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