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