FFmpeg: libswresample/swresample_internal.h Source File

FFmpeg
swresample_internal.h
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1 /*
2  * Copyright (C) 2011-2013 Michael Niedermayer (michaelni@gmx.at)
3  *
4  * This file is part of libswresample
5  *
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.
10  *
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.
15  *
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
19  */
20 
21 #ifndef SWR_INTERNAL_H
22 #define SWR_INTERNAL_H
23 
24 #include "swresample.h"
25 #include "libavutil/channel_layout.h"
26 #include "config.h"
27 
28  #define SQRT3_2 1.22474487139158904909 /* sqrt(3/2) */
29 
30  #define NS_TAPS 20
31 
32 #if ARCH_X86_64
33 typedef int64_t integer;
34 #else
35  typedef int integer;
36 #endif
37 
38  typedef void (mix_1_1_func_type)(void *out, const void *in, void *coeffp, integer index, integer len);
39  typedef void (mix_2_1_func_type)(void *out, const void *in1, const void *in2, void *coeffp, integer index1, integer index2, integer len);
40 
41  typedef void (mix_any_func_type)(uint8_t **out, const uint8_t **in1, void *coeffp, integer len);
42 
43 typedef struct AudioData{
44   uint8_t *ch[SWR_CH_MAX]; ///< samples buffer per channel
45  uint8_t *data; ///< samples buffer
46   int ch_count; ///< number of channels
47   int bps; ///< bytes per sample
48   int count; ///< number of samples
49   int planar; ///< 1 if planar audio, 0 otherwise
50   enum AVSampleFormat fmt; ///< sample format
51 } AudioData;
52 
53 struct DitherContext {
54   enum SwrDitherType method;
55   int noise_pos;
56   float scale;
57   float noise_scale; ///< Noise scale
58   int ns_taps; ///< Noise shaping dither taps
59   float ns_scale; ///< Noise shaping dither scale
60   float ns_scale_1; ///< Noise shaping dither scale^-1
61   int ns_pos; ///< Noise shaping dither position
62   float ns_coeffs[NS_TAPS]; ///< Noise shaping filter coefficients
63   float ns_errors[SWR_CH_MAX][2*NS_TAPS];
64   AudioData noise; ///< noise used for dithering
65   AudioData temp; ///< temporary storage when writing into the input buffer isnt possible
66   int output_sample_bits; ///< the number of used output bits, needed to scale dither correctly
67 };
68 
69  struct SwrContext {
70   const AVClass *av_class; ///< AVClass used for AVOption and av_log()
71   int log_level_offset; ///< logging level offset
72   void *log_ctx; ///< parent logging context
73   enum AVSampleFormat in_sample_fmt; ///< input sample format
74   enum AVSampleFormat int_sample_fmt; ///< internal sample format (AV_SAMPLE_FMT_FLTP or AV_SAMPLE_FMT_S16P)
75   enum AVSampleFormat out_sample_fmt; ///< output sample format
76   int64_t in_ch_layout; ///< input channel layout
77   int64_t out_ch_layout; ///< output channel layout
78   int in_sample_rate; ///< input sample rate
79   int out_sample_rate; ///< output sample rate
80   int flags; ///< miscellaneous flags such as SWR_FLAG_RESAMPLE
81   float slev; ///< surround mixing level
82   float clev; ///< center mixing level
83   float lfe_mix_level; ///< LFE mixing level
84   float rematrix_volume; ///< rematrixing volume coefficient
85   enum AVMatrixEncoding matrix_encoding; /**< matrixed stereo encoding */
86   const int *channel_map; ///< channel index (or -1 if muted channel) map
87   int used_ch_count; ///< number of used input channels (mapped channel count if channel_map, otherwise in.ch_count)
88   enum SwrEngine engine;
89 
90   struct DitherContext dither;
91 
92   int filter_size; /**< length of each FIR filter in the resampling filterbank relative to the cutoff frequency */
93   int phase_shift; /**< log2 of the number of entries in the resampling polyphase filterbank */
94   int linear_interp; /**< if 1 then the resampling FIR filter will be linearly interpolated */
95   double cutoff; /**< resampling cutoff frequency (swr: 6dB point; soxr: 0dB point). 1.0 corresponds to half the output sample rate */
96   enum SwrFilterType filter_type; /**< swr resampling filter type */
97   int kaiser_beta; /**< swr beta value for Kaiser window (only applicable if filter_type == AV_FILTER_TYPE_KAISER) */
98   double precision; /**< soxr resampling precision (in bits) */
99   int cheby; /**< soxr: if 1 then passband rolloff will be none (Chebyshev) & irrational ratio approximation precision will be higher */
100 
101   float min_compensation; ///< swr minimum below which no compensation will happen
102   float min_hard_compensation; ///< swr minimum below which no silence inject / sample drop will happen
103   float soft_compensation_duration; ///< swr duration over which soft compensation is applied
104   float max_soft_compensation; ///< swr maximum soft compensation in seconds over soft_compensation_duration
105   float async; ///< swr simple 1 parameter async, similar to ffmpegs -async
106   int64_t firstpts_in_samples; ///< swr first pts in samples
107 
108   int resample_first; ///< 1 if resampling must come first, 0 if rematrixing
109   int rematrix; ///< flag to indicate if rematrixing is needed (basically if input and output layouts mismatch)
110   int rematrix_custom; ///< flag to indicate that a custom matrix has been defined
111 
112   AudioData in; ///< input audio data
113   AudioData postin; ///< post-input audio data: used for rematrix/resample
114   AudioData midbuf; ///< intermediate audio data (postin/preout)
115   AudioData preout; ///< pre-output audio data: used for rematrix/resample
116   AudioData out; ///< converted output audio data
117   AudioData in_buffer; ///< cached audio data (convert and resample purpose)
118   AudioData silence; ///< temporary with silence
119   AudioData drop_temp; ///< temporary used to discard output
120   int in_buffer_index; ///< cached buffer position
121   int in_buffer_count; ///< cached buffer length
122   int resample_in_constraint; ///< 1 if the input end was reach before the output end, 0 otherwise
123   int flushed; ///< 1 if data is to be flushed and no further input is expected
124   int64_t outpts; ///< output PTS
125   int64_t firstpts; ///< first PTS
126   int drop_output; ///< number of output samples to drop
127 
128   struct AudioConvert *in_convert; ///< input conversion context
129   struct AudioConvert *out_convert; ///< output conversion context
130   struct AudioConvert *full_convert; ///< full conversion context (single conversion for input and output)
131   struct ResampleContext *resample; ///< resampling context
132   struct Resampler const *resampler; ///< resampler virtual function table
133 
134   float matrix[SWR_CH_MAX][SWR_CH_MAX]; ///< floating point rematrixing coefficients
135   uint8_t *native_matrix;
136   uint8_t *native_one;
137   uint8_t *native_simd_one;
138   uint8_t *native_simd_matrix;
139   int32_t matrix32[SWR_CH_MAX][SWR_CH_MAX]; ///< 17.15 fixed point rematrixing coefficients
140   uint8_t matrix_ch[SWR_CH_MAX][SWR_CH_MAX+1]; ///< Lists of input channels per output channel that have non zero rematrixing coefficients
141   mix_1_1_func_type *mix_1_1_f;
142   mix_1_1_func_type *mix_1_1_simd;
143 
144   mix_2_1_func_type *mix_2_1_f;
145   mix_2_1_func_type *mix_2_1_simd;
146 
147   mix_any_func_type *mix_any_f;
148 
149  /* TODO: callbacks for ASM optimizations */
150 };
151 
152 typedef struct ResampleContext * (* resample_init_func)(struct ResampleContext *c, int out_rate, int in_rate, int filter_size, int phase_shift, int linear,
153  double cutoff, enum AVSampleFormat format, enum SwrFilterType filter_type, int kaiser_beta, double precision, int cheby);
154  typedef void (* resample_free_func)(struct ResampleContext **c);
155  typedef int (* multiple_resample_func)(struct ResampleContext *c, AudioData *dst, int dst_size, AudioData *src, int src_size, int *consumed);
156  typedef int (* resample_flush_func)(struct SwrContext *c);
157  typedef int (* set_compensation_func)(struct ResampleContext *c, int sample_delta, int compensation_distance);
158  typedef int64_t (* get_delay_func)(struct SwrContext *s, int64_t base);
159 
160  struct Resampler {
161   resample_init_func init;
162   resample_free_func free;
163   multiple_resample_func multiple_resample;
164   resample_flush_func flush;
165   set_compensation_func set_compensation;
166   get_delay_func get_delay;
167 };
168 
169 extern struct Resampler const swri_resampler;
170 
171 int swri_realloc_audio(AudioData *a, int count);
172 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);
173 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);
174 int swri_resample_float(struct ResampleContext *c, float *dst, const float *src, int *consumed, int src_size, int dst_size, int update_ctx);
175 int swri_resample_double(struct ResampleContext *c,double *dst, const double *src, int *consumed, int src_size, int dst_size, int update_ctx);
176 
177 void swri_noise_shaping_int16 (SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);
178 void swri_noise_shaping_int32 (SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);
179 void swri_noise_shaping_float (SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);
180 void swri_noise_shaping_double(SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);
181 
182 int swri_rematrix_init(SwrContext *s);
183 void swri_rematrix_free(SwrContext *s);
184 int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy);
185 void swri_rematrix_init_x86(struct SwrContext *s);
186 
187 void swri_get_dither(SwrContext *s, void *dst, int len, unsigned seed, enum AVSampleFormat noise_fmt);
188 int swri_dither_init(SwrContext *s, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt);
189 
190 void swri_audio_convert_init_arm(struct AudioConvert *ac,
191  enum AVSampleFormat out_fmt,
192  enum AVSampleFormat in_fmt,
193  int channels);
194 void swri_audio_convert_init_x86(struct AudioConvert *ac,
195  enum AVSampleFormat out_fmt,
196  enum AVSampleFormat in_fmt,
197  int channels);
198 #endif
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