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/*

 * 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 join filter

 *

 * Join multiple audio inputs as different channels in

 * a single output

 */

#include "libavutil/avassert.h"

#include "libavutil/channel_layout.h"

#include "libavutil/common.h"

#include "libavutil/opt.h"

#include "audio.h"

#include "avfilter.h"

#include "formats.h"

#include "internal.h"

typedef struct ChannelMap {

    int input;                ///< input stream index

    int       in_channel_idx; ///< index of in_channel in the input stream data

    uint64_t  in_channel;     ///< layout describing the input channel

    uint64_t out_channel;     ///< layout describing the output channel

} ChannelMap;

typedef struct JoinContext {

    const AVClass *class;

    int inputs;

    char *map;

    char    *channel_layout_str;

    uint64_t channel_layout;

    int      nb_channels;

    ChannelMap *channels;

    /**

     * Temporary storage for input frames, until we get one on each input.

     */

    AVFrame **input_frames;

    /**

     *  Temporary storage for buffer references, for assembling the output frame.

     */

    AVBufferRef **buffers;

} JoinContext;

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

#define A AV_OPT_FLAG_AUDIO_PARAM

#define F AV_OPT_FLAG_FILTERING_PARAM

static const AVOption join_options[] = {

    { "inputs",         "Number of input streams.", OFFSET(inputs),             AV_OPT_TYPE_INT,    { .i64 = 2 }, 1, INT_MAX,       A|F },

    { "channel_layout", "Channel layout of the "

                        "output stream.",           OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, {.str = "stereo"}, 0, 0, A|F },

    { "map",            "A comma-separated list of channels maps in the format "

                        "'input_stream.input_channel-output_channel.",

                                                    OFFSET(map),                AV_OPT_TYPE_STRING,                 .flags = A|F },

    { NULL }

};

AVFILTER_DEFINE_CLASS(join);

static int filter_frame(AVFilterLink *link, AVFrame *frame)

{

    AVFilterContext *ctx = link->dst;

    JoinContext       *s = ctx->priv;

    int i;

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

        if (link == ctx->inputs[i])

            break;

    av_assert0(i < ctx->nb_inputs);

    av_assert0(!s->input_frames[i]);

    s->input_frames[i] = frame;

    return 0;

}

static int parse_maps(AVFilterContext *ctx)

{

    JoinContext *s = ctx->priv;

    char separator = '|';

    char *cur      = s->map;

#if FF_API_OLD_FILTER_OPTS

    if (cur && strchr(cur, ',')) {

        av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use '|' to "

               "separate the mappings.\n");

        separator = ',';

    }

#endif

    while (cur && *cur) {

        char *sep, *next, *p;

        uint64_t in_channel = 0, out_channel = 0;

        int input_idx, out_ch_idx, in_ch_idx;

        next = strchr(cur, separator);

        if (next)

            *next++ = 0;

        /* split the map into input and output parts */

        if (!(sep = strchr(cur, '-'))) {

            av_log(ctx, AV_LOG_ERROR, "Missing separator '-' in channel "

                   "map '%s'\n", cur);

            return AVERROR(EINVAL);

        }

        *sep++ = 0;

#define PARSE_CHANNEL(str, var, inout)                                         \

        if (!(var = av_get_channel_layout(str))) {                             \

            av_log(ctx, AV_LOG_ERROR, "Invalid " inout " channel: %s.\n", str);\

            return AVERROR(EINVAL);                                            \

        }                                                                      \

        if (av_get_channel_layout_nb_channels(var) != 1) {                     \

            av_log(ctx, AV_LOG_ERROR, "Channel map describes more than one "   \

                   inout " channel.\n");                                       \

            return AVERROR(EINVAL);                                            \

        }

        /* parse output channel */

        PARSE_CHANNEL(sep, out_channel, "output");

        if (!(out_channel & s->channel_layout)) {

            av_log(ctx, AV_LOG_ERROR, "Output channel '%s' is not present in "

                   "requested channel layout.\n", sep);

            return AVERROR(EINVAL);

