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/*

 * Copyright (c) 2013 Stefano Sabatini

 *

 * 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

 * receive commands through libzeromq and broker them to filters

 */

#include 

#include "libavutil/avstring.h"

#include "libavutil/bprint.h"

#include "libavutil/opt.h"

#include "avfilter.h"

#include "internal.h"

#include "avfiltergraph.h"

#include "audio.h"

#include "video.h"

typedef struct {

    const AVClass *class;

    void *zmq;

    void *responder;

    char *bind_address;

    int command_count;

} ZMQContext;

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

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM

static const AVOption options[] = {

    { "bind_address", "set bind address", OFFSET(bind_address), AV_OPT_TYPE_STRING, {.str = "tcp://*:5555"}, 0, 0, FLAGS },

    { "b",            "set bind address", OFFSET(bind_address), AV_OPT_TYPE_STRING, {.str = "tcp://*:5555"}, 0, 0, FLAGS },

    { NULL }

};

static av_cold int init(AVFilterContext *ctx)

{

    ZMQContext *zmq = ctx->priv;

    zmq->zmq = zmq_ctx_new();

    if (!zmq->zmq) {

        av_log(ctx, AV_LOG_ERROR,

               "Could not create ZMQ context: %s\n", zmq_strerror(errno));

        return AVERROR_EXTERNAL;

    }

    zmq->responder = zmq_socket(zmq->zmq, ZMQ_REP);

    if (!zmq->responder) {

        av_log(ctx, AV_LOG_ERROR,

               "Could not create ZMQ socket: %s\n", zmq_strerror(errno));

        return AVERROR_EXTERNAL;

    }

    if (zmq_bind(zmq->responder, zmq->bind_address) == -1) {

        av_log(ctx, AV_LOG_ERROR,

               "Could not bind ZMQ socket to address '%s': %s\n",

               zmq->bind_address, zmq_strerror(errno));

        return AVERROR_EXTERNAL;

    }

    zmq->command_count = -1;

    return 0;

}

static void av_cold uninit(AVFilterContext *ctx)

{

    ZMQContext *zmq = ctx->priv;

    zmq_close(zmq->responder);

    zmq_ctx_destroy(zmq->zmq);

}

typedef struct {

    char *target, *command, *arg;

} Command;

#define SPACES " \f\t\n\r"

static int parse_command(Command *cmd, const char *command_str, void *log_ctx)

{

    const char **buf = &command_str;

    cmd->target = av_get_token(buf, SPACES);

    if (!cmd->target || !cmd->target[0]) {

        av_log(log_ctx, AV_LOG_ERROR,

               "No target specified in command '%s'\n", command_str);

        return AVERROR(EINVAL);

    }

    cmd->command = av_get_token(buf, SPACES);

    if (!cmd->command || !cmd->command[0]) {

        av_log(log_ctx, AV_LOG_ERROR,

               "No command specified in command '%s'\n", command_str);

        return AVERROR(EINVAL);

    }

    cmd->arg = av_get_token(buf, SPACES);

    return 0;

}

static int recv_msg(AVFilterContext *ctx, char **buf, int *buf_size)

{

    ZMQContext *zmq = ctx->priv;

    zmq_msg_t msg;

    int ret = 0;

    if (zmq_msg_init(&msg) == -1) {

        av_log(ctx, AV_LOG_WARNING,

               "Could not initialize receive message: %s\n", zmq_strerror(errno));

        return AVERROR_EXTERNAL;

    }

    if (zmq_msg_recv(&msg, zmq->responder, ZMQ_DONTWAIT) == -1) {

        if (errno != EAGAIN)

            av_log(ctx, AV_LOG_WARNING,

                   "Could not receive message: %s\n", zmq_strerror(errno));

        ret = AVERROR_EXTERNAL;

        goto end;

    }

    *buf_size = zmq_msg_size(&msg) + 1;

    *buf = av_malloc(*buf_size);

    if (!*buf) {

        ret = AVERROR(ENOMEM);

        goto end;

