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/*

 * Copyright (c) 2011 Nicolas George 

 *

 * 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

 * Audio merging filter

 */

#include "libavutil/avstring.h"

#include "libavutil/bprint.h"

#include "libavutil/channel_layout.h"

#include "libavutil/opt.h"

#include "libswresample/swresample.h" // only for SWR_CH_MAX

#include "avfilter.h"

#include "audio.h"

#include "bufferqueue.h"

#include "internal.h"

typedef struct {

    const AVClass *class;

    int nb_inputs;

    int route[SWR_CH_MAX]; /**< channels routing, see copy_samples */

    int bps;

    struct amerge_input {

        struct FFBufQueue queue;

        int nb_ch;         /**< number of channels for the input */

        int nb_samples;

        int pos;

    } *in;

} AMergeContext;

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

#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

static const AVOption amerge_options[] = {

    { "inputs", "specify the number of inputs", OFFSET(nb_inputs),

      AV_OPT_TYPE_INT, { .i64 = 2 }, 2, SWR_CH_MAX, FLAGS },

    { NULL }

};

AVFILTER_DEFINE_CLASS(amerge);

static av_cold void uninit(AVFilterContext *ctx)

{

    AMergeContext *am = ctx->priv;

    int i;

    for (i = 0; i < am->nb_inputs; i++) {

        if (am->in)

            ff_bufqueue_discard_all(&am->in[i].queue);

        if (ctx->input_pads)

            av_freep(&ctx->input_pads[i].name);

    }

    av_freep(&am->in);

}

static int query_formats(AVFilterContext *ctx)

{

    AMergeContext *am = ctx->priv;

    int64_t inlayout[SWR_CH_MAX], outlayout = 0;

    AVFilterFormats *formats;

    AVFilterChannelLayouts *layouts;

    int i, overlap = 0, nb_ch = 0;

    for (i = 0; i < am->nb_inputs; i++) {

        if (!ctx->inputs[i]->in_channel_layouts ||

            !ctx->inputs[i]->in_channel_layouts->nb_channel_layouts) {

            av_log(ctx, AV_LOG_WARNING,

                   "No channel layout for input %d\n", i + 1);

            return AVERROR(EAGAIN);

        }

        inlayout[i] = ctx->inputs[i]->in_channel_layouts->channel_layouts[0];

        if (ctx->inputs[i]->in_channel_layouts->nb_channel_layouts > 1) {

            char buf[256];

            av_get_channel_layout_string(buf, sizeof(buf), 0, inlayout[i]);

            av_log(ctx, AV_LOG_INFO, "Using \"%s\" for input %d\n", buf, i + 1);

        }

        am->in[i].nb_ch = av_get_channel_layout_nb_channels(inlayout[i]);

        if (outlayout & inlayout[i])

            overlap++;

        outlayout |= inlayout[i];

        nb_ch += am->in[i].nb_ch;

    }

    if (nb_ch > SWR_CH_MAX) {

        av_log(ctx, AV_LOG_ERROR, "Too many channels (max %d)\n", SWR_CH_MAX);

        return AVERROR(EINVAL);

    }

    if (overlap) {

        av_log(ctx, AV_LOG_WARNING,

               "Input channel layouts overlap: "

               "output layout will be determined by the number of distinct input channels\n");

        for (i = 0; i < nb_ch; i++)

            am->route[i] = i;

        outlayout = av_get_default_channel_layout(nb_ch);

        if (!outlayout)

            outlayout = ((int64_t)1 << nb_ch) - 1;

    } else {

        int *route[SWR_CH_MAX];

        int c, out_ch_number = 0;

        route[0] = am->route;

        for (i = 1; i < am->nb_inputs; i++)

            route[i] = route[i - 1] + am->in[i - 1].nb_ch;

        for (c = 0; c < 64; c++)

            for (i = 0; i < am->nb_inputs; i++)

                if ((inlayout[i] >> c) & 1)

                    *(route[i]++) = out_ch_number++;

    }

    formats = ff_make_format_list(ff_packed_sample_fmts_array);

    ff_set_common_formats(ctx, formats);

    for (i = 0; i < am->nb_inputs; i++) {

        layouts = NULL;

        ff_add_channel_layout(&layouts, inlayout[i]);

        ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts);

    }

    layouts = NULL;

    ff_add_channel_layout(&layouts, outlayout);

    ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts);

    ff_set_common_samplerates(ctx, ff_all_samplerates());

    return 0;

}

static int config_output(AVFilterLink *outlink)

{

    AVFilterContext *ctx = outlink->src;

    AMergeContext *am = ctx->priv;

    AVBPrint bp;

    int i;

    for (i = 1; i < am->nb_inputs; i++) {

        if (ctx->inputs[i]->sample_rate != ctx->inputs[0]->sample_rate) {

            av_log(ctx, AV_LOG_ERROR,

                   "Inputs must have the same sample rate "

                   "%d for in%d vs %d\n",

                   ctx->inputs[i]->sample_rate, i, ctx->inputs[0]->sample_rate);

            return AVERROR(EINVAL);

        }

    }

    am->bps = av_get_bytes_per_sample(ctx->outputs[0]->format);

    outlink->sample_rate = ctx->inputs[0]->sample_rate;

    outlink->time_base   = ctx->inputs[0]->time_base;

    av_bprint_init(&bp, 0, 1);

    for (i = 0; i < am->nb_inputs; i++) {

        av_bprintf(&bp, "%sin%d:", i ? " + " : "", i);

        av_bprint_channel_layout(&bp, -1, ctx->inputs[i]->channel_layout);

    }

    av_bprintf(&bp, " -> out:");

    av_bprint_channel_layout(&bp, -1, ctx->outputs[0]->channel_layout);

    av_log(ctx, AV_LOG_VERBOSE, "%s\n", bp.str);

    return 0;

}

static int request_frame(AVFilterLink *outlink)

{

    AVFilterContext *ctx = outlink->src;

    AMergeContext *am = ctx->priv;

    int i, ret;

    for (i = 0; i < am->nb_inputs; i++)

        if (!am->in[i].nb_samples)

            if ((ret = ff_request_frame(ctx->inputs[i])) < 0)

                return ret;

    return 0;

}

/**

 * Copy samples from several input streams to one output stream.

 * @param nb_inputs number of inputs

 * @param in        inputs; used only for the nb_ch field;

 * @param route     routing values;

 *                  input channel i goes to output channel route[i];

 *                  i <  in[0].nb_ch are the channels from the first output;

 *                  i >= in[0].nb_ch are the channels from the second output

 * @param ins       pointer to the samples of each inputs, in packed format;

 *                  will be left at the end of the copied samples

 * @param outs      pointer to the samples of the output, in packet format;

 *                  must point to a buffer big enough;

 *                  will be left at the end of the copied samples

 * @param ns        number of samples to copy

 * @param bps       bytes per sample

 */

static inline void copy_samples(int nb_inputs, struct amerge_input in[],

                                int *route, uint8_t *ins[],

                                uint8_t **outs, int ns, int bps)

{

    int *route_cur;

    int i, c, nb_ch = 0;

    for (i = 0; i < nb_inputs; i++)

        nb_ch += in[i].nb_ch;

    while (ns--) {

        route_cur = route;

        for (i = 0; i < nb_inputs; i++) {

            for (c = 0; c < in[i].nb_ch; c++) {

                memcpy((*outs) + bps * *(route_cur++), ins[i], bps);

                ins[i] += bps;

            }

        }

        *outs += nb_ch * bps;

    }

}

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

{

    AVFilterContext *ctx = inlink->dst;

    AMergeContext *am = ctx->priv;

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

    int input_number;

    int nb_samples, ns, i;

    AVFrame *outbuf, *inbuf[SWR_CH_MAX];

    uint8_t *ins[SWR_CH_MAX], *outs;

    for (input_number = 0; input_number < am->nb_inputs; input_number++)

        if (inlink == ctx->inputs[input_number])

            break;

    av_assert1(input_number < am->nb_inputs);

    if (ff_bufqueue_is_full(&am->in[input_number].queue)) {

        av_frame_free(&insamples);

        return AVERROR(ENOMEM);

