FFmpeg
atrac.h
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1 /*
2  * common functions for the ATRAC family of decoders
3  *
4  * Copyright (c) 2009-2013 Maxim Poliakovski
5  * Copyright (c) 2009 Benjamin Larsson
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 /**
25  * @file
26  * ATRAC common header
27  */
28 
29 #ifndef AVCODEC_ATRAC_H
30 #define AVCODEC_ATRAC_H
31 
32 /**
33  * Gain control parameters for one subband.
34  */
35 typedef struct AtracGainInfo {
36  int num_points; ///< number of gain control points
37  int lev_code[7]; ///< level at corresponding control point
38  int loc_code[7]; ///< location of gain control points
40 
41 /**
42  * Gain compensation context structure.
43  */
44 typedef struct AtracGCContext {
45  float gain_tab1[16]; ///< gain compensation level table
46  float gain_tab2[31]; ///< gain compensation interpolation table
47  int id2exp_offset; ///< offset for converting level index into level exponent
48  int loc_scale; ///< scale of location code = 2^loc_scale samples
49  int loc_size; ///< size of location code in samples
51 
52 extern float ff_atrac_sf_table[64];
53 
54 /**
55  * Generate common tables.
56  */
57 void ff_atrac_generate_tables(void);
58 
59 /**
60  * Initialize gain compensation context.
61  *
62  * @param gctx pointer to gain compensation context to initialize
63  * @param id2exp_offset offset for converting level index into level exponent
64  * @param loc_scale location size factor
65  */
66 void ff_atrac_init_gain_compensation(AtracGCContext *gctx, int id2exp_offset,
67  int loc_scale);
68 
69 /**
70  * Apply gain compensation and perform the MDCT overlapping part.
71  *
72  * @param gctx pointer to gain compensation context
73  * @param in input buffer
74  * @param prev previous buffer to perform overlap against
75  * @param gc_now gain control information for current frame
76  * @param gc_next gain control information for next frame
77  * @param num_samples number of samples to process
78  * @param out output data goes here
79  */
80 void ff_atrac_gain_compensation(AtracGCContext *gctx, float *in, float *prev,
81  AtracGainInfo *gc_now, AtracGainInfo *gc_next,
82  int num_samples, float *out);
83 
84 /**
85  * Quadrature mirror synthesis filter.
86  *
87  * @param inlo lower part of spectrum
88  * @param inhi higher part of spectrum
89  * @param nIn size of spectrum buffer
90  * @param pOut out buffer
91  * @param delayBuf delayBuf buffer
92  * @param temp temp buffer
93  */
94 void ff_atrac_iqmf(float *inlo, float *inhi, unsigned int nIn, float *pOut,
95  float *delayBuf, float *temp);
96 
97 #endif /* AVCODEC_ATRAC_H */
else temp
Definition: vf_mcdeint.c:256
void ff_atrac_init_gain_compensation(AtracGCContext *gctx, int id2exp_offset, int loc_scale)
Initialize gain compensation context.
Definition: atrac.c:66
int lev_code[7]
level at corresponding control point
Definition: atrac.h:37
int loc_code[7]
location of gain control points
Definition: atrac.h:38
Gain compensation context structure.
Definition: atrac.h:44
void ff_atrac_gain_compensation(AtracGCContext *gctx, float *in, float *prev, AtracGainInfo *gc_now, AtracGainInfo *gc_next, int num_samples, float *out)
Apply gain compensation and perform the MDCT overlapping part.
Definition: atrac.c:84
int loc_scale
scale of location code = 2^loc_scale samples
Definition: atrac.h:48
float ff_atrac_sf_table[64]
Definition: atrac.c:36
Gain control parameters for one subband.
Definition: atrac.h:35
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
int loc_size
size of location code in samples
Definition: atrac.h:49
int id2exp_offset
offset for converting level index into level exponent
Definition: atrac.h:47
int num_points
number of gain control points
Definition: atrac.h:36
void ff_atrac_generate_tables(void)
Generate common tables.
Definition: atrac.c:48
void ff_atrac_iqmf(float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp)
Quadrature mirror synthesis filter.
Definition: atrac.c:127
FILE * out
Definition: movenc.c:54