/*
* 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 <zmq.h>
#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