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ffmpeg/libavcodec/dca.h

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/*
* DCA compatible decoder
* Copyright (C) 2004 Gildas Bazin
* Copyright (C) 2004 Benjamin Zores
* Copyright (C) 2006 Benjamin Larsson
* Copyright (C) 2007 Konstantin Shishkov
*
* This file is part of Libav.
*
* Libav 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,
* 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_DCA_H
#define AVCODEC_DCA_H
#include <stdint.h>
#include "libavutil/float_dsp.h"
#include "libavutil/internal.h"
#include "avcodec.h"
#include "dcadsp.h"
#include "fmtconvert.h"
#include "get_bits.h"
#define DCA_PRIM_CHANNELS_MAX (7)
#define DCA_ABITS_MAX (32) /* Should be 28 */
#define DCA_SUBSUBFRAMES_MAX (4)
#define DCA_SUBFRAMES_MAX (16)
#define DCA_BLOCKS_MAX (16)
#define DCA_LFE_MAX (3)
#define DCA_PRIM_CHANNELS_MAX (7)
#define DCA_ABITS_MAX (32) /* Should be 28 */
#define DCA_SUBSUBFRAMES_MAX (4)
#define DCA_SUBFRAMES_MAX (16)
#define DCA_BLOCKS_MAX (16)
#define DCA_LFE_MAX (3)
#define DCA_XLL_FBANDS_MAX (4)
#define DCA_XLL_SEGMENTS_MAX (16)
#define DCA_XLL_CHSETS_MAX (16)
#define DCA_XLL_CHANNELS_MAX (16)
#define DCA_XLL_AORDER_MAX (15)
/* Arbitrary limit; not sure what the maximum really is, but much larger. */
#define DCA_XLL_DMIX_NCOEFFS_MAX (18)
#define DCA_MAX_FRAME_SIZE 16384
#define DCA_MAX_EXSS_HEADER_SIZE 4096
#define DCA_BUFFER_PADDING_SIZE 1024
enum DCAExtensionMask {
DCA_EXT_CORE = 0x001, ///< core in core substream
DCA_EXT_XXCH = 0x002, ///< XXCh channels extension in core substream
DCA_EXT_X96 = 0x004, ///< 96/24 extension in core substream
DCA_EXT_XCH = 0x008, ///< XCh channel extension in core substream
DCA_EXT_EXSS_CORE = 0x010, ///< core in ExSS (extension substream)
DCA_EXT_EXSS_XBR = 0x020, ///< extended bitrate extension in ExSS
DCA_EXT_EXSS_XXCH = 0x040, ///< XXCh channels extension in ExSS
DCA_EXT_EXSS_X96 = 0x080, ///< 96/24 extension in ExSS
DCA_EXT_EXSS_LBR = 0x100, ///< low bitrate component in ExSS
DCA_EXT_EXSS_XLL = 0x200, ///< lossless extension in ExSS
};
typedef struct XllChSetSubHeader {
int channels; ///< number of channels in channel set, at most 16
int residual_encode; ///< residual channel encoding
int bit_resolution; ///< input sample bit-width
int bit_width; ///< original input sample bit-width
int sampling_frequency; ///< sampling frequency
int samp_freq_interp; ///< sampling frequency interpolation multiplier
int replacement_set; ///< replacement channel set group
int active_replace_set; ///< current channel set is active channel set
int primary_ch_set;
int downmix_coeff_code_embedded;
int downmix_embedded;
int downmix_type;
int hier_chset; ///< hierarchical channel set
int downmix_ncoeffs;
int downmix_coeffs[DCA_XLL_DMIX_NCOEFFS_MAX];
int ch_mask_enabled;
int ch_mask;
int mapping_coeffs_present;
int num_freq_bands;
/* m_nOrigChanOrder */
uint8_t orig_chan_order[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
uint8_t orig_chan_order_inv[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
/* Coefficients for channel pairs (at most 8), m_anPWChPairsCoeffs */
int8_t pw_ch_pairs_coeffs[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX/2];
/* m_nCurrHighestLPCOrder */
uint8_t adapt_order_max[DCA_XLL_FBANDS_MAX];
/* m_pnAdaptPredOrder */
uint8_t adapt_order[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
/* m_pnFixedPredOrder */
uint8_t fixed_order[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
/* m_pnLPCReflCoeffsQInd, unsigned version */
uint8_t lpc_refl_coeffs_q_ind[DCA_XLL_FBANDS_MAX]
[DCA_XLL_CHANNELS_MAX][DCA_XLL_AORDER_MAX];
int lsb_fsize[DCA_XLL_FBANDS_MAX];
int8_t scalable_lsbs[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
int8_t bit_width_adj_per_ch[DCA_XLL_FBANDS_MAX][DCA_XLL_CHANNELS_MAX];
