mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Diego Biurrun <diego@biurrun.de>pull/37/head
Kostya Shishkov
12 years ago
committed by
Diego Biurrun
parent
4d8d16b596
commit
86f4c59bd6
4 changed files with 646 additions and 547 deletions
@ -0,0 +1,198 @@ |
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/*
|
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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 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_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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/**
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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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// 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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TwinVQFrameData bits; |
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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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@ -0,0 +1,421 @@ |
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/*
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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 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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#include <math.h> |
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#include <stdint.h> |
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#include "libavutil/channel_layout.h" |
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#include "avcodec.h" |
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#include "get_bits.h" |
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#include "internal.h" |
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#include "twinvq.h" |
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#include "twinvq_data.h" |
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static const TwinVQModeTab mode_08_08 = { |
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{ |
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{ 8, bark_tab_s08_64, 10, tab.fcb08s, 1, 5, tab.cb0808s0, tab.cb0808s1, 18 }, |
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{ 2, bark_tab_m08_256, 20, tab.fcb08m, 2, 5, tab.cb0808m0, tab.cb0808m1, 16 }, |
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{ 1, bark_tab_l08_512, 30, tab.fcb08l, 3, 6, tab.cb0808l0, tab.cb0808l1, 17 } |
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}, |
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512, 12, tab.lsp08, 1, 5, 3, 3, tab.shape08, 8, 28, 20, 6, 40 |
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}; |
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static const TwinVQModeTab mode_11_08 = { |
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{ |
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{ 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1108s0, tab.cb1108s1, 29 }, |
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{ 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1108m0, tab.cb1108m1, 24 }, |
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{ 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1108l0, tab.cb1108l1, 27 } |
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}, |
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512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90 |
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}; |
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static const TwinVQModeTab mode_11_10 = { |
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{ |
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{ 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1110s0, tab.cb1110s1, 21 }, |
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{ 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1110m0, tab.cb1110m1, 18 }, |
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{ 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1110l0, tab.cb1110l1, 20 } |
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}, |
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512, 16, tab.lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90 |
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}; |
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static const TwinVQModeTab mode_16_16 = { |
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{ |
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{ 8, bark_tab_s16_128, 10, tab.fcb16s, 1, 5, tab.cb1616s0, tab.cb1616s1, 16 }, |
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{ 2, bark_tab_m16_512, 20, tab.fcb16m, 2, 5, tab.cb1616m0, tab.cb1616m1, 15 }, |
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{ 1, bark_tab_l16_1024, 30, tab.fcb16l, 3, 6, tab.cb1616l0, tab.cb1616l1, 16 } |
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}, |
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1024, 16, tab.lsp16, 1, 6, 4, 3, tab.shape16, 9, 56, 60, 7, 180 |
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}; |
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static const TwinVQModeTab mode_22_20 = { |
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{ |
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{ 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18 }, |
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{ 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17 }, |
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{ 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18 } |
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}, |
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1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144 |
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}; |
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static const TwinVQModeTab mode_22_24 = { |
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{ |
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{ 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15 }, |
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{ 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14 }, |
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{ 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15 } |
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}, |
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1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144 |
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}; |
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static const TwinVQModeTab mode_22_32 = { |
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{ |
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{ 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11 }, |
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{ 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11 }, |
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{ 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12 } |
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}, |
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512, 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72 |
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}; |
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static const TwinVQModeTab mode_44_40 = { |
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{ |
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{ 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4440s0, tab.cb4440s1, 18 }, |
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{ 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4440m0, tab.cb4440m1, 17 }, |
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{ 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4440l0, tab.cb4440l1, 17 } |
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}, |
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2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432 |
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}; |
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static const TwinVQModeTab mode_44_48 = { |
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{ |
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{ 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4448s0, tab.cb4448s1, 15 }, |
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{ 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4448m0, tab.cb4448m1, 14 }, |
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{ 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4448l0, tab.cb4448l1, 14 } |
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}, |
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2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432 |
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}; |
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/**
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* Evaluate a * b / 400 rounded to the nearest integer. When, for example, |
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* a * b == 200 and the nearest integer is ill-defined, use a table to emulate |
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* the following broken float-based implementation used by the binary decoder: |
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* |
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* @code |
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* static int very_broken_op(int a, int b) |
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* { |
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* static float test; // Ugh, force gcc to do the division first...