        }

        out_ch_idx = av_get_channel_layout_channel_index(s->channel_layout,

                                                         out_channel);

        if (s->channels[out_ch_idx].input >= 0) {

            av_log(ctx, AV_LOG_ERROR, "Multiple maps for output channel "

                   "'%s'.\n", sep);

            return AVERROR(EINVAL);

        }

        /* parse input channel */

        input_idx = strtol(cur, &cur, 0);

        if (input_idx < 0 || input_idx >= s->inputs) {

            av_log(ctx, AV_LOG_ERROR, "Invalid input stream index: %d.\n",

                   input_idx);

            return AVERROR(EINVAL);

        }

        if (*cur)

            cur++;

        in_ch_idx = strtol(cur, &p, 0);

        if (p == cur) {

            /* channel specifier is not a number,

             * try to parse as channel name */

            PARSE_CHANNEL(cur, in_channel, "input");

        }

        s->channels[out_ch_idx].input      = input_idx;

        if (in_channel)

            s->channels[out_ch_idx].in_channel = in_channel;

        else

            s->channels[out_ch_idx].in_channel_idx = in_ch_idx;

        cur = next;

    }

    return 0;

}

static av_cold int join_init(AVFilterContext *ctx)

{

    JoinContext *s = ctx->priv;

    int ret, i;

    if (!(s->channel_layout = av_get_channel_layout(s->channel_layout_str))) {

        av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout '%s'.\n",

               s->channel_layout_str);

        return AVERROR(EINVAL);

    }

    s->nb_channels  = av_get_channel_layout_nb_channels(s->channel_layout);

    s->channels     = av_mallocz(sizeof(*s->channels) * s->nb_channels);

    s->buffers      = av_mallocz(sizeof(*s->buffers)  * s->nb_channels);

    s->input_frames = av_mallocz(sizeof(*s->input_frames) * s->inputs);

    if (!s->channels || !s->buffers|| !s->input_frames)

        return AVERROR(ENOMEM);

    for (i = 0; i < s->nb_channels; i++) {

        s->channels[i].out_channel = av_channel_layout_extract_channel(s->channel_layout, i);

        s->channels[i].input       = -1;

    }

    if ((ret = parse_maps(ctx)) < 0)

        return ret;

    for (i = 0; i < s->inputs; i++) {

        char name[32];

        AVFilterPad pad = { 0 };

        snprintf(name, sizeof(name), "input%d", i);

        pad.type           = AVMEDIA_TYPE_AUDIO;

        pad.name           = av_strdup(name);

        pad.filter_frame   = filter_frame;

        pad.needs_fifo = 1;

        ff_insert_inpad(ctx, i, &pad);

    }

    return 0;

}

static av_cold void join_uninit(AVFilterContext *ctx)

{

    JoinContext *s = ctx->priv;

    int i;

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

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

        av_frame_free(&s->input_frames[i]);

    }

    av_freep(&s->channels);

    av_freep(&s->buffers);

    av_freep(&s->input_frames);

}

static int join_query_formats(AVFilterContext *ctx)

{

    JoinContext *s = ctx->priv;

    AVFilterChannelLayouts *layouts = NULL;

    int i;

    ff_add_channel_layout(&layouts, s->channel_layout);

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

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

        ff_channel_layouts_ref(ff_all_channel_layouts(),

                               &ctx->inputs[i]->out_channel_layouts);

    ff_set_common_formats    (ctx, ff_planar_sample_fmts());

    ff_set_common_samplerates(ctx, ff_all_samplerates());

    return 0;

}

static void guess_map_matching(AVFilterContext *ctx, ChannelMap *ch,

                               uint64_t *inputs)

{

    int i;

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

        AVFilterLink *link = ctx->inputs[i];

        if (ch->out_channel & link->channel_layout &&

            !(ch->out_channel & inputs[i])) {

            ch->input      = i;

            ch->in_channel = ch->out_channel;

            inputs[i]     |= ch->out_channel;

            return;

