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/*
* Copyright (c) Stefano Sabatini | stefasab at gmail.com
* Copyright (c) S.N. Hemanth Meenakshisundaram | smeenaks at ucsd.edu
*
* 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 AVFILTER_AUDIO_H
#define AVFILTER_AUDIO_H

#include "avfilter.h"
#include "internal.h"

static const enum AVSampleFormat ff_packed_sample_fmts_array[] = {
    AV_SAMPLE_FMT_U8,
    AV_SAMPLE_FMT_S16,
    AV_SAMPLE_FMT_S32,
    AV_SAMPLE_FMT_FLT,
    AV_SAMPLE_FMT_DBL,
    AV_SAMPLE_FMT_NONE
};

static const enum AVSampleFormat ff_planar_sample_fmts_array[] = {
    AV_SAMPLE_FMT_U8P,
    AV_SAMPLE_FMT_S16P,
    AV_SAMPLE_FMT_S32P,
    AV_SAMPLE_FMT_FLTP,
    AV_SAMPLE_FMT_DBLP,
    AV_SAMPLE_FMT_NONE
};

/** default handler for get_audio_buffer() for audio inputs */
AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples);

/** get_audio_buffer() handler for filters which simply pass audio along */
AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples);

/**
* Request an audio samples buffer with a specific set of permissions.
*
* @param link the output link to the filter from which the buffer will
* be requested
* @param nb_samples the number of samples per channel
* @return A reference to the samples. This must be unreferenced with
* avfilter_unref_buffer when you are finished with it.
*/
AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples);

/**
* Send a buffer of audio samples to the next filter.
*
* @param link the output link over which the audio samples are being sent
* @param samplesref a reference to the buffer of audio samples being sent. The
* receiving filter will free this reference when it no longer
* needs it or pass it on to the next filter.
*
* @return >= 0 on success, a negative AVERROR on error. The receiving filter
* is responsible for unreferencing samplesref in case of error.
*/
int ff_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);

/**
* Send a buffer of audio samples to the next link, without checking
* min_samples.
*/
int ff_filter_samples_framed(AVFilterLink *link,
                             AVFilterBufferRef *samplesref);

#endif /* AVFILTER_AUDIO_H */
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