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/*

 * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram 

 * Copyright (c) 2011 Stefano Sabatini

 * Copyright (c) 2011 Mina Nagy Zaki

 *

 * 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

 */

/**

 * @file

 * sample format and channel layout conversion audio filter

 */

#include "libavutil/channel_layout.h"

#include "libavutil/opt.h"

#include "libswresample/swresample.h"

#include "avfilter.h"

#include "audio.h"

#include "internal.h"

typedef struct {

    const AVClass       *class;

    enum AVSampleFormat  out_sample_fmt;

    int64_t              out_chlayout;

    struct SwrContext *swr;

    char *format_str;

    char *channel_layout_str;

} AConvertContext;

#define OFFSET(x) offsetof(AConvertContext, x)

#define A AV_OPT_FLAG_AUDIO_PARAM

#define F AV_OPT_FLAG_FILTERING_PARAM

static const AVOption aconvert_options[] = {

    { "sample_fmt",     "", OFFSET(format_str),         AV_OPT_TYPE_STRING, .flags = A|F },

    { "channel_layout", "", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A|F },

    { NULL }

};

AVFILTER_DEFINE_CLASS(aconvert);

static av_cold int init(AVFilterContext *ctx)

{

    AConvertContext *aconvert = ctx->priv;

    int ret = 0;

    av_log(ctx, AV_LOG_WARNING, "This filter is deprecated, use aformat instead\n");

    aconvert->out_sample_fmt  = AV_SAMPLE_FMT_NONE;

    aconvert->out_chlayout    = 0;

    if (aconvert->format_str && strcmp(aconvert->format_str, "auto") &&

        (ret = ff_parse_sample_format(&aconvert->out_sample_fmt, aconvert->format_str, ctx)) < 0)

        return ret;

    if (aconvert->channel_layout_str && strcmp(aconvert->channel_layout_str, "auto"))

        return ff_parse_channel_layout(&aconvert->out_chlayout, aconvert->channel_layout_str, ctx);

    return ret;

}

static av_cold void uninit(AVFilterContext *ctx)

{

    AConvertContext *aconvert = ctx->priv;

    swr_free(&aconvert->swr);

}

static int query_formats(AVFilterContext *ctx)

{

    AVFilterFormats *formats = NULL;

    AConvertContext *aconvert = ctx->priv;

    AVFilterLink *inlink  = ctx->inputs[0];

    AVFilterLink *outlink = ctx->outputs[0];

    AVFilterChannelLayouts *layouts;

    ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_AUDIO),

                         &inlink->out_formats);

    if (aconvert->out_sample_fmt != AV_SAMPLE_FMT_NONE) {

        formats = NULL;

        ff_add_format(&formats, aconvert->out_sample_fmt);

        ff_formats_ref(formats, &outlink->in_formats);

    } else

        ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_AUDIO),

                             &outlink->in_formats);

    ff_channel_layouts_ref(ff_all_channel_layouts(),

                         &inlink->out_channel_layouts);

    if (aconvert->out_chlayout != 0) {

        layouts = NULL;

        ff_add_channel_layout(&layouts, aconvert->out_chlayout);

        ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts);

    } else

        ff_channel_layouts_ref(ff_all_channel_layouts(),

                             &outlink->in_channel_layouts);

    return 0;

}

static int config_output(AVFilterLink *outlink)

{

    int ret;

    AVFilterContext *ctx = outlink->src;

    AVFilterLink *inlink = ctx->inputs[0];

    AConvertContext *aconvert = ctx->priv;

    char buf1[64], buf2[64];

    /* if not specified in args, use the format and layout of the output */

    if (aconvert->out_sample_fmt == AV_SAMPLE_FMT_NONE)

        aconvert->out_sample_fmt = outlink->format;

    if (aconvert->out_chlayout   == 0)

        aconvert->out_chlayout   = outlink->channel_layout;

    aconvert->swr = swr_alloc_set_opts(aconvert->swr,

                                       aconvert->out_chlayout, aconvert->out_sample_fmt, inlink->sample_rate,

                                       inlink->channel_layout, inlink->format,           inlink->sample_rate,

                                       0, ctx);

    if (!aconvert->swr)

        return AVERROR(ENOMEM);

    ret = swr_init(aconvert->swr);

    if (ret < 0)

        return ret;

    av_get_channel_layout_string(buf1, sizeof(buf1),

                                 -1, inlink ->channel_layout);

    av_get_channel_layout_string(buf2, sizeof(buf2),

                                 -1, outlink->channel_layout);

    av_log(ctx, AV_LOG_VERBOSE,

           "fmt:%s cl:%s -> fmt:%s cl:%s\n",

           av_get_sample_fmt_name(inlink ->format), buf1,

           av_get_sample_fmt_name(outlink->format), buf2);

    return 0;

}

static int  filter_frame(AVFilterLink *inlink, AVFrame *insamplesref)

{

    AConvertContext *aconvert = inlink->dst->priv;

    const int n = insamplesref->nb_samples;

    AVFilterLink *const outlink = inlink->dst->outputs[0];

    AVFrame *outsamplesref = ff_get_audio_buffer(outlink, n);

    int ret;

    if (!outsamplesref)

        return AVERROR(ENOMEM);

    swr_convert(aconvert->swr, outsamplesref->extended_data, n,

                        (void *)insamplesref->extended_data, n);

    av_frame_copy_props(outsamplesref, insamplesref);

    av_frame_set_channels(outsamplesref, outlink->channels);

    outsamplesref->channel_layout = outlink->channel_layout;

    ret = ff_filter_frame(outlink, outsamplesref);

    av_frame_free(&insamplesref);

    return ret;

}

static const AVFilterPad aconvert_inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_AUDIO,

        .filter_frame = filter_frame,

    },

    { NULL }

};

static const AVFilterPad aconvert_outputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_AUDIO,

        .config_props = config_output,

    },

    { NULL }

};

AVFilter avfilter_af_aconvert = {

    .name          = "aconvert",

    .description   = NULL_IF_CONFIG_SMALL("Convert the input audio to sample_fmt:channel_layout."),

    .priv_size     = sizeof(AConvertContext),

    .priv_class    = &aconvert_class,

    .init          = init,

    .uninit        = uninit,

    .query_formats = query_formats,

    .inputs        = aconvert_inputs,

    .outputs       = aconvert_outputs,

};