91 lines
5.5 KiB
C
91 lines
5.5 KiB
C
/*
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* Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
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*
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* This file is part of libswresample
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*
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* libswresample is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* libswresample is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with libswresample; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef SWR_INTERNAL_H
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#define SWR_INTERNAL_H
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#include "swresample.h"
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typedef struct AudioData{
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uint8_t *ch[SWR_CH_MAX]; ///< samples buffer per channel
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uint8_t *data; ///< samples buffer
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int ch_count; ///< number of channels
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int bps; ///< bytes per sample
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int count; ///< number of samples
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int planar; ///< 1 if planar audio, 0 otherwise
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} AudioData;
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struct SwrContext {
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const AVClass *av_class; ///< AVClass used for AVOption and av_log()
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int log_level_offset; ///< logging level offset
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void *log_ctx; ///< parent logging context
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enum AVSampleFormat in_sample_fmt; ///< input sample format
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enum AVSampleFormat int_sample_fmt; ///< internal sample format (AV_SAMPLE_FMT_FLT or AV_SAMPLE_FMT_S16)
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enum AVSampleFormat out_sample_fmt; ///< output sample format
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int64_t in_ch_layout; ///< input channel layout
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int64_t out_ch_layout; ///< output channel layout
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int in_sample_rate; ///< input sample rate
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int out_sample_rate; ///< output sample rate
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int flags; ///< miscellaneous flags such as SWR_FLAG_RESAMPLE
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float slev; ///< surround mixing level
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float clev; ///< center mixing level
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float rematrix_volume; ///< rematrixing volume coefficient
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const int *channel_map; ///< channel index (or -1 if muted channel) map
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int used_ch_count; ///< number of used input channels (mapped channel count if channel_map, otherwise in.ch_count)
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int int_bps; ///< internal bytes per sample
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int resample_first; ///< 1 if resampling must come first, 0 if rematrixing
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int rematrix; ///< flag to indicate if rematrixing is needed (basically if input and output layouts mismatch)
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int rematrix_custom; ///< flag to indicate that a custom matrix has been defined
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AudioData in; ///< input audio data
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AudioData postin; ///< post-input audio data: used for rematrix/resample
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AudioData midbuf; ///< intermediate audio data (postin/preout)
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AudioData preout; ///< pre-output audio data: used for rematrix/resample
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AudioData out; ///< converted output audio data
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AudioData in_buffer; ///< cached audio data (convert and resample purpose)
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int in_buffer_index; ///< cached buffer position
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int in_buffer_count; ///< cached buffer length
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int resample_in_constraint; ///< 1 if the input end was reach before the output end, 0 otherwise
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int flushed; ///< 1 if data is to be flushed and no further input is expected
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struct AudioConvert *in_convert; ///< input conversion context
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struct AudioConvert *out_convert; ///< output conversion context
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struct AudioConvert *full_convert; ///< full conversion context (single conversion for input and output)
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struct ResampleContext *resample; ///< resampling context
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float matrix[SWR_CH_MAX][SWR_CH_MAX]; ///< floating point rematrixing coefficients
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int32_t matrix32[SWR_CH_MAX][SWR_CH_MAX]; ///< 17.15 fixed point rematrixing coefficients
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uint8_t matrix_ch[SWR_CH_MAX][SWR_CH_MAX+1]; ///< Lists of input channels per output channel that have non zero rematrixing coefficients
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/* TODO: callbacks for ASM optimizations */
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};
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struct ResampleContext *swri_resample_init(struct ResampleContext *, int out_rate, int in_rate, int filter_size, int phase_shift, int linear, double cutoff);
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void swri_resample_free(struct ResampleContext **c);
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int swri_multiple_resample(struct ResampleContext *c, AudioData *dst, int dst_size, AudioData *src, int src_size, int *consumed);
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void swri_resample_compensate(struct ResampleContext *c, int sample_delta, int compensation_distance);
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int swri_resample(struct ResampleContext *c, int16_t *dst, const int16_t *src, int *consumed, int src_size, int dst_size, int update_ctx);
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int swri_rematrix_init(SwrContext *s);
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int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy);
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#endif
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