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Diffstat (limited to 'libavcodec/dca_lbr.h')
| -rw-r--r-- | libavcodec/dca_lbr.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/libavcodec/dca_lbr.h b/libavcodec/dca_lbr.h new file mode 100644 index 0000000000..e6ca8057e9 --- /dev/null +++ b/libavcodec/dca_lbr.h @@ -0,0 +1,130 @@ +/* + * 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 + */ + +#ifndef AVCODEC_DCA_LBR_H +#define AVCODEC_DCA_LBR_H + +#include "libavutil/common.h" +#include "libavutil/float_dsp.h" +#include "libavutil/mem.h" + +#include "avcodec.h" +#include "internal.h" +#include "get_bits.h" +#include "dca.h" +#include "dca_exss.h" +#include "dcadsp.h" +#include "fft.h" + +#define DCA_LBR_CHANNELS 6 +#define DCA_LBR_CHANNELS_TOTAL 32 +#define DCA_LBR_SUBBANDS 32 +#define DCA_LBR_TONES 512 + +#define DCA_LBR_TIME_SAMPLES 128 +#define DCA_LBR_TIME_HISTORY 8 + +typedef struct DCALbrTone { + uint8_t x_freq; ///< Spectral line offset + uint8_t f_delt; ///< Difference between original and center frequency + uint8_t ph_rot; ///< Phase rotation + uint8_t pad; ///< Padding field + uint8_t amp[DCA_LBR_CHANNELS]; ///< Per-channel amplitude + uint8_t phs[DCA_LBR_CHANNELS]; ///< Per-channel phase +} DCALbrTone; + +typedef struct DCALbrDecoder { + AVCodecContext *avctx; + GetBitContext gb; + + int sample_rate; ///< Sample rate of LBR audio + int ch_mask; ///< LBR speaker mask + int flags; ///< Flags for LBR decoder initialization + int bit_rate_orig; ///< Original bit rate + int bit_rate_scaled; ///< Scaled bit rate + + int nchannels; ///< Number of fullband channels to decode + int nchannels_total; ///< Total number of fullband channels + int freq_range; ///< Frequency range of LBR audio + int band_limit; ///< Band limit factor + int limited_rate; ///< Band limited sample rate + int limited_range; ///< Band limited frequency range + int res_profile; ///< Resolution profile + int nsubbands; ///< Number of encoded subbands + int g3_avg_only_start_sb; ///< Subband index where grid 3 scale factors end + int min_mono_subband; ///< Subband index where mono encoding starts + int max_mono_subband; ///< Subband index where mono encoding ends + + int framenum; ///< Lower 5 bits of current frame number + int lbr_rand; ///< Seed for subband randomization + int warned; ///< Flags for warning suppression + + uint8_t quant_levels[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Quantization levels + uint8_t sb_indices[DCA_LBR_SUBBANDS]; ///< Subband reordering indices + + uint8_t sec_ch_sbms[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Right channel inversion or mid/side decoding flags + uint8_t sec_ch_lrms[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS]; ///< Flags indicating if left/right channel are swapped + uint32_t ch_pres[DCA_LBR_CHANNELS]; ///< Subband allocation flags + + uint8_t grid_1_scf[DCA_LBR_CHANNELS][12][8]; ///< Grid 1 scale factors + uint8_t grid_2_scf[DCA_LBR_CHANNELS][3][64]; ///< Grid 2 scale factors + + int8_t grid_3_avg[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS - 4]; ///< Grid 3 average values + int8_t grid_3_scf[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS - 4][8]; ///< Grid 3 scale factors + uint32_t grid_3_pres[DCA_LBR_CHANNELS]; ///< Grid 3 scale factors presence flags + + uint8_t high_res_scf[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS][8]; ///< High-frequency resolution scale factors + + uint8_t part_stereo[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS / 4][5]; ///< Partial stereo coefficients + uint8_t part_stereo_pres; ///< Partial stereo coefficients presence flags + + float lpc_coeff[2][DCA_LBR_CHANNELS][3][2][8]; ///< Predictor coefficients + + float sb_scf[DCA_LBR_SUBBANDS]; ///< Subband randomization scale factors + + float *time_samples[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS]; ///< Time samples + + float *ts_buffer; ///< Time sample buffer base + unsigned int ts_size; ///< Time sample buffer size + + DECLARE_ALIGNED(32, float, history)[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS * 4]; ///< IMDCT history + DECLARE_ALIGNED(32, float, window)[DCA_LBR_SUBBANDS * 4]; ///< Long window for IMDCT + + DECLARE_ALIGNED(32, float, lfe_data)[64]; ///< Decimated LFE samples + DECLARE_ALIGNED(32, float, lfe_history)[5][2]; ///< LFE IIR filter history + float lfe_scale; ///< Scale factor of LFE samples before IIR filter + + uint8_t tonal_scf[6]; ///< Tonal scale factors + uint16_t tonal_bounds[5][32][2]; ///< Per-group per-subframe start/end positions of tones + DCALbrTone tones[DCA_LBR_TONES]; ///< Circular buffer of tones + int ntones; ///< Circular buffer head position + + FFTContext imdct; + AVFloatDSPContext *fdsp; + DCADSPContext *dcadsp; +} DCALbrDecoder; + +int ff_dca_lbr_parse(DCALbrDecoder *s, uint8_t *data, DCAExssAsset *asset); +int ff_dca_lbr_filter_frame(DCALbrDecoder *s, AVFrame *frame); +av_cold void ff_dca_lbr_flush(DCALbrDecoder *s); +av_cold int ff_dca_lbr_init(DCALbrDecoder *s); +av_cold void ff_dca_lbr_close(DCALbrDecoder *s); + +#endif |