mirror of
https://github.com/FFmpeg/FFmpeg.git
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204 lines
6.5 KiB
C
204 lines
6.5 KiB
C
/*
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* TwinVQ decoder
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* Copyright (c) 2009 Vitor Sessak
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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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#ifndef AVCODEC_TWINVQ_H
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#define AVCODEC_TWINVQ_H
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#include <math.h>
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#include <stdint.h>
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#include "libavutil/common.h"
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#include "libavutil/float_dsp.h"
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#include "avcodec.h"
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#include "fft.h"
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#include "internal.h"
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enum TwinVQCodec {
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TWINVQ_CODEC_VQF,
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TWINVQ_CODEC_METASOUND,
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};
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enum TwinVQFrameType {
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TWINVQ_FT_SHORT = 0, ///< Short frame (divided in n sub-blocks)
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TWINVQ_FT_MEDIUM, ///< Medium frame (divided in m<n sub-blocks)
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TWINVQ_FT_LONG, ///< Long frame (single sub-block + PPC)
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TWINVQ_FT_PPC, ///< Periodic Peak Component (part of the long frame)
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};
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#define TWINVQ_PPC_SHAPE_CB_SIZE 64
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#define TWINVQ_PPC_SHAPE_LEN_MAX 60
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#define TWINVQ_SUB_AMP_MAX 4500.0
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#define TWINVQ_MULAW_MU 100.0
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#define TWINVQ_GAIN_BITS 8
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#define TWINVQ_AMP_MAX 13000.0
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#define TWINVQ_SUB_GAIN_BITS 5
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#define TWINVQ_WINDOW_TYPE_BITS 4
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#define TWINVQ_PGAIN_MU 200
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#define TWINVQ_LSP_COEFS_MAX 20
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#define TWINVQ_LSP_SPLIT_MAX 4
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#define TWINVQ_CHANNELS_MAX 2
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#define TWINVQ_SUBBLOCKS_MAX 16
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#define TWINVQ_BARK_N_COEF_MAX 4
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#define TWINVQ_MAX_FRAMES_PER_PACKET 2
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/**
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* Parameters and tables that are different for each frame type
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*/
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struct TwinVQFrameMode {
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uint8_t sub; ///< Number subblocks in each frame
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const uint16_t *bark_tab;
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/** number of distinct bark scale envelope values */
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uint8_t bark_env_size;
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const int16_t *bark_cb; ///< codebook for the bark scale envelope (BSE)
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uint8_t bark_n_coef;///< number of BSE CB coefficients to read
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uint8_t bark_n_bit; ///< number of bits of the BSE coefs
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//@{
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/** main codebooks for spectrum data */
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const int16_t *cb0;
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const int16_t *cb1;
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//@}
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uint8_t cb_len_read; ///< number of spectrum coefficients to read
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};
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typedef struct TwinVQFrameData {
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int window_type;
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enum TwinVQFrameType ftype;
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uint8_t main_coeffs[1024];
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uint8_t ppc_coeffs[TWINVQ_PPC_SHAPE_LEN_MAX];
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uint8_t gain_bits[TWINVQ_CHANNELS_MAX];
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uint8_t sub_gain_bits[TWINVQ_CHANNELS_MAX * TWINVQ_SUBBLOCKS_MAX];
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uint8_t bark1[TWINVQ_CHANNELS_MAX][TWINVQ_SUBBLOCKS_MAX][TWINVQ_BARK_N_COEF_MAX];
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uint8_t bark_use_hist[TWINVQ_CHANNELS_MAX][TWINVQ_SUBBLOCKS_MAX];
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uint8_t lpc_idx1[TWINVQ_CHANNELS_MAX];
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uint8_t lpc_idx2[TWINVQ_CHANNELS_MAX][TWINVQ_LSP_SPLIT_MAX];
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uint8_t lpc_hist_idx[TWINVQ_CHANNELS_MAX];
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int p_coef[TWINVQ_CHANNELS_MAX];
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int g_coef[TWINVQ_CHANNELS_MAX];
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} TwinVQFrameData;
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/**
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* Parameters and tables that are different for every combination of
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* bitrate/sample rate
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*/
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typedef struct TwinVQModeTab {
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struct TwinVQFrameMode fmode[3]; ///< frame type-dependant parameters
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uint16_t size; ///< frame size in samples
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uint8_t n_lsp; ///< number of lsp coefficients
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const float *lspcodebook;
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/* number of bits of the different LSP CB coefficients */
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uint8_t lsp_bit0;
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uint8_t lsp_bit1;
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uint8_t lsp_bit2;
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uint8_t lsp_split; ///< number of CB entries for the LSP decoding
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const int16_t *ppc_shape_cb; ///< PPC shape CB
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/** number of the bits for the PPC period value */
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uint8_t ppc_period_bit;
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uint8_t ppc_shape_bit; ///< number of bits of the PPC shape CB coeffs
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uint8_t ppc_shape_len; ///< size of PPC shape CB
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uint8_t pgain_bit; ///< bits for PPC gain
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/** constant for peak period to peak width conversion */
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uint16_t peak_per2wid;
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} TwinVQModeTab;
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typedef struct TwinVQContext {
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AVCodecContext *avctx;
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AVFloatDSPContext *fdsp;
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FFTContext mdct_ctx[3];
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const TwinVQModeTab *mtab;
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int is_6kbps;
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// history
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float lsp_hist[2][20]; ///< LSP coefficients of the last frame
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float bark_hist[3][2][40]; ///< BSE coefficients of last frame
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// bitstream parameters
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int16_t permut[4][4096];
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uint8_t length[4][2]; ///< main codebook stride
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uint8_t length_change[4];
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uint8_t bits_main_spec[2][4][2]; ///< bits for the main codebook
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int bits_main_spec_change[4];
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int n_div[4];
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float *spectrum;
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float *curr_frame; ///< non-interleaved output
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float *prev_frame; ///< non-interleaved previous frame
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int last_block_pos[2];
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int discarded_packets;
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float *cos_tabs[3];
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// scratch buffers
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float *tmp_buf;
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int frame_size, frames_per_packet, cur_frame;
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TwinVQFrameData bits[TWINVQ_MAX_FRAMES_PER_PACKET];
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enum TwinVQCodec codec;
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int (*read_bitstream)(AVCodecContext *avctx, struct TwinVQContext *tctx,
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const uint8_t *buf, int buf_size);
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void (*dec_bark_env)(struct TwinVQContext *tctx, const uint8_t *in,
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int use_hist, int ch, float *out, float gain,
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enum TwinVQFrameType ftype);
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void (*decode_ppc)(struct TwinVQContext *tctx, int period_coef, int g_coef,
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const float *shape, float *speech);
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} TwinVQContext;
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extern const enum TwinVQFrameType ff_twinvq_wtype_to_ftype_table[];
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/** @note not speed critical, hence not optimized */
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static inline void twinvq_memset_float(float *buf, float val, int size)
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{
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while (size--)
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*buf++ = val;
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}
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static inline float twinvq_mulawinv(float y, float clip, float mu)
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{
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y = av_clipf(y / clip, -1, 1);
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return clip * FFSIGN(y) * (exp(log(1 + mu) * fabs(y)) - 1) / mu;
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}
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int ff_twinvq_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame_ptr, AVPacket *avpkt);
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av_cold int ff_twinvq_decode_close(AVCodecContext *avctx);
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av_cold int ff_twinvq_decode_init(AVCodecContext *avctx);
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#endif /* AVCODEC_TWINVQ_DATA_H */
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