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 struct AudioData{
27 uint8_t *ch[SWR_CH_MAX]; ///< samples buffer per channel
28 uint8_t *data; ///< samples buffer
29 int ch_count; ///< number of channels
30 int bps; ///< bytes per sample
31 int count; ///< number of samples
32 int planar; ///< 1 if planar audio, 0 otherwise
35 typedef struct SwrContext {
36 const AVClass *av_class; ///< AVClass used for AVOption and av_log()
37 int log_level_offset; ///< logging level offset
38 void *log_ctx; ///< parent logging context
39 enum AVSampleFormat in_sample_fmt; ///< input sample format
40 enum AVSampleFormat int_sample_fmt; ///< internal sample format (AV_SAMPLE_FMT_FLT or AV_SAMPLE_FMT_S16)
41 enum AVSampleFormat out_sample_fmt; ///< output sample format
42 int64_t in_ch_layout; ///< input channel layout
43 int64_t out_ch_layout; ///< output channel layout
44 int in_sample_rate; ///< input sample rate
45 int out_sample_rate; ///< output sample rate
46 int flags; ///< miscellaneous flags such as SWR_FLAG_RESAMPLE
47 float slev; ///< surround mixing level
48 float clev; ///< center mixing level
49 float rematrix_volume; ///< rematrixing volume coefficient
50 const int *channel_map; ///< channel index (or -1 if muted channel) map
51 int used_ch_count; ///< number of used input channels (mapped channel count if channel_map, otherwise in.ch_count)
53 int int_bps; ///< internal bytes per sample
54 int resample_first; ///< 1 if resampling must come first, 0 if rematrixing
55 int rematrix; ///< flag to indicate if rematrixing is needed (basically if input and output layouts mismatch)
56 int rematrix_custom; ///< flag to indicate that a custom matrix has been defined
58 AudioData in; ///< input audio data
59 AudioData postin; ///< post-input audio data: used for rematrix/resample
60 AudioData midbuf; ///< intermediate audio data (postin/preout)
61 AudioData preout; ///< pre-output audio data: used for rematrix/resample
62 AudioData out; ///< converted output audio data
63 AudioData in_buffer; ///< cached audio data (convert and resample purpose)
64 int in_buffer_index; ///< cached buffer position
65 int in_buffer_count; ///< cached buffer length
66 int resample_in_constraint; ///< 1 if the input end was reach before the output end, 0 otherwise
68 struct AudioConvert *in_convert; ///< input conversion context
69 struct AudioConvert *out_convert; ///< output conversion context
70 struct AudioConvert *full_convert; ///< full conversion context (single conversion for input and output)
71 struct ResampleContext *resample; ///< resampling context
73 float matrix[SWR_CH_MAX][SWR_CH_MAX]; ///< floating point rematrixing coefficients
74 int32_t matrix32[SWR_CH_MAX][SWR_CH_MAX]; ///< 17.15 fixed point rematrixing coefficients
75 uint8_t matrix_ch[SWR_CH_MAX][SWR_CH_MAX+1]; ///< Lists of input channels per output channel that have non zero rematrixing coefficients
77 /* TODO: callbacks for ASM optimizations */
80 struct ResampleContext *swri_resample_init(struct ResampleContext *, int out_rate, int in_rate, int filter_size, int phase_shift, int linear, double cutoff);
81 void swri_resample_free(struct ResampleContext **c);
82 int swri_multiple_resample(struct ResampleContext *c, AudioData *dst, int dst_size, AudioData *src, int src_size, int *consumed);
83 void swri_resample_compensate(struct ResampleContext *c, int sample_delta, int compensation_distance);
84 int swri_resample(struct ResampleContext *c, int16_t *dst, const int16_t *src, int *consumed, int src_size, int dst_size, int update_ctx);
86 int swri_rematrix_init(SwrContext *s);
87 int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy);