2 * Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
4 * This file is part of libswresample
6 * libswresample is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * libswresample is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with libswresample; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef SWR_INTERNAL_H
22 #define SWR_INTERNAL_H
24 #include "swresample.h"
26 typedef void (mix_1_1_func_type)(void *out, const void *in, void *coeffp, int index, int len);
27 typedef void (mix_2_1_func_type)(void *out, const void *in1, const void *in2, void *coeffp, int index1, int index2, int len);
29 typedef void (mix_any_func_type)(void **out, const void **in1, void *coeffp, int len);
31 typedef struct AudioData{
32 uint8_t *ch[SWR_CH_MAX]; ///< samples buffer per channel
33 uint8_t *data; ///< samples buffer
34 int ch_count; ///< number of channels
35 int bps; ///< bytes per sample
36 int count; ///< number of samples
37 int planar; ///< 1 if planar audio, 0 otherwise
38 enum AVSampleFormat fmt; ///< sample format
42 const AVClass *av_class; ///< AVClass used for AVOption and av_log()
43 int log_level_offset; ///< logging level offset
44 void *log_ctx; ///< parent logging context
45 enum AVSampleFormat in_sample_fmt; ///< input sample format
46 enum AVSampleFormat int_sample_fmt; ///< internal sample format (AV_SAMPLE_FMT_FLTP or AV_SAMPLE_FMT_S16P)
47 enum AVSampleFormat out_sample_fmt; ///< output sample format
48 int64_t in_ch_layout; ///< input channel layout
49 int64_t out_ch_layout; ///< output channel layout
50 int in_sample_rate; ///< input sample rate
51 int out_sample_rate; ///< output sample rate
52 int flags; ///< miscellaneous flags such as SWR_FLAG_RESAMPLE
53 float slev; ///< surround mixing level
54 float clev; ///< center mixing level
55 float lfe_mix_level; ///< LFE mixing level
56 float rematrix_volume; ///< rematrixing volume coefficient
57 const int *channel_map; ///< channel index (or -1 if muted channel) map
58 int used_ch_count; ///< number of used input channels (mapped channel count if channel_map, otherwise in.ch_count)
59 enum SwrDitherType dither_method;
62 int filter_size; /**< length of each FIR filter in the resampling filterbank relative to the cutoff frequency */
63 int phase_shift; /**< log2 of the number of entries in the resampling polyphase filterbank */
64 int linear_interp; /**< if 1 then the resampling FIR filter will be linearly interpolated */
65 double cutoff; /**< resampling cutoff frequency. 1.0 corresponds to half the output sample rate */
67 float min_compensation; ///< minimum below which no compensation will happen
68 float min_hard_compensation; ///< minimum below which no silence inject / sample drop will happen
69 float soft_compensation_duration; ///< duration over which soft compensation is applied
70 float max_soft_compensation; ///< maximum soft compensation in seconds over soft_compensation_duration
72 int resample_first; ///< 1 if resampling must come first, 0 if rematrixing
73 int rematrix; ///< flag to indicate if rematrixing is needed (basically if input and output layouts mismatch)
74 int rematrix_custom; ///< flag to indicate that a custom matrix has been defined
76 AudioData in; ///< input audio data
77 AudioData postin; ///< post-input audio data: used for rematrix/resample
78 AudioData midbuf; ///< intermediate audio data (postin/preout)
79 AudioData preout; ///< pre-output audio data: used for rematrix/resample
80 AudioData out; ///< converted output audio data
81 AudioData in_buffer; ///< cached audio data (convert and resample purpose)
82 AudioData dither; ///< noise used for dithering
83 int in_buffer_index; ///< cached buffer position
84 int in_buffer_count; ///< cached buffer length
85 int resample_in_constraint; ///< 1 if the input end was reach before the output end, 0 otherwise
86 int flushed; ///< 1 if data is to be flushed and no further input is expected
87 int64_t outpts; ///< output PTS
88 int drop_output; ///< number of output samples to drop
90 struct AudioConvert *in_convert; ///< input conversion context
91 struct AudioConvert *out_convert; ///< output conversion context
92 struct AudioConvert *full_convert; ///< full conversion context (single conversion for input and output)
93 struct ResampleContext *resample; ///< resampling context
95 float matrix[SWR_CH_MAX][SWR_CH_MAX]; ///< floating point rematrixing coefficients
96 uint8_t *native_matrix;
98 uint8_t *native_simd_matrix;
99 int32_t matrix32[SWR_CH_MAX][SWR_CH_MAX]; ///< 17.15 fixed point rematrixing coefficients
100 uint8_t matrix_ch[SWR_CH_MAX][SWR_CH_MAX+1]; ///< Lists of input channels per output channel that have non zero rematrixing coefficients
101 mix_1_1_func_type *mix_1_1_f;
102 mix_1_1_func_type *mix_1_1_simd;
104 mix_2_1_func_type *mix_2_1_f;
105 mix_2_1_func_type *mix_2_1_simd;
107 mix_any_func_type *mix_any_f;
109 /* TODO: callbacks for ASM optimizations */
112 struct ResampleContext *swri_resample_init(struct ResampleContext *, int out_rate, int in_rate, int filter_size, int phase_shift, int linear, double cutoff, enum AVSampleFormat);
113 void swri_resample_free(struct ResampleContext **c);
114 int swri_multiple_resample(struct ResampleContext *c, AudioData *dst, int dst_size, AudioData *src, int src_size, int *consumed);
115 void swri_resample_compensate(struct ResampleContext *c, int sample_delta, int compensation_distance);
116 int swri_resample_int16(struct ResampleContext *c, int16_t *dst, const int16_t *src, int *consumed, int src_size, int dst_size, int update_ctx);
117 int swri_resample_int32(struct ResampleContext *c, int32_t *dst, const int32_t *src, int *consumed, int src_size, int dst_size, int update_ctx);
118 int swri_resample_float(struct ResampleContext *c, float *dst, const float *src, int *consumed, int src_size, int dst_size, int update_ctx);
119 int swri_resample_double(struct ResampleContext *c,double *dst, const double *src, int *consumed, int src_size, int dst_size, int update_ctx);
121 int swri_rematrix_init(SwrContext *s);
122 void swri_rematrix_free(SwrContext *s);
123 int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy);
125 void swri_get_dither(SwrContext *s, void *dst, int len, unsigned seed, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt);
127 void swri_audio_convert_init_x86(struct AudioConvert *ac,
128 enum AVSampleFormat out_fmt,
129 enum AVSampleFormat in_fmt,