        }

    }

}

static void guess_map_any(AVFilterContext *ctx, ChannelMap *ch,

                          uint64_t *inputs)

{

    int i;

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

        AVFilterLink *link = ctx->inputs[i];

        if ((inputs[i] & link->channel_layout) != link->channel_layout) {

            uint64_t unused = link->channel_layout & ~inputs[i];

            ch->input      = i;

            ch->in_channel = av_channel_layout_extract_channel(unused, 0);

            inputs[i]     |= ch->in_channel;

            return;

        }

    }

}

static int join_config_output(AVFilterLink *outlink)

{

    AVFilterContext *ctx = outlink->src;

    JoinContext       *s = ctx->priv;

    uint64_t *inputs;   // nth element tracks which channels are used from nth input

    int i, ret = 0;

    /* initialize inputs to user-specified mappings */

    if (!(inputs = av_mallocz(sizeof(*inputs) * ctx->nb_inputs)))

        return AVERROR(ENOMEM);

    for (i = 0; i < s->nb_channels; i++) {

        ChannelMap *ch = &s->channels[i];

        AVFilterLink *inlink;

        if (ch->input < 0)

            continue;

        inlink = ctx->inputs[ch->input];

        if (!ch->in_channel)

            ch->in_channel = av_channel_layout_extract_channel(inlink->channel_layout,

                                                               ch->in_channel_idx);

        if (!(ch->in_channel & inlink->channel_layout)) {

            av_log(ctx, AV_LOG_ERROR, "Requested channel %s is not present in "

                   "input stream #%d.\n", av_get_channel_name(ch->in_channel),

                   ch->input);

            ret = AVERROR(EINVAL);

            goto fail;

        }

        inputs[ch->input] |= ch->in_channel;

    }

    /* guess channel maps when not explicitly defined */

    /* first try unused matching channels */

    for (i = 0; i < s->nb_channels; i++) {

        ChannelMap *ch = &s->channels[i];

        if (ch->input < 0)

            guess_map_matching(ctx, ch, inputs);

    }

    /* if the above failed, try to find _any_ unused input channel */

    for (i = 0; i < s->nb_channels; i++) {

        ChannelMap *ch = &s->channels[i];

        if (ch->input < 0)

            guess_map_any(ctx, ch, inputs);

        if (ch->input < 0) {

            av_log(ctx, AV_LOG_ERROR, "Could not find input channel for "

                   "output channel '%s'.\n",

                   av_get_channel_name(ch->out_channel));

            goto fail;

        }

        ch->in_channel_idx = av_get_channel_layout_channel_index(ctx->inputs[ch->input]->channel_layout,

                                                                 ch->in_channel);

    }

    /* print mappings */

    av_log(ctx, AV_LOG_VERBOSE, "mappings: ");

    for (i = 0; i < s->nb_channels; i++) {

        ChannelMap *ch = &s->channels[i];

        av_log(ctx, AV_LOG_VERBOSE, "%d.%s => %s ", ch->input,

               av_get_channel_name(ch->in_channel),

               av_get_channel_name(ch->out_channel));

    }

    av_log(ctx, AV_LOG_VERBOSE, "\n");

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

        if (!inputs[i])

            av_log(ctx, AV_LOG_WARNING, "No channels are used from input "

                   "stream %d.\n", i);

    }

fail:

    av_freep(&inputs);

    return ret;

}

static int join_request_frame(AVFilterLink *outlink)

{

    AVFilterContext *ctx = outlink->src;

    JoinContext *s       = ctx->priv;

    AVFrame *frame;

    int linesize   = INT_MAX;

    int nb_samples = 0;

    int nb_buffers = 0;

    int i, j, ret;

    /* get a frame on each input */

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

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

        if (!s->input_frames[i] &&

            (ret = ff_request_frame(inlink)) < 0)

            return ret;

        /* request the same number of samples on all inputs */

        if (i == 0) {

            nb_samples = s->input_frames[0]->nb_samples;

            for (j = 1; !i && j < ctx->nb_inputs; j++)

                ctx->inputs[j]->request_samples = nb_samples;

