7ba6ef42de
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20898 a1c6a512-1295-4272-9138-f99709370657
122 lines
4.2 KiB
C
122 lines
4.2 KiB
C
/*
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* COOK compatible decoder
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* Copyright (c) 2003 Sascha Sommer
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* Copyright (c) 2005 Benjamin Larsson
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*
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* This file is taken from 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 _COOK_H
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#define _COOK_H
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#include <stdint.h>
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#include "libavutil/lfg.h"
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#include "bitstream.h"
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#include "dsputil.h"
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#include "bytestream.h"
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#include "rm2wav.h"
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typedef struct {
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int *now;
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int *previous;
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} cook_gains;
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typedef struct cook {
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/*
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* The following 5 functions provide the lowlevel arithmetic on
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* the internal audio buffers.
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*/
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void (* scalar_dequant)(struct cook *q, int index, int quant_index,
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int* subband_coef_index, int* subband_coef_sign,
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float* mlt_p);
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void (* decouple) (struct cook *q,
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int subband,
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float f1, float f2,
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float *decode_buffer,
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float *mlt_buffer1, float *mlt_buffer2);
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void (* imlt_window) (struct cook *q, float *buffer1,
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cook_gains *gains_ptr, float *previous_buffer);
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void (* interpolate) (struct cook *q, float* buffer,
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int gain_index, int gain_index_next);
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void (* saturate_output) (struct cook *q, int chan, int16_t *out);
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GetBitContext gb;
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int frame_number;
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int block_align;
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int extradata_size;
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/* stream data */
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int nb_channels;
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int joint_stereo;
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int bit_rate;
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int sample_rate;
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int samples_per_channel;
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int samples_per_frame;
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int subbands;
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int log2_numvector_size;
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int numvector_size; //1 << log2_numvector_size;
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int js_subband_start;
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int total_subbands;
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int num_vectors;
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int bits_per_subpacket;
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int cookversion;
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/* states */
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AVLFG random_state;
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/* transform data */
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MDCTContext mdct_ctx;
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float* mlt_window;
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/* gain buffers */
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cook_gains gains1;
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cook_gains gains2;
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int gain_1[9];
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int gain_2[9];
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int gain_3[9];
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int gain_4[9];
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/* VLC data */
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int js_vlc_bits;
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VLC envelope_quant_index[13];
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VLC sqvh[7]; //scalar quantization
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VLC ccpl; //channel coupling
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/* generatable tables and related variables */
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int gain_size_factor;
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float gain_table[23];
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/* data buffers */
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uint8_t* decoded_bytes_buffer;
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float mono_mdct_output[2048] __attribute__ ((aligned(16))); //DECLARE_ALIGNED_16(float,mono_mdct_output[2048]);
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float mono_previous_buffer1[1024];
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float mono_previous_buffer2[1024];
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float decode_buffer_1[1024];
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float decode_buffer_2[1024];
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float decode_buffer_0[1060]; /* static allocation for joint decode */
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const float *cplscales[5];
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} COOKContext;
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av_cold int cook_decode_init(RMContext *rmctx, COOKContext *q);
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int cook_decode_frame(RMContext *rmctx,COOKContext *q,
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int16_t *outbuffer, int *data_size,
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const uint8_t *inbuffer, int buf_size);
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av_cold int cook_decode_close(COOKContext *q);
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#endif
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