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/*

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 * Copyright (c) 2004 Michael Niedermayer <[email protected]>

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 *

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 * This file is part of FFmpeg.

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 *

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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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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