150 lines
7.2 KiB
C
150 lines
7.2 KiB
C
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/*
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* Copyright (C) 2016 foo86
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_DCA_XLL_H
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#define AVCODEC_DCA_XLL_H
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#include "libavutil/common.h"
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#include "libavutil/mem.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "get_bits.h"
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#include "dca.h"
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#include "dcadsp.h"
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#include "dca_exss.h"
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#define DCA_XLL_CHSETS_MAX 3
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#define DCA_XLL_CHANNELS_MAX 8
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#define DCA_XLL_BANDS_MAX 2
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#define DCA_XLL_ADAPT_PRED_ORDER_MAX 16
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#define DCA_XLL_DECI_HISTORY_MAX 8
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#define DCA_XLL_DMIX_SCALES_MAX ((DCA_XLL_CHSETS_MAX - 1) * DCA_XLL_CHANNELS_MAX)
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#define DCA_XLL_DMIX_COEFFS_MAX (DCA_XLL_DMIX_SCALES_MAX * DCA_XLL_CHANNELS_MAX)
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#define DCA_XLL_PBR_BUFFER_MAX (240 << 10)
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#define DCA_XLL_SAMPLE_BUFFERS_MAX 3
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typedef struct DCAXllBand {
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int decor_enabled; ///< Pairwise channel decorrelation flag
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int orig_order[DCA_XLL_CHANNELS_MAX]; ///< Original channel order
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int decor_coeff[DCA_XLL_CHANNELS_MAX / 2]; ///< Pairwise channel coefficients
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int adapt_pred_order[DCA_XLL_CHANNELS_MAX]; ///< Adaptive predictor order
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int highest_pred_order; ///< Highest adaptive predictor order
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int fixed_pred_order[DCA_XLL_CHANNELS_MAX]; ///< Fixed predictor order
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int adapt_refl_coeff[DCA_XLL_CHANNELS_MAX][DCA_XLL_ADAPT_PRED_ORDER_MAX]; ///< Adaptive predictor reflection coefficients
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int dmix_embedded; ///< Downmix performed by encoder in frequency band
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int lsb_section_size; ///< Size of LSB section in any segment
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int nscalablelsbs[DCA_XLL_CHANNELS_MAX]; ///< Number of bits to represent the samples in LSB part
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int bit_width_adjust[DCA_XLL_CHANNELS_MAX]; ///< Number of bits discarded by authoring
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int32_t *msb_sample_buffer[DCA_XLL_CHANNELS_MAX]; ///< MSB sample buffer pointers
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int32_t *lsb_sample_buffer[DCA_XLL_CHANNELS_MAX]; ///< LSB sample buffer pointers or NULL
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} DCAXllBand;
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typedef struct DCAXllChSet {
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// Channel set header
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int nchannels; ///< Number of channels in the channel set (N)
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int residual_encode; ///< Residual encoding mask (0 - residual, 1 - full channel)
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int pcm_bit_res; ///< PCM bit resolution (variable)
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int storage_bit_res; ///< Storage bit resolution (16 or 24)
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int freq; ///< Original sampling frequency (max. 96000 Hz)
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int primary_chset; ///< Primary channel set flag
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int dmix_coeffs_present; ///< Downmix coefficients present in stream
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int dmix_embedded; ///< Downmix already performed by encoder
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int dmix_type; ///< Primary channel set downmix type
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int hier_chset; ///< Whether the channel set is part of a hierarchy
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int hier_ofs; ///< Number of preceding channels in a hierarchy (M)
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int dmix_coeff[DCA_XLL_DMIX_COEFFS_MAX]; ///< Downmixing coefficients
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int dmix_scale[DCA_XLL_DMIX_SCALES_MAX]; ///< Downmixing scales
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int dmix_scale_inv[DCA_XLL_DMIX_SCALES_MAX]; ///< Inverse downmixing scales
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int ch_mask; ///< Channel mask for set
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int ch_remap[DCA_XLL_CHANNELS_MAX]; ///< Channel to speaker map
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int nfreqbands; ///< Number of frequency bands (1 or 2)
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int nabits; ///< Number of bits to read bit allocation coding parameter
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DCAXllBand bands[DCA_XLL_BANDS_MAX]; ///< Frequency bands
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// Frequency band coding parameters
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int seg_common; ///< Segment type
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int rice_code_flag[DCA_XLL_CHANNELS_MAX]; ///< Rice coding flag
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int bitalloc_hybrid_linear[DCA_XLL_CHANNELS_MAX]; ///< Binary code length for isolated samples
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int bitalloc_part_a[DCA_XLL_CHANNELS_MAX]; ///< Coding parameter for part A of segment
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int bitalloc_part_b[DCA_XLL_CHANNELS_MAX]; ///< Coding parameter for part B of segment
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int nsamples_part_a[DCA_XLL_CHANNELS_MAX]; ///< Number of samples in part A of segment
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// Decimator history
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DECLARE_ALIGNED(32, int32_t, deci_history)[DCA_XLL_CHANNELS_MAX][DCA_XLL_DECI_HISTORY_MAX]; ///< Decimator history for frequency band 1
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// Sample buffers
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unsigned int sample_size[DCA_XLL_SAMPLE_BUFFERS_MAX];
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int32_t *sample_buffer[DCA_XLL_SAMPLE_BUFFERS_MAX];
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} DCAXllChSet;
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typedef struct DCAXllDecoder {
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AVCodecContext *avctx;
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GetBitContext gb;
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int frame_size; ///< Number of bytes in a lossless frame
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int nchsets; ///< Number of channels sets per frame
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int nframesegs; ///< Number of segments per frame
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int nsegsamples_log2; ///< log2(nsegsamples)
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int nsegsamples; ///< Samples in segment per one frequency band
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int nframesamples_log2; ///< log2(nframesamples)
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int nframesamples; ///< Samples in frame per one frequency band
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int seg_size_nbits; ///< Number of bits used to read segment size
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int band_crc_present; ///< Presence of CRC16 within each frequency band
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int scalable_lsbs; ///< MSB/LSB split flag
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int ch_mask_nbits; ///< Number of bits used to read channel mask
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int fixed_lsb_width; ///< Fixed LSB width
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DCAXllChSet chset[DCA_XLL_CHSETS_MAX]; ///< Channel sets
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int *navi; ///< NAVI table
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unsigned int navi_size;
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int nfreqbands; ///< Highest number of frequency bands
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int nchannels; ///< Total number of channels in a hierarchy
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int nreschsets; ///< Number of channel sets that have residual encoded channels
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int nactivechsets; ///< Number of active channel sets to decode
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int hd_stream_id; ///< Previous DTS-HD stream ID for detecting changes
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uint8_t *pbr_buffer; ///< Peak bit rate (PBR) smoothing buffer
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int pbr_length; ///< Length in bytes of data currently buffered
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int pbr_delay; ///< Delay in frames before decoding buffered data
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DCADSPContext *dcadsp;
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int output_mask;
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int32_t *output_samples[DCA_SPEAKER_COUNT];
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} DCAXllDecoder;
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int ff_dca_xll_parse(DCAXllDecoder *s, uint8_t *data, DCAExssAsset *asset);
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int ff_dca_xll_filter_frame(DCAXllDecoder *s, AVFrame *frame);
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av_cold void ff_dca_xll_flush(DCAXllDecoder *s);
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av_cold void ff_dca_xll_close(DCAXllDecoder *s);
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#endif
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