| /* |
| * Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at) |
| * |
| * This file is part of libswresample |
| * |
| * libswresample is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * libswresample is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with libswresample; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef SWR_INTERNAL_H |
| #define SWR_INTERNAL_H |
| |
| #include "swresample.h" |
| |
| typedef struct AudioData{ |
| uint8_t *ch[SWR_CH_MAX]; ///< samples buffer per channel |
| uint8_t *data; ///< samples buffer |
| int ch_count; ///< number of channels |
| int bps; ///< bytes per sample |
| int count; ///< number of samples |
| int planar; ///< 1 if planar audio, 0 otherwise |
| } AudioData; |
| |
| typedef struct SwrContext { |
| const AVClass *av_class; ///< AVClass used for AVOption and av_log() |
| int log_level_offset; ///< logging level offset |
| void *log_ctx; ///< parent logging context |
| enum AVSampleFormat in_sample_fmt; ///< input sample format |
| enum AVSampleFormat int_sample_fmt; ///< internal sample format (AV_SAMPLE_FMT_FLT or AV_SAMPLE_FMT_S16) |
| enum AVSampleFormat out_sample_fmt; ///< output sample format |
| int64_t in_ch_layout; ///< input channel layout |
| int64_t out_ch_layout; ///< output channel layout |
| int in_sample_rate; ///< input sample rate |
| int out_sample_rate; ///< output sample rate |
| int flags; ///< miscellaneous flags such as SWR_FLAG_RESAMPLE |
| float slev; ///< surround mixing level |
| float clev; ///< center mixing level |
| float rematrix_volume; ///< rematrixing volume coefficient |
| const int *channel_map; ///< channel index (or -1 if muted channel) map |
| int used_ch_count; ///< number of used input channels (mapped channel count if channel_map, otherwise in.ch_count) |
| |
| int int_bps; ///< internal bytes per sample |
| int resample_first; ///< 1 if resampling must come first, 0 if rematrixing |
| int rematrix; ///< flag to indicate if rematrixing is needed (basically if input and output layouts mismatch) |
| |
| AudioData in; ///< input audio data |
| AudioData postin; ///< post-input audio data: used for rematrix/resample |
| AudioData midbuf; ///< intermediate audio data (postin/preout) |
| AudioData preout; ///< pre-output audio data: used for rematrix/resample |
| AudioData out; ///< converted output audio data |
| AudioData in_buffer; ///< cached audio data (convert and resample purpose) |
| int in_buffer_index; ///< cached buffer position |
| int in_buffer_count; ///< cached buffer length |
| int resample_in_constraint; ///< 1 if the input end was reach before the output end, 0 otherwise |
| |
| struct AudioConvert *in_convert; ///< input conversion context |
| struct AudioConvert *out_convert; ///< output conversion context |
| struct AudioConvert *full_convert; ///< full conversion context (single conversion for input and output) |
| struct ResampleContext *resample; ///< resampling context |
| |
| float matrix[SWR_CH_MAX][SWR_CH_MAX]; ///< floating point rematrixing coefficients |
| int32_t matrix32[SWR_CH_MAX][SWR_CH_MAX]; ///< 17.15 fixed point rematrixing coefficients |
| uint8_t matrix_ch[SWR_CH_MAX][SWR_CH_MAX+1]; ///< Lists of input channels per output channel that have non zero rematrixing coefficients |
| |
| /* TODO: callbacks for ASM optimizations */ |
| }SwrContext; |
| |
| struct ResampleContext *swri_resample_init(struct ResampleContext *, int out_rate, int in_rate, int filter_size, int phase_shift, int linear, double cutoff); |
| void swri_resample_free(struct ResampleContext **c); |
| int swri_multiple_resample(struct ResampleContext *c, AudioData *dst, int dst_size, AudioData *src, int src_size, int *consumed); |
| void swri_resample_compensate(struct ResampleContext *c, int sample_delta, int compensation_distance); |
| int swri_resample(struct ResampleContext *c, int16_t *dst, const int16_t *src, int *consumed, int src_size, int dst_size, int update_ctx); |
| |
| int swri_rematrix_init(SwrContext *s); |
| int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy); |
| |
| #endif |