[deb_ffmpeg.git] / ffmpeg / libavcodec / wma.h

/*
 * WMA compatible codec
 * Copyright (c) 2002-2007 The FFmpeg Project
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_WMA_H
#define AVCODEC_WMA_H

#include "libavutil/float_dsp.h"

#include "fft.h"
#include "fmtconvert.h"
#include "get_bits.h"
#include "put_bits.h"

/* size of blocks */
#define BLOCK_MIN_BITS 7
#define BLOCK_MAX_BITS 11
#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)

#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)

/* XXX: find exact max size */
#define HIGH_BAND_MAX_SIZE 16

#define NB_LSP_COEFS 10

/* XXX: is it a suitable value ? */
#define MAX_CODED_SUPERFRAME_SIZE 16384

#define MAX_CHANNELS 2

#define NOISE_TAB_SIZE 8192

#define LSP_POW_BITS 7

// FIXME should be in wmadec
#define VLCBITS 9
#define VLCMAX ((22 + VLCBITS - 1) / VLCBITS)

typedef float WMACoef;          ///< type for decoded coefficients, int16_t would be enough for wma 1/2

typedef struct CoefVLCTable {
    int n;                      ///< total number of codes
    int max_level;
    const uint32_t *huffcodes;  ///< VLC bit values
    const uint8_t *huffbits;    ///< VLC bit size
    const uint16_t *levels;     ///< table to build run/level tables
} CoefVLCTable;

typedef struct WMACodecContext {
    AVCodecContext *avctx;
    GetBitContext gb;
    PutBitContext pb;
    int version;                            ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
    int use_bit_reservoir;
    int use_variable_block_len;
    int use_exp_vlc;                        ///< exponent coding: 0 = lsp, 1 = vlc + delta
    int use_noise_coding;                   ///< true if perceptual noise is added
    int byte_offset_bits;
    VLC exp_vlc;
    int exponent_sizes[BLOCK_NB_SIZES];
    uint16_t exponent_bands[BLOCK_NB_SIZES][25];
    int high_band_start[BLOCK_NB_SIZES];    ///< index of first coef in high band
    int coefs_start;                        ///< first coded coef
    int coefs_end[BLOCK_NB_SIZES];          ///< max number of coded coefficients
    int exponent_high_sizes[BLOCK_NB_SIZES];
    int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
    VLC hgain_vlc;

    /* coded values in high bands */
    int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
    int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];

    /* there are two possible tables for spectral coefficients */
// FIXME the following 3 tables should be shared between decoders
    VLC coef_vlc[2];
    uint16_t *run_table[2];
    float *level_table[2];
    uint16_t *int_table[2];
    const CoefVLCTable *coef_vlcs[2];
    /* frame info */
    int frame_len;                          ///< frame length in samples
    int frame_len_bits;                     ///< frame_len = 1 << frame_len_bits
    int nb_block_sizes;                     ///< number of block sizes
    /* block info */
    int reset_block_lengths;
    int block_len_bits;                     ///< log2 of current block length
    int next_block_len_bits;                ///< log2 of next block length
    int prev_block_len_bits;                ///< log2 of prev block length
    int block_len;                          ///< block length in samples
    int block_num;                          ///< block number in current frame
    int block_pos;                          ///< current position in frame
    uint8_t ms_stereo;                      ///< true if mid/side stereo mode
    uint8_t channel_coded[MAX_CHANNELS];    ///< true if channel is coded
    int exponents_bsize[MAX_CHANNELS];      ///< log2 ratio frame/exp. length
    DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
    float max_exponent[MAX_CHANNELS];
    WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
    DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
    DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2];
    FFTContext mdct_ctx[BLOCK_NB_SIZES];
    const float *windows[BLOCK_NB_SIZES];
    /* output buffer for one frame and the last for IMDCT windowing */
    DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
    /* last frame info */
    uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
    int last_bitoffset;
    int last_superframe_len;
    float noise_table[NOISE_TAB_SIZE];
    int noise_index;
    float noise_mult; /* XXX: suppress that and integrate it in the noise array */
    /* lsp_to_curve tables */
    float lsp_cos_table[BLOCK_MAX_SIZE];
    float lsp_pow_e_table[256];
    float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
    float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
    FmtConvertContext fmt_conv;
    AVFloatDSPContext *fdsp;

#ifdef TRACE
    int frame_count;
#endif /* TRACE */
} WMACodecContext;

extern const uint16_t ff_wma_hgain_huffcodes[37];
extern const uint8_t ff_wma_hgain_huffbits[37];
extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
extern const uint32_t ff_aac_scalefactor_code[121];
extern const uint8_t  ff_aac_scalefactor_bits[121];

int ff_wma_init(AVCodecContext *avctx, int flags2);
int ff_wma_total_gain_to_bits(int total_gain);
int ff_wma_end(AVCodecContext *avctx);
unsigned int ff_wma_get_large_val(GetBitContext *gb);
int ff_wma_run_level_decode(AVCodecContext *avctx, GetBitContext *gb,
                            VLC *vlc, const float *level_table,
                            const uint16_t *run_table, int version,
                            WMACoef *ptr, int offset, int num_coefs,
                            int block_len, int frame_len_bits,
                            int coef_nb_bits);

#endif /* AVCODEC_WMA_H */
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* WMA compatible codec
	3	* Copyright (c) 2002-2007 The FFmpeg Project
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#ifndef AVCODEC_WMA_H
	23	#define AVCODEC_WMA_H
	24
	25	#include "libavutil/float_dsp.h"
	26
	27	#include "fft.h"
	28	#include "fmtconvert.h"
	29	#include "get_bits.h"
	30	#include "put_bits.h"
	31
	32	/* size of blocks */
	33	#define BLOCK_MIN_BITS 7
	34	#define BLOCK_MAX_BITS 11
	35	#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
	36
	37	#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
	38
	39	/* XXX: find exact max size */
	40	#define HIGH_BAND_MAX_SIZE 16
	41
	42	#define NB_LSP_COEFS 10
	43
	44	/* XXX: is it a suitable value ? */
	45	#define MAX_CODED_SUPERFRAME_SIZE 16384
	46
	47	#define MAX_CHANNELS 2
	48
	49	#define NOISE_TAB_SIZE 8192
	50
	51	#define LSP_POW_BITS 7
	52
	53	// FIXME should be in wmadec
	54	#define VLCBITS 9
	55	#define VLCMAX ((22 + VLCBITS - 1) / VLCBITS)
	56
	57	typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2
	58
	59	typedef struct CoefVLCTable {
	60	int n; ///< total number of codes
	61	int max_level;
	62	const uint32_t *huffcodes; ///< VLC bit values
	63	const uint8_t *huffbits; ///< VLC bit size
	64	const uint16_t *levels; ///< table to build run/level tables
65	} CoefVLCTable;
66
67	typedef struct WMACodecContext {
68	AVCodecContext *avctx;
69	GetBitContext gb;
70	PutBitContext pb;
71	int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
72	int use_bit_reservoir;
73	int use_variable_block_len;
74	int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta
75	int use_noise_coding; ///< true if perceptual noise is added
76	int byte_offset_bits;
77	VLC exp_vlc;
78	int exponent_sizes[BLOCK_NB_SIZES];
79	uint16_t exponent_bands[BLOCK_NB_SIZES][25];
80	int high_band_start[BLOCK_NB_SIZES]; ///< index of first coef in high band
81	int coefs_start; ///< first coded coef
82	int coefs_end[BLOCK_NB_SIZES]; ///< max number of coded coefficients
83	int exponent_high_sizes[BLOCK_NB_SIZES];
84	int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
85	VLC hgain_vlc;
86
87	/* coded values in high bands */
88	int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
89	int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
90
91	/* there are two possible tables for spectral coefficients */
92	// FIXME the following 3 tables should be shared between decoders
93	VLC coef_vlc[2];
94	uint16_t *run_table[2];
95	float *level_table[2];
96	uint16_t *int_table[2];
97	const CoefVLCTable *coef_vlcs[2];
98	/* frame info */
99	int frame_len; ///< frame length in samples
100	int frame_len_bits; ///< frame_len = 1 << frame_len_bits
101	int nb_block_sizes; ///< number of block sizes
102	/* block info */
103	int reset_block_lengths;
104	int block_len_bits; ///< log2 of current block length
105	int next_block_len_bits; ///< log2 of next block length
106	int prev_block_len_bits; ///< log2 of prev block length
107	int block_len; ///< block length in samples
108	int block_num; ///< block number in current frame
109	int block_pos; ///< current position in frame
110	uint8_t ms_stereo; ///< true if mid/side stereo mode
111	uint8_t channel_coded[MAX_CHANNELS]; ///< true if channel is coded
112	int exponents_bsize[MAX_CHANNELS]; ///< log2 ratio frame/exp. length
113	DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
114	float max_exponent[MAX_CHANNELS];
115	WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
116	DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
117	DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2];
118	FFTContext mdct_ctx[BLOCK_NB_SIZES];
119	const float *windows[BLOCK_NB_SIZES];
120	/* output buffer for one frame and the last for IMDCT windowing */
121	DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
122	/* last frame info */
123	uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
124	int last_bitoffset;
125	int last_superframe_len;
126	float noise_table[NOISE_TAB_SIZE];
127	int noise_index;
128	float noise_mult; /* XXX: suppress that and integrate it in the noise array */
129	/* lsp_to_curve tables */
130	float lsp_cos_table[BLOCK_MAX_SIZE];
131	float lsp_pow_e_table[256];
132	float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
133	float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
134	FmtConvertContext fmt_conv;
f6fa7814	135	AVFloatDSPContext *fdsp;
2ba45a60 DM	136
	137	#ifdef TRACE
	138	int frame_count;
	139	#endif /* TRACE */
	140	} WMACodecContext;
	141
	142	extern const uint16_t ff_wma_hgain_huffcodes[37];
	143	extern const uint8_t ff_wma_hgain_huffbits[37];
	144	extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
	145	extern const uint32_t ff_aac_scalefactor_code[121];
	146	extern const uint8_t ff_aac_scalefactor_bits[121];
	147
	148	int ff_wma_init(AVCodecContext *avctx, int flags2);
	149	int ff_wma_total_gain_to_bits(int total_gain);
	150	int ff_wma_end(AVCodecContext *avctx);
	151	unsigned int ff_wma_get_large_val(GetBitContext *gb);
	152	int ff_wma_run_level_decode(AVCodecContext avctx, GetBitContext gb,
	153	VLC vlc, const float level_table,
	154	const uint16_t *run_table, int version,
	155	WMACoef *ptr, int offset, int num_coefs,
	156	int block_len, int frame_len_bits,
	157	int coef_nb_bits);
	158
	159	#endif /* AVCODEC_WMA_H */