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96 lines
3.1 KiB
96 lines
3.1 KiB
/* |
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* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 AVRESAMPLE_RESAMPLE_H |
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#define AVRESAMPLE_RESAMPLE_H |
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#include "avresample.h" |
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#include "internal.h" |
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#include "audio_data.h" |
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struct ResampleContext { |
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AVAudioResampleContext *avr; |
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AudioData *buffer; |
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uint8_t *filter_bank; |
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int filter_length; |
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int ideal_dst_incr; |
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int dst_incr; |
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unsigned int index; |
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int frac; |
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int src_incr; |
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int compensation_distance; |
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int phase_shift; |
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int phase_mask; |
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int linear; |
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enum AVResampleFilterType filter_type; |
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int kaiser_beta; |
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void (*set_filter)(void *filter, double *tab, int phase, int tap_count); |
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void (*resample_one)(struct ResampleContext *c, void *dst0, |
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int dst_index, const void *src0, |
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unsigned int index, int frac); |
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void (*resample_nearest)(void *dst0, int dst_index, |
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const void *src0, unsigned int index); |
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int padding_size; |
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int initial_padding_filled; |
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int initial_padding_samples; |
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int final_padding_filled; |
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int final_padding_samples; |
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}; |
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/** |
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* Allocate and initialize a ResampleContext. |
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* |
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* The parameters in the AVAudioResampleContext are used to initialize the |
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* ResampleContext. |
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* |
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* @param avr AVAudioResampleContext |
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* @return newly-allocated ResampleContext |
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*/ |
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ResampleContext *ff_audio_resample_init(AVAudioResampleContext *avr); |
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/** |
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* Free a ResampleContext. |
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* |
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* @param c ResampleContext |
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*/ |
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void ff_audio_resample_free(ResampleContext **c); |
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/** |
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* Resample audio data. |
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* |
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* Changes the sample rate. |
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* |
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* @par |
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* All samples in the source data may not be consumed depending on the |
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* resampling parameters and the size of the output buffer. The unconsumed |
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* samples are automatically added to the start of the source in the next call. |
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* If the destination data can be reallocated, that may be done in this function |
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* in order to fit all available output. If it cannot be reallocated, fewer |
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* input samples will be consumed in order to have the output fit in the |
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* destination data buffers. |
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* |
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* @param c ResampleContext |
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* @param dst destination audio data |
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* @param src source audio data |
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* @return 0 on success, negative AVERROR code on failure |
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*/ |
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int ff_audio_resample(ResampleContext *c, AudioData *dst, AudioData *src); |
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#endif /* AVRESAMPLE_RESAMPLE_H */
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