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* |
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* test = a / 400.0; |
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* return b * test + 0.5; |
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* } |
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* @endcode |
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* |
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* @note if this function is replaced by just ROUNDED_DIV(a * b, 400.0), the |
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* stddev between the original file (before encoding with Yamaha encoder) and |
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* the decoded output increases, which leads one to believe that the encoder |
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* expects exactly this broken calculation. |
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*/ |
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static int very_broken_op(int a, int b) |
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{ |
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int x = a * b + 200; |
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int size; |
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const uint8_t *rtab; |
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if (x % 400 || b % 5) |
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return x / 400; |
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x /= 400; |
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size = tabs[b / 5].size; |
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rtab = tabs[b / 5].tab; |
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return x - rtab[size * av_log2(2 * (x - 1) / size) + (x - 1) % size]; |
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} |
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/**
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* Sum to data a periodic peak of a given period, width and shape. |
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* |
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* @param period the period of the peak divised by 400.0 |
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*/ |
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static void add_peak(int period, int width, const float *shape, |
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float ppc_gain, float *speech, int len) |
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{ |
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int i, j; |
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const float *shape_end = shape + len; |
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int center; |
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// First peak centered around zero
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for (i = 0; i < width / 2; i++) |
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speech[i] += ppc_gain * *shape++; |
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for (i = 1; i < ROUNDED_DIV(len, width); i++) { |
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center = very_broken_op(period, i); |
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for (j = -width / 2; j < (width + 1) / 2; j++) |
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speech[j + center] += ppc_gain * *shape++; |
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} |
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// For the last block, be careful not to go beyond the end of the buffer
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center = very_broken_op(period, i); |
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for (j = -width / 2; j < (width + 1) / 2 && shape < shape_end; j++) |
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speech[j + center] += ppc_gain * *shape++; |
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} |
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static void decode_ppc(TwinVQContext *tctx, int period_coef, int g_coef, |
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const float *shape, float *speech) |
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{ |
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const TwinVQModeTab *mtab = tctx->mtab; |
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int isampf = tctx->avctx->sample_rate / 1000; |
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int ibps = tctx->avctx->bit_rate / (1000 * tctx->avctx->channels); |
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int min_period = ROUNDED_DIV(40 * 2 * mtab->size, isampf); |
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int max_period = ROUNDED_DIV(40 * 2 * mtab->size * 6, isampf); |
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int period_range = max_period - min_period; |
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float pgain_step = 25000.0 / ((1 << mtab->pgain_bit) - 1); |
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float ppc_gain = 1.0 / 8192 * |
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twinvq_mulawinv(pgain_step * g_coef + |
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pgain_step / 2, |
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25000.0, TWINVQ_PGAIN_MU); |
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// This is actually the period multiplied by 400. It is just linearly coded
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// between its maximum and minimum value.
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int period = min_period + |
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ROUNDED_DIV(period_coef * period_range, |
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(1 << mtab->ppc_period_bit) - 1); |
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int width; |
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if (isampf == 22 && ibps == 32) { |
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// For some unknown reason, NTT decided to code this case differently...
