|
- /*
- * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
- #ifndef AVRESAMPLE_RESAMPLE_H
- #define AVRESAMPLE_RESAMPLE_H
-
- #include "avresample.h"
- #include "internal.h"
- #include "audio_data.h"
-
- struct ResampleContext {
- AVAudioResampleContext *avr;
- AudioData *buffer;
- uint8_t *filter_bank;
- int filter_length;
- int ideal_dst_incr;
- int dst_incr;
- unsigned int index;
- int frac;
- int src_incr;
- int compensation_distance;
- int phase_shift;
- int phase_mask;
- int linear;
- enum AVResampleFilterType filter_type;
- int kaiser_beta;
- void (*set_filter)(void *filter, double *tab, int phase, int tap_count);
- void (*resample_one)(struct ResampleContext *c, void *dst0,
- int dst_index, const void *src0,
- unsigned int index, int frac);
- void (*resample_nearest)(void *dst0, int dst_index,
- const void *src0, unsigned int index);
- int padding_size;
- int initial_padding_filled;
- int initial_padding_samples;
- int final_padding_filled;
- int final_padding_samples;
- };
-
- /**
- * Allocate and initialize a ResampleContext.
- *
- * The parameters in the AVAudioResampleContext are used to initialize the
- * ResampleContext.
- *
- * @param avr AVAudioResampleContext
- * @return newly-allocated ResampleContext
- */
- ResampleContext *ff_audio_resample_init(AVAudioResampleContext *avr);
-
- /**
- * Free a ResampleContext.
- *
- * @param c ResampleContext
- */
- void ff_audio_resample_free(ResampleContext **c);
-
- /**
- * Resample audio data.
- *
- * Changes the sample rate.
- *
- * @par
- * All samples in the source data may not be consumed depending on the
- * resampling parameters and the size of the output buffer. The unconsumed
- * samples are automatically added to the start of the source in the next call.
- * If the destination data can be reallocated, that may be done in this function
- * in order to fit all available output. If it cannot be reallocated, fewer
- * input samples will be consumed in order to have the output fit in the
- * destination data buffers.
- *
- * @param c ResampleContext
- * @param dst destination audio data
- * @param src source audio data
- * @return 0 on success, negative AVERROR code on failure
- */
- int ff_audio_resample(ResampleContext *c, AudioData *dst, AudioData *src);
-
- #endif /* AVRESAMPLE_RESAMPLE_H */
|