} XllChSetSubHeader;
typedef struct XllNavi {
GetBitContext gb; // Context for parsing the data segments
unsigned band_size[DCA_XLL_FBANDS_MAX];
unsigned segment_size[DCA_XLL_FBANDS_MAX][DCA_XLL_SEGMENTS_MAX];
unsigned chset_size[DCA_XLL_FBANDS_MAX][DCA_XLL_SEGMENTS_MAX][DCA_XLL_CHSETS_MAX];
} XllNavi;
typedef struct QMF64_table {
float dct4_coeff[32][32];
float dct2_coeff[32][32];
float rcos[32];
float rsin[32];
} QMF64_table;
/* Primary audio coding header */
typedef struct DCAAudioHeader {
int subband_activity[DCA_PRIM_CHANNELS_MAX]; ///< subband activity count
int vq_start_subband[DCA_PRIM_CHANNELS_MAX]; ///< high frequency vq start subband
int joint_intensity[DCA_PRIM_CHANNELS_MAX]; ///< joint intensity coding index
int transient_huffman[DCA_PRIM_CHANNELS_MAX]; ///< transient mode code book
int scalefactor_huffman[DCA_PRIM_CHANNELS_MAX]; ///< scale factor code book
int bitalloc_huffman[DCA_PRIM_CHANNELS_MAX]; ///< bit allocation quantizer select
int quant_index_huffman[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; ///< quantization index codebook select
float scalefactor_adj[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; ///< scale factor adjustment
int subframes; ///< number of subframes
int total_channels; ///< number of channels including extensions
int prim_channels; ///< number of primary audio channels
} DCAAudioHeader;
typedef struct DCAChan {
DECLARE_ALIGNED(32, float, subband_samples)[DCA_BLOCKS_MAX][DCA_SUBBANDS][8];
/* Subband samples history (for ADPCM) */
DECLARE_ALIGNED(16, float, subband_samples_hist)[DCA_SUBBANDS][4];
int hist_index;
/* Half size is sufficient for core decoding, but for 96 kHz data
* we need QMF with 64 subbands and 1024 samples. */
DECLARE_ALIGNED(32, float, subband_fir_hist)[1024];
DECLARE_ALIGNED(32, float, subband_fir_noidea)[64];
/* Primary audio coding side information */
int prediction_mode[DCA_SUBBANDS]; ///< prediction mode (ADPCM used or not)
int prediction_vq[DCA_SUBBANDS]; ///< prediction VQ coefs
int bitalloc[DCA_SUBBANDS]; ///< bit allocation index
int transition_mode[DCA_SUBBANDS]; ///< transition mode (transients)
int32_t scale_factor[DCA_SUBBANDS][2];///< scale factors (2 if transient)
int joint_huff; ///< joint subband scale factors codebook
int joint_scale_factor[DCA_SUBBANDS]; ///< joint subband scale factors
int32_t high_freq_vq[DCA_SUBBANDS]; ///< VQ encoded high frequency subbands
} DCAChan;
typedef struct DCAContext {
AVClass *class; ///< class for AVOptions
AVCodecContext *avctx;
/* Frame header */
int frame_type; ///< type of the current frame
int samples_deficit; ///< deficit sample count
int crc_present; ///< crc is present in the bitstream
int sample_blocks; ///< number of PCM sample blocks
int frame_size; ///< primary frame byte size
int amode; ///< audio channels arrangement
int sample_rate; ///< audio sampling rate
int bit_rate; ///< transmission bit rate
int bit_rate_index; ///< transmission bit rate index
int dynrange; ///< embedded dynamic range flag
int timestamp; ///< embedded time stamp flag
int aux_data; ///< auxiliary data flag
int hdcd; ///< source material is mastered in HDCD
int ext_descr; ///< extension audio descriptor flag
int ext_coding; ///< extended coding flag
int aspf; ///< audio sync word insertion flag
int lfe; ///< low frequency effects flag
int predictor_history; ///< predictor history flag
int header_crc; ///< header crc check bytes
int multirate_inter; ///< multirate interpolator switch
int version; ///< encoder software revision
int copy_history; ///< copy history
int source_pcm_res; ///< source pcm resolution
int front_sum; ///< front sum/difference flag
int surround_sum; ///< surround sum/difference flag
int dialog_norm; ///< dialog normalisation parameter
/* Primary audio coding header */
