/* * ATRAC3+ compatible decoder * * Copyright (c) 2010-2013 Maxim Poliakovski * * 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 */ /** * @file * Global structures, constants and data for ATRAC3+ decoder. */ #ifndef AVCODEC_ATRAC3PLUS_H #define AVCODEC_ATRAC3PLUS_H #include #include "libavutil/float_dsp.h" #include "atrac.h" #include "avcodec.h" #include "fft.h" #include "get_bits.h" /** Global unit sizes */ #define ATRAC3P_SUBBANDS 16 ///< number of PQF subbands #define ATRAC3P_SUBBAND_SAMPLES 128 ///< number of samples per subband #define ATRAC3P_FRAME_SAMPLES (ATRAC3P_SUBBAND_SAMPLES * ATRAC3P_SUBBANDS) #define ATRAC3P_PQF_FIR_LEN 12 ///< length of the prototype FIR of the PQF /** Global constants */ #define ATRAC3P_POWER_COMP_OFF 15 ///< disable power compensation /** ATRAC3+ channel unit types */ enum Atrac3pChannelUnitTypes { CH_UNIT_MONO = 0, ///< unit containing one coded channel CH_UNIT_STEREO = 1, ///< unit containing two jointly-coded channels CH_UNIT_EXTENSION = 2, ///< unit containing extension information CH_UNIT_TERMINATOR = 3 ///< unit sequence terminator }; /** Per-channel IPQF history */ typedef struct Atrac3pIPQFChannelCtx { DECLARE_ALIGNED(32, float, buf1)[ATRAC3P_PQF_FIR_LEN * 2][8]; DECLARE_ALIGNED(32, float, buf2)[ATRAC3P_PQF_FIR_LEN * 2][8]; int pos; } Atrac3pIPQFChannelCtx; /** Amplitude envelope of a group of sine waves */ typedef struct Atrac3pWaveEnvelope { int has_start_point; ///< indicates start point within the GHA window int has_stop_point; ///< indicates stop point within the GHA window int start_pos; ///< start position expressed in n*4 samples int stop_pos; ///< stop position expressed in n*4 samples } Atrac3pWaveEnvelope; /** Parameters of a group of sine waves */ typedef struct Atrac3pWavesData { Atrac3pWaveEnvelope pend_env; ///< pending envelope from the previous frame Atrac3pWaveEnvelope curr_env; ///< group envelope from the current frame int num_wavs; ///< number of sine waves in the group int start_index; ///< start index into global tones table for that subband } Atrac3pWavesData; /** Parameters of a single sine wave */ typedef struct Atrac3pWaveParam { int freq_index; ///< wave frequency index int amp_sf; ///< quantized amplitude scale factor int amp_index; ///< quantized amplitude index int phase_index; ///< quantized phase index } Atrac3pWaveParam; /** Sound channel parameters */ typedef struct Atrac3pChanParams { int ch_num; int num_coded_vals; ///< number of transmitted quant unit values int fill_mode; int split_point; int table_type; ///< table type: 0 - tone?, 1- noise? int qu_wordlen[32]; ///< array of word lengths for each quant unit int qu_sf_idx[32]; ///< array of scale factor indexes for each quant unit int qu_tab_idx[32]; ///< array of code table indexes for each quant unit int16_t spectrum[2048]; ///< decoded IMDCT spectrum uint8_t power_levs[5]; ///< power compensation levels /* imdct window shape history (2 frames) for overlapping. */ uint8_t wnd_shape_hist[2][ATRAC3P_SUBBANDS]; ///< IMDCT window shape, 0=sine/1=steep uint8_t *wnd_shape; ///< IMDCT window shape for current frame uint8_t *wnd_shape_prev; ///< IMDCT window shape for previous frame /* gain control data history (2 frames) for overlapping. */ AtracGainInfo gain_data_hist[2][ATRAC3P_SUBBANDS]; ///< gain control data for all subbands AtracGainInfo *gain_data; ///< gain control data for next frame AtracGainInfo *gain_data_prev; ///< gain control data for previous frame int num_gain_subbands; ///< number of subbands with gain control data /* tones data history (2 frames) for overlapping. */ Atrac3pWavesData tones_info_hist[2][ATRAC3P_SUBBANDS]; Atrac3pWavesData *tones_info; Atrac3pWavesData *tones_info_prev; } Atrac3pChanParams; /* Per-unit sine wave parameters */ typedef struct Atrac3pWaveSynthParams { int tones_present; ///< 1 - tones info present int amplitude_mode; ///< 1 - low range, 0 - high range int num_tone_bands; ///< number of PQF bands with tones uint8_t tone_sharing[ATRAC3P_SUBBANDS]; ///< 1 - subband-wise tone sharing flags uint8_t tone_master[ATRAC3P_SUBBANDS]; ///< 1 - subband-wise tone channel swapping uint8_t phase_shift[ATRAC3P_SUBBANDS]; ///< 1 - subband-wise 180° phase shifting int tones_index; ///< total sum of tones in this unit Atrac3pWaveParam waves[48]; } Atrac3pWaveSynthParams; /** Channel unit parameters */ typedef struct Atrac3pChanUnitCtx { /* channel unit variables */ int unit_type; ///< unit type (mono/stereo) int num_quant_units; int num_subbands; int used_quant_units; ///< number of quant units with coded spectrum int num_coded_subbands; ///< number of subbands with coded spectrum int mute_flag; ///< mute flag int use_full_table; ///< 1 - full table list, 0 - restricted one int noise_present; ///< 1 - global noise info present int noise_level_index; ///< global noise level index int noise_table_index; ///< global noise RNG table index uint8_t swap_channels[ATRAC3P_SUBBANDS]; ///< 1 - perform subband-wise channel swapping uint8_t negate_coeffs[ATRAC3P_SUBBANDS]; ///< 1 - subband-wise IMDCT coefficients negation Atrac3pChanParams channels[2]; /* Variables related to GHA tones */ Atrac3pWaveSynthParams wave_synth_hist[2]; ///< waves synth history for two frames Atrac3pWaveSynthParams *waves_info; Atrac3pWaveSynthParams *waves_info_prev; Atrac3pIPQFChannelCtx ipqf_ctx[2]; DECLARE_ALIGNED(32, float, prev_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< overlapping buffer } Atrac3pChanUnitCtx; /** * Initialize VLC tables for bitstream parsing. * * @param[in] codec ptr to the AVCodec */ void ff_atrac3p_init_vlcs(AVCodec *codec); /** * Decode bitstream data of a channel unit. * * @param[in] gb the GetBit context * @param[in,out] ctx ptr to the channel unit context * @param[in] num_channels number of channels to process * @param[in] avctx ptr to the AVCodecContext * @return result code: 0 = OK, otherwise - error code */ int ff_atrac3p_decode_channel_unit(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, int num_channels, AVCodecContext *avctx); /** * Initialize IMDCT transform. * * @param[in] avctx ptr to the AVCodecContext * @param[in] mdct_ctx pointer to MDCT transform context */ void ff_atrac3p_init_imdct(AVCodecContext *avctx, FFTContext *mdct_ctx); /** * Initialize sine waves synthesizer. */ void ff_atrac3p_init_wave_synth(void); /** * Synthesize sine waves for a particular subband. * * @param[in] ch_unit pointer to the channel unit context * @param[in] fdsp pointer to float DSP context * @param[in] ch_num which channel to process * @param[in] sb which subband to process * @param[out] out receives processed data */ void ff_atrac3p_generate_tones(Atrac3pChanUnitCtx *ch_unit, AVFloatDSPContext *fdsp, int ch_num, int sb, float *out); /** * Perform power compensation aka noise dithering. * * @param[in] ctx ptr to the channel context * @param[in] ch_index which channel to process * @param[in,out] sp ptr to channel spectrum to process * @param[in] rng_index indicates which RNG table to use * @param[in] sb_num which subband to process */ void ff_atrac3p_power_compensation(Atrac3pChanUnitCtx *ctx, int ch_index, float *sp, int rng_index, int sb_num); /** * Regular IMDCT and windowing without overlapping, * with spectrum reversal in the odd subbands. * * @param[in] fdsp pointer to float DSP context * @param[in] mdct_ctx pointer to MDCT transform context * @param[in] pIn float input * @param[out] pOut float output * @param[in] wind_id which MDCT window to apply * @param[in] sb subband number */ void ff_atrac3p_imdct(AVFloatDSPContext *fdsp, FFTContext *mdct_ctx, float *pIn, float *pOut, int wind_id, int sb); /** * Subband synthesis filter based on the polyphase quadrature (pseudo-QMF) * filter bank. * * @param[in] dct_ctx ptr to the pre-initialized IDCT context * @param[in,out] hist ptr to the filter history * @param[in] in input data to process * @param[out] out receives processed data */ void ff_atrac3p_ipqf(FFTContext *dct_ctx, Atrac3pIPQFChannelCtx *hist, const float *in, float *out); extern const uint16_t ff_atrac3p_qu_to_spec_pos[33]; extern const float ff_atrac3p_sf_tab[64]; extern const float ff_atrac3p_mant_tab[8]; #endif /* AVCODEC_ATRAC3PLUS_H */