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FFmpeg/libavfilter/f_zmq.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

255 lines
7.2 KiB
C

/*
* 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 "config_components.h"
#include <zmq.h>
#include "libavutil/avstring.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"
#include "audio.h"
#include "video.h"
typedef struct ZMQContext {
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 Command {
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 - 1);
(*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);
}
AVFILTER_DEFINE_CLASS_EXT(zmq, "(a)zmq", options);
#if CONFIG_ZMQ_FILTER
static const AVFilterPad zmq_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
const AVFilter ff_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),
FILTER_INPUTS(zmq_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
.priv_class = &zmq_class,
};
#endif
#if CONFIG_AZMQ_FILTER
static const AVFilterPad azmq_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
},
};
const AVFilter ff_af_azmq = {
.name = "azmq",
.description = NULL_IF_CONFIG_SMALL("Receive commands through ZMQ and broker them to filters."),
.priv_class = &zmq_class,
.init = init,
.uninit = uninit,
.priv_size = sizeof(ZMQContext),
FILTER_INPUTS(azmq_inputs),
FILTER_OUTPUTS(ff_audio_default_filterpad),
};
#endif