        }

    }

    /* setup the output frame */

    frame = av_frame_alloc();

    if (!frame)

        return AVERROR(ENOMEM);

    if (s->nb_channels > FF_ARRAY_ELEMS(frame->data)) {

        frame->extended_data = av_mallocz(s->nb_channels *

                                          sizeof(*frame->extended_data));

        if (!frame->extended_data) {

            ret = AVERROR(ENOMEM);

            goto fail;

        }

    }

    /* copy the data pointers */

    for (i = 0; i < s->nb_channels; i++) {

        ChannelMap *ch = &s->channels[i];

        AVFrame *cur   = s->input_frames[ch->input];

        AVBufferRef *buf;

        frame->extended_data[i] = cur->extended_data[ch->in_channel_idx];

        linesize = FFMIN(linesize, cur->linesize[0]);

        /* add the buffer where this plan is stored to the list if it's

         * not already there */

        buf = av_frame_get_plane_buffer(cur, ch->in_channel_idx);

        if (!buf) {

            ret = AVERROR(EINVAL);

            goto fail;

        }

        for (j = 0; j < nb_buffers; j++)

            if (s->buffers[j]->buffer == buf->buffer)

                break;

        if (j == i)

            s->buffers[nb_buffers++] = buf;

    }

    /* create references to the buffers we copied to output */

    if (nb_buffers > FF_ARRAY_ELEMS(frame->buf)) {

        frame->nb_extended_buf = nb_buffers - FF_ARRAY_ELEMS(frame->buf);

        frame->extended_buf = av_mallocz(sizeof(*frame->extended_buf) *

                                         frame->nb_extended_buf);

        if (!frame->extended_buf) {

            frame->nb_extended_buf = 0;

            ret = AVERROR(ENOMEM);

            goto fail;

        }

    }

    for (i = 0; i < FFMIN(FF_ARRAY_ELEMS(frame->buf), nb_buffers); i++) {

        frame->buf[i] = av_buffer_ref(s->buffers[i]);

        if (!frame->buf[i]) {

            ret = AVERROR(ENOMEM);

            goto fail;

        }

    }

    for (i = 0; i < frame->nb_extended_buf; i++) {

        frame->extended_buf[i] = av_buffer_ref(s->buffers[i +

                                               FF_ARRAY_ELEMS(frame->buf)]);

        if (!frame->extended_buf[i]) {

            ret = AVERROR(ENOMEM);

            goto fail;

        }

    }

    frame->nb_samples     = nb_samples;

    frame->channel_layout = outlink->channel_layout;

    av_frame_set_channels(frame, outlink->channels);

    frame->format         = outlink->format;

    frame->sample_rate    = outlink->sample_rate;

    frame->pts            = s->input_frames[0]->pts;

    frame->linesize[0]    = linesize;

    if (frame->data != frame->extended_data) {

        memcpy(frame->data, frame->extended_data, sizeof(*frame->data) *

               FFMIN(FF_ARRAY_ELEMS(frame->data), s->nb_channels));

    }

    ret = ff_filter_frame(outlink, frame);

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

        av_frame_free(&s->input_frames[i]);

    return ret;

fail:

    av_frame_free(&frame);

    return ret;

}

static const AVFilterPad avfilter_af_join_outputs[] = {

    {

        .name          = "default",

        .type          = AVMEDIA_TYPE_AUDIO,

        .config_props  = join_config_output,

        .request_frame = join_request_frame,

    },

    { NULL }

};

AVFilter avfilter_af_join = {

    .name           = "join",

    .description    = NULL_IF_CONFIG_SMALL("Join multiple audio streams into "

                                           "multi-channel output."),

    .priv_size      = sizeof(JoinContext),

    .priv_class     = &join_class,

    .init           = join_init,

    .uninit         = join_uninit,

    .query_formats  = join_query_formats,

    .inputs         = NULL,

    .outputs        = avfilter_af_join_outputs,

    .flags          = AVFILTER_FLAG_DYNAMIC_INPUTS,

};