/* * 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 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), .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 ff_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