xll_close(DCAXllDecoder *s) |
| { |
| DCAXllChSet *c; |
| int i, j; |
| |
| for (i = 0, c = s->chset; i < DCA_XLL_CHSETS_MAX; i++, c++) { |
| for (j = 0; j < DCA_XLL_SAMPLE_BUFFERS_MAX; j++) { |
| av_freep(&c->sample_buffer[j]); |
| c->sample_size[j] = 0; |
| } |
| } |
| |
| av_freep(&s->navi); |
| s->navi_size = 0; |
| |
| av_freep(&s->pbr_buffer); |
| clear_pbr(s); |
| } |
