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* 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
* 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 "libavutil/common.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "internal.h"
#include "get_bits.h"
#include "dca.h"
#include "dcadsp.h"
#include "dca_exss.h"
#define DCA_XLL_PBR_BUFFER_MAX (240 << 10)
typedef struct DCAXllBand {
int decor_enabled; ///< Pairwise channel decorrelation flag
int orig_order[DCA_XLL_CHANNELS_MAX]; ///< Original channel order
int decor_coeff[DCA_XLL_CHANNELS_MAX / 2]; ///< Pairwise channel coefficients
int adapt_pred_order[DCA_XLL_CHANNELS_MAX]; ///< Adaptive predictor order
int highest_pred_order; ///< Highest adaptive predictor order
int fixed_pred_order[DCA_XLL_CHANNELS_MAX]; ///< Fixed predictor order
int adapt_refl_coeff[DCA_XLL_CHANNELS_MAX][DCA_XLL_ADAPT_PRED_ORDER_MAX]; ///< Adaptive predictor reflection coefficients
int dmix_embedded; ///< Downmix performed by encoder in frequency band
int lsb_section_size; ///< Size of LSB section in any segment
int nscalablelsbs[DCA_XLL_CHANNELS_MAX]; ///< Number of bits to represent the samples in LSB part
int bit_width_adjust[DCA_XLL_CHANNELS_MAX]; ///< Number of bits discarded by authoring
int32_t *msb_sample_buffer[DCA_XLL_CHANNELS_MAX]; ///< MSB sample buffer pointers
int32_t *lsb_sample_buffer[DCA_XLL_CHANNELS_MAX]; ///< LSB sample buffer pointers or NULL
} DCAXllBand;
typedef struct DCAXllChSet {
// Channel set header
int nchannels; ///< Number of channels in the channel set (N)
int residual_encode; ///< Residual encoding mask (0 - residual, 1 - full channel)
int pcm_bit_res; ///< PCM bit resolution (variable)
int storage_bit_res; ///< Storage bit resolution (16 or 24)
int freq; ///< Original sampling frequency (max. 96000 Hz)
int primary_chset; ///< Primary channel set flag
int dmix_coeffs_present; ///< Downmix coefficients present in stream
int dmix_embedded; ///< Downmix already performed by encoder
int dmix_type; ///< Primary channel set downmix type
int hier_chset; ///< Whether the channel set is part of a hierarchy
int hier_ofs; ///< Number of preceding channels in a hierarchy (M)
int dmix_coeff[DCA_XLL_DMIX_COEFFS_MAX]; ///< Downmixing coefficients
int dmix_scale[DCA_XLL_DMIX_SCALES_MAX]; ///< Downmixing scales
int dmix_scale_inv[DCA_XLL_DMIX_SCALES_MAX]; ///< Inverse downmixing scales
int ch_mask; ///< Channel mask for set
int ch_remap[DCA_XLL_CHANNELS_MAX]; ///< Channel to speaker map
int nfreqbands; ///< Number of frequency bands (1 or 2)
int nabits; ///< Number of bits to read bit allocation coding parameter
DCAXllBand bands[DCA_XLL_BANDS_MAX]; ///< Frequency bands
// Frequency band coding parameters
int seg_common; ///< Segment type
int rice_code_flag[DCA_XLL_CHANNELS_MAX]; ///< Rice coding flag
int bitalloc_hybrid_linear[DCA_XLL_CHANNELS_MAX]; ///< Binary code length for isolated samples
int bitalloc_part_a[DCA_XLL_CHANNELS_MAX]; ///< Coding parameter for part A of segment
int bitalloc_part_b[DCA_XLL_CHANNELS_MAX]; ///< Coding parameter for part B of segment
int nsamples_part_a[DCA_XLL_CHANNELS_MAX]; ///< Number of samples in part A of segment
// Decimator history
DECLARE_ALIGNED(32, int32_t, deci_history)[DCA_XLL_CHANNELS_MAX][DCA_XLL_DECI_HISTORY_MAX]; ///< Decimator history for frequency band 1
// Sample buffers
unsigned int sample_size[DCA_XLL_SAMPLE_BUFFERS_MAX];
int32_t *sample_buffer[DCA_XLL_SAMPLE_BUFFERS_MAX];
} DCAXllChSet;
typedef struct DCAXllDecoder {
AVCodecContext *avctx;
GetBitContext gb;
int frame_size; ///< Number of bytes in a lossless frame
int nchsets; ///< Number of channels sets per frame
int nframesegs; ///< Number of segments per frame
int nsegsamples_log2; ///< log2(nsegsamples)
int nsegsamples; ///< Samples in segment per one frequency band
int nframesamples_log2; ///< log2(nframesamples)
int nframesamples; ///< Samples in frame per one frequency band
int seg_size_nbits; ///< Number of bits used to read segment size
int band_crc_present; ///< Presence of CRC16 within each frequency band
int scalable_lsbs; ///< MSB/LSB split flag
int ch_mask_nbits; ///< Number of bits used to read channel mask
int fixed_lsb_width; ///< Fixed LSB width
DCAXllChSet chset[DCA_XLL_CHSETS_MAX]; ///< Channel sets
int *navi; ///< NAVI table
unsigned int navi_size;
int nfreqbands; ///< Highest number of frequency bands
int nchannels; ///< Total number of channels in a hierarchy
int nreschsets; ///< Number of channel sets that have residual encoded channels
int nactivechsets; ///< Number of active channel sets to decode
int hd_stream_id; ///< Previous DTS-HD stream ID for detecting changes
uint8_t *pbr_buffer; ///< Peak bit rate (PBR) smoothing buffer
int pbr_length; ///< Length in bytes of data currently buffered
int pbr_delay; ///< Delay in frames before decoding buffered data
DCADSPContext *dcadsp;
int output_mask;
int32_t *output_samples[DCA_SPEAKER_COUNT];
} DCAXllDecoder;
int ff_dca_xll_parse(DCAXllDecoder *s, uint8_t *data, DCAExssAsset *asset);
int ff_dca_xll_filter_frame(DCAXllDecoder *s, AVFrame *frame);
av_cold void ff_dca_xll_flush(DCAXllDecoder *s);
av_cold void ff_dca_xll_close(DCAXllDecoder *s);