    }

    memcpy(*buf, zmq_msg_data(&msg), *buf_size);

    (*buf)[*buf_size-1] = 0;

end:

    zmq_msg_close(&msg);

    return ret;

}

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

{

    AVFilterContext *ctx = inlink->dst;

    ZMQContext *zmq = ctx->priv;

    while (1) {

        char cmd_buf[1024];

        char *recv_buf, *send_buf;

        int recv_buf_size;

        Command cmd = {0};

        int ret;

        /* receive command */

        if (recv_msg(ctx, &recv_buf, &recv_buf_size) < 0)

            break;

        zmq->command_count++;

        /* parse command */

        if (parse_command(&cmd, recv_buf, ctx) < 0) {

            av_log(ctx, AV_LOG_ERROR, "Could not parse command #%d\n", zmq->command_count);

            goto end;

        }

        /* process command */

        av_log(ctx, AV_LOG_VERBOSE,

               "Processing command #%d target:%s command:%s arg:%s\n",

               zmq->command_count, cmd.target, cmd.command, cmd.arg);

        ret = avfilter_graph_send_command(inlink->graph,

                                          cmd.target, cmd.command, cmd.arg,

                                          cmd_buf, sizeof(cmd_buf),

                                          AVFILTER_CMD_FLAG_ONE);

        send_buf = av_asprintf("%d %s%s%s",

                               -ret, av_err2str(ret), cmd_buf[0] ? "\n" : "", cmd_buf);

        if (!send_buf) {

            ret = AVERROR(ENOMEM);

            goto end;

        }

        av_log(ctx, AV_LOG_VERBOSE,

               "Sending command reply for command #%d:\n%s\n",

               zmq->command_count, send_buf);

        if (zmq_send(zmq->responder, send_buf, strlen(send_buf), 0) == -1)

            av_log(ctx, AV_LOG_ERROR, "Failed to send reply for command #%d: %s\n",

                   zmq->command_count, zmq_strerror(ret));

    end:

        av_freep(&send_buf);

        av_freep(&recv_buf);

        recv_buf_size = 0;

        av_freep(&cmd.target);

        av_freep(&cmd.command);

        av_freep(&cmd.arg);

    }

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

}

#if CONFIG_ZMQ_FILTER

#define zmq_options options

AVFILTER_DEFINE_CLASS(zmq);

static const AVFilterPad zmq_inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_VIDEO,

        .filter_frame = filter_frame,

    },

    { NULL }

};

static const AVFilterPad zmq_outputs[] = {

    {

        .name = "default",

        .type = AVMEDIA_TYPE_VIDEO,

    },

    { NULL }

};

AVFilter avfilter_vf_zmq = {

    .name        = "zmq",

    .description = NULL_IF_CONFIG_SMALL("Receive commands through ZMQ and broker them to filters."),

    .init        = init,

    .uninit      = uninit,

    .priv_size   = sizeof(ZMQContext),

    .inputs      = zmq_inputs,

    .outputs     = zmq_outputs,

    .priv_class  = &zmq_class,

};

#endif

#if CONFIG_AZMQ_FILTER

#define azmq_options options

AVFILTER_DEFINE_CLASS(azmq);

static const AVFilterPad azmq_inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_AUDIO,

        .filter_frame = filter_frame,

    },

    { NULL }

};

static const AVFilterPad azmq_outputs[] = {

    {

        .name = "default",

        .type = AVMEDIA_TYPE_AUDIO,

    },

    { NULL }

};

AVFilter avfilter_af_azmq = {

    .name        = "azmq",

    .description = NULL_IF_CONFIG_SMALL("Receive commands through ZMQ and broker them to filters."),

    .init        = init,

    .uninit      = uninit,

    .priv_size   = sizeof(ZMQContext),

    .inputs      = azmq_inputs,

    .outputs     = azmq_outputs,

    .priv_class  = &azmq_class,

};

#endif