    }

    ff_bufqueue_add(ctx, &am->in[input_number].queue, av_frame_clone(insamples));

    am->in[input_number].nb_samples += insamples->nb_samples;

    av_frame_free(&insamples);

    nb_samples = am->in[0].nb_samples;

    for (i = 1; i < am->nb_inputs; i++)

        nb_samples = FFMIN(nb_samples, am->in[i].nb_samples);

    if (!nb_samples)

        return 0;

    outbuf = ff_get_audio_buffer(ctx->outputs[0], nb_samples);

    if (!outbuf)

        return AVERROR(ENOMEM);

    outs = outbuf->data[0];

    for (i = 0; i < am->nb_inputs; i++) {

        inbuf[i] = ff_bufqueue_peek(&am->in[i].queue, 0);

        ins[i] = inbuf[i]->data[0] +

                 am->in[i].pos * am->in[i].nb_ch * am->bps;

    }

    av_frame_copy_props(outbuf, inbuf[0]);

    outbuf->pts = inbuf[0]->pts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE :

                  inbuf[0]->pts +

                  av_rescale_q(am->in[0].pos,

                               (AVRational){ 1, ctx->inputs[0]->sample_rate },

                               ctx->outputs[0]->time_base);

    outbuf->nb_samples     = nb_samples;

    outbuf->channel_layout = outlink->channel_layout;

    av_frame_set_channels(outbuf, outlink->channels);

    while (nb_samples) {

        ns = nb_samples;

        for (i = 0; i < am->nb_inputs; i++)

            ns = FFMIN(ns, inbuf[i]->nb_samples - am->in[i].pos);

        /* Unroll the most common sample formats: speed +~350% for the loop,

           +~13% overall (including two common decoders) */

        switch (am->bps) {

            case 1:

                copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 1);

                break;

            case 2:

                copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 2);

                break;

            case 4:

                copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, 4);

                break;

            default:

                copy_samples(am->nb_inputs, am->in, am->route, ins, &outs, ns, am->bps);

                break;

        }

        nb_samples -= ns;

        for (i = 0; i < am->nb_inputs; i++) {

            am->in[i].nb_samples -= ns;

            am->in[i].pos += ns;

            if (am->in[i].pos == inbuf[i]->nb_samples) {

                am->in[i].pos = 0;

                av_frame_free(&inbuf[i]);

                ff_bufqueue_get(&am->in[i].queue);

                inbuf[i] = ff_bufqueue_peek(&am->in[i].queue, 0);

                ins[i] = inbuf[i] ? inbuf[i]->data[0] : NULL;

            }

        }

    }

    return ff_filter_frame(ctx->outputs[0], outbuf);

}

static av_cold int init(AVFilterContext *ctx)

{

    AMergeContext *am = ctx->priv;

    int i;

    am->in = av_calloc(am->nb_inputs, sizeof(*am->in));

    if (!am->in)

        return AVERROR(ENOMEM);

    for (i = 0; i < am->nb_inputs; i++) {

        char *name = av_asprintf("in%d", i);

        AVFilterPad pad = {

            .name             = name,

            .type             = AVMEDIA_TYPE_AUDIO,

            .filter_frame     = filter_frame,

        };

        if (!name)

            return AVERROR(ENOMEM);

        ff_insert_inpad(ctx, i, &pad);

    }

    return 0;

}

static const AVFilterPad amerge_outputs[] = {

    {

        .name          = "default",

        .type          = AVMEDIA_TYPE_AUDIO,

        .config_props  = config_output,

        .request_frame = request_frame,

    },

    { NULL }

};

AVFilter avfilter_af_amerge = {

    .name          = "amerge",

    .description   = NULL_IF_CONFIG_SMALL("Merge two or more audio streams into "

                                          "a single multi-channel stream."),

    .priv_size     = sizeof(AMergeContext),

    .init          = init,

    .uninit        = uninit,

    .query_formats = query_formats,

    .inputs        = NULL,

    .outputs       = amerge_outputs,

    .priv_class    = &amerge_class,

    .flags         = AVFILTER_FLAG_DYNAMIC_INPUTS,

};