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width = ROUNDED_DIV((period + 800) * mtab->peak_per2wid, |
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400 * mtab->size); |
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} else |
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width = period * mtab->peak_per2wid / (400 * mtab->size); |
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add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len); |
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} |
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static void dec_bark_env(TwinVQContext *tctx, const uint8_t *in, int use_hist, |
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int ch, float *out, float gain, |
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enum TwinVQFrameType ftype) |
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{ |
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const TwinVQModeTab *mtab = tctx->mtab; |
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int i, j; |
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float *hist = tctx->bark_hist[ftype][ch]; |
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float val = ((const float []) { 0.4, 0.35, 0.28 })[ftype]; |
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int bark_n_coef = mtab->fmode[ftype].bark_n_coef; |
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int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef; |
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int idx = 0; |
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for (i = 0; i < fw_cb_len; i++) |
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for (j = 0; j < bark_n_coef; j++, idx++) { |
||||
float tmp2 = mtab->fmode[ftype].bark_cb[fw_cb_len * in[j] + i] * |
||||
(1.0 / 4096); |
||||
float st = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0 |
||||
: tmp2 + 1.0; |
||||
|
||||
hist[idx] = tmp2; |
||||
if (st < -1.0) |
||||
st = 1.0; |
||||
|
||||
twinvq_memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]); |
||||
out += mtab->fmode[ftype].bark_tab[idx]; |
||||
} |
||||
} |
||||
|
||||
static void read_cb_data(TwinVQContext *tctx, GetBitContext *gb, |
||||
uint8_t *dst, enum TwinVQFrameType ftype) |
||||
{ |
||||
int i; |
||||
|
||||
for (i = 0; i < tctx->n_div[ftype]; i++) { |
||||
int bs_second_part = (i >= tctx->bits_main_spec_change[ftype]); |
||||
|
||||
*dst++ = get_bits(gb, tctx->bits_main_spec[0][ftype][bs_second_part]); |
||||
*dst++ = get_bits(gb, tctx->bits_main_spec[1][ftype][bs_second_part]); |
||||
} |
||||
} |
||||
|
||||
static int twinvq_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx, |
||||
const uint8_t *buf, int buf_size) |
||||
{ |
||||
TwinVQFrameData *bits = &tctx->bits; |
||||
const TwinVQModeTab *mtab = tctx->mtab; |
||||
int channels = tctx->avctx->channels; |
||||
int sub; |
||||
GetBitContext gb; |
||||
int i, j, k; |
||||
|
||||
if (buf_size * 8 < avctx->bit_rate * mtab->size / avctx->sample_rate + 8) { |
||||
av_log(avctx, AV_LOG_ERROR, |
||||
"Frame too small (%d bytes). Truncated file?\n", buf_size); |
||||
return AVERROR(EINVAL); |
||||
} |
||||
|
||||
init_get_bits(&gb, buf, buf_size * 8); |
||||
skip_bits(&gb, get_bits(&gb, 8)); |
||||
|
||||
bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS); |
||||
|
||||
if (bits->window_type > 8) { |
||||
av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n"); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
|
||||
bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits.window_type]; |
||||
|
||||
sub = mtab->fmode[bits->ftype].sub; |
||||
|
||||
read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype); |
||||
|
||||
for (i = 0; i < channels; i++) |
||||
for (j = 0; j < sub; j++) |
||||
for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++) |
||||
bits->bark1[i][j][k] = |
||||
get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit); |
||||
|
||||
for (i = 0; i < channels; i++) |
||||
for (j = 0; j < sub; j++) |
||||
bits->bark_use_hist[i][j] = get_bits1(&gb); |