DCAAudioHeader audio_header;
/* Primary audio coding side information */
int subsubframes[DCA_SUBFRAMES_MAX]; ///< number of subsubframes
int partial_samples[DCA_SUBFRAMES_MAX]; ///< partial subsubframe samples count
float downmix_coef[DCA_PRIM_CHANNELS_MAX + 1][2]; ///< stereo downmix coefficients
int dynrange_coef; ///< dynamic range coefficient
/* Core substream's embedded downmix coefficients (cf. ETSI TS 102 114 V1.4.1)
* Input: primary audio channels (incl. LFE if present)
* Output: downmix audio channels (up to 4, no LFE) */
uint8_t core_downmix; ///< embedded downmix coefficients available
uint8_t core_downmix_amode; ///< audio channel arrangement of embedded downmix
uint16_t core_downmix_codes[DCA_PRIM_CHANNELS_MAX + 1][4]; ///< embedded downmix coefficients (9-bit codes)
float lfe_data[2 * DCA_LFE_MAX * (DCA_BLOCKS_MAX + 4)]; ///< Low frequency effect data
int lfe_scale_factor;
/* Subband samples history (for ADPCM) */
DECLARE_ALIGNED(32, float, raXin)[32];
DCAChan dca_chan[DCA_PRIM_CHANNELS_MAX];
int output; ///< type of output
float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1];
float *extra_channels[DCA_PRIM_CHANNELS_MAX + 1];
uint8_t *extra_channels_buffer;
unsigned int extra_channels_buffer_size;
uint8_t dca_buffer[DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE + DCA_BUFFER_PADDING_SIZE];
int dca_buffer_size; ///< how much data is in the dca_buffer
const int8_t *channel_order_tab; ///< channel reordering table, lfe and non lfe
GetBitContext gb;
/* Current position in DCA frame */
int current_subframe;
int current_subsubframe;
int core_ext_mask; ///< present extensions in the core substream
int exss_ext_mask; ///< Non-core extensions
/* XCh extension information */
int xch_present; ///< XCh extension present and valid
int xch_base_channel; ///< index of first (only) channel containing XCH data
int xch_disable; ///< whether the XCh extension should be decoded or not
/* XLL extension information */
int xll_disable;
int xll_nch_sets; ///< number of channel sets per frame
int xll_channels; ///< total number of channels (in all channel sets)
int xll_residual_channels; ///< number of residual channels
int xll_segments; ///< number of segments per frame
int xll_log_smpl_in_seg; ///< supposedly this is "nBits4SamplLoci"
int xll_smpl_in_seg; ///< samples in segment per one frequency band for the first channel set
int xll_bits4seg_size; ///< number of bits used to read segment size
int xll_banddata_crc; ///< presence of CRC16 within each frequency band
int xll_scalable_lsb;
int xll_bits4ch_mask; ///< channel position mask
int xll_fixed_lsb_width;
XllChSetSubHeader xll_chsets[DCA_XLL_CHSETS_MAX];
XllNavi xll_navi;
int *xll_sample_buf;
unsigned int xll_sample_buf_size;
/* ExSS header parser */
int static_fields; ///< static fields present
int mix_metadata; ///< mixing metadata present
int num_mix_configs; ///< number of mix out configurations
int mix_config_num_ch[4]; ///< number of channels in each mix out configuration
int profile;
int one2one_map_chtospkr;
int debug_flag; ///< used for suppressing repeated error messages output
AVFloatDSPContext fdsp;
FFTContext imdct;
SynthFilterContext synth;
DCADSPContext dcadsp;
QMF64_table *qmf64_table;
FmtConvertContext fmt_conv;
} DCAContext;
extern av_export const uint32_t avpriv_dca_sample_rates[16];
/**
* Convert bitstream to one representation based on sync marker
*/
int ff_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
int max_size);
void ff_dca_exss_parse_header(DCAContext *s);
int ff_dca_xll_decode_header(DCAContext *s);
int ff_dca_xll_decode_navi(DCAContext *s, int asset_end);
int ff_dca_xll_decode_audio(DCAContext *s, AVFrame *frame);
#endif /* AVCODEC_DCA_H */
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