||||
|
||||
if (bits->ftype == TWINVQ_FT_LONG) { |
||||
for (i = 0; i < channels; i++) |
||||
bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); |
||||
} else { |
||||
for (i = 0; i < channels; i++) { |
||||
bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); |
||||
for (j = 0; j < sub; j++) |
||||
bits->sub_gain_bits[i * sub + j] = get_bits(&gb, |
||||
TWINVQ_SUB_GAIN_BITS); |
||||
} |
||||
} |
||||
|
||||
for (i = 0; i < channels; i++) { |
||||
bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0); |
||||
bits->lpc_idx1[i] = get_bits(&gb, mtab->lsp_bit1); |
||||
|
||||
for (j = 0; j < mtab->lsp_split; j++) |
||||
bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2); |
||||
} |
||||
|
||||
if (bits->ftype == TWINVQ_FT_LONG) { |
||||
read_cb_data(tctx, &gb, bits->ppc_coeffs, 3); |
||||
for (i = 0; i < channels; i++) { |
||||
bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit); |
||||
bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit); |
||||
} |
||||
} |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static av_cold int twinvq_decode_init(AVCodecContext *avctx) |
||||
{ |
||||
int isampf, ibps; |
||||
TwinVQContext *tctx = avctx->priv_data; |
||||
|
||||
if (!avctx->extradata || avctx->extradata_size < 12) { |
||||
av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n"); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
avctx->channels = AV_RB32(avctx->extradata) + 1; |
||||
avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000; |
||||
isampf = AV_RB32(avctx->extradata + 8); |
||||
|
||||
if (isampf < 8 || isampf > 44) { |
||||
av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate\n"); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
switch (isampf) { |
||||
case 44: |
||||
avctx->sample_rate = 44100; |
||||
break; |
||||
case 22: |
||||
avctx->sample_rate = 22050; |
||||
break; |
||||
case 11: |
||||
avctx->sample_rate = 11025; |
||||
break; |
||||
default: |
||||
avctx->sample_rate = isampf * 1000; |
||||
break; |
||||
} |
||||
|
||||
if (avctx->channels <= 0 || avctx->channels > TWINVQ_CHANNELS_MAX) { |
||||
av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n", |
||||
avctx->channels); |
||||
return -1; |
||||
} |
||||
avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO |
||||
: AV_CH_LAYOUT_STEREO; |
||||
|
||||
ibps = avctx->bit_rate / (1000 * avctx->channels); |
||||
|
||||
switch ((isampf << 8) + ibps) { |
||||
case (8 << 8) + 8: |
||||
tctx->mtab = &mode_08_08; |
||||
break; |
||||
case (11 << 8) + 8: |
||||
tctx->mtab = &mode_11_08; |
||||
break; |
||||
case (11 << 8) + 10: |
||||
tctx->mtab = &mode_11_10; |
||||
break; |
||||
case (16 << 8) + 16: |
||||
tctx->mtab = &mode_16_16; |
||||
break; |
||||
case (22 << 8) + 20: |
||||
tctx->mtab = &mode_22_20; |
||||
break; |
||||
case (22 << 8) + 24: |
||||
tctx->mtab = &mode_22_24; |
||||
break; |
||||
case (22 << 8) + 32: |
||||
tctx->mtab = &mode_22_32; |
||||
break; |
||||
case (44 << 8) + 40: |
||||
tctx->mtab = &mode_44_40; |
||||
break; |
||||
case (44 << 8) + 48: |
||||
tctx->mtab = &mode_44_48; |
||||
break; |
||||
default: |
||||
av_log(avctx, AV_LOG_ERROR, |
||||
"This version does not support %d kHz - %d kbit/s/ch mode.\n", |
||||
isampf, isampf); |
||||
return -1; |
||||
} |
||||
|
||||
tctx->codec = TWINVQ_CODEC_VQF; |
||||
tctx->read_bitstream = twinvq_read_bitstream; |
||||
tctx->dec_bark_env = dec_bark_env; |
||||
tctx->decode_ppc = decode_ppc; |
||||
|
||||
return ff_twinvq_decode_init(avctx); |
||||
} |
||||
|
||||
AVCodec ff_twinvq_decoder = { |
||||
.name = "twinvq", |
||||
.type = AVMEDIA_TYPE_AUDIO, |
||||
.id = AV_CODEC_ID_TWINVQ, |
||||
.priv_data_size = sizeof(TwinVQContext), |
||||
.init = twinvq_decode_init, |
||||
.close = ff_twinvq_decode_close, |
||||
.decode = ff_twinvq_decode_frame, |
||||
.capabilities = CODEC_CAP_DR1, |
||||
.long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"), |
||||
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, |
||||
AV_SAMPLE_FMT_NONE }, |
||||
}; |
||||
Loading…
Reference in new issue