From 7ddb0ef9af50e07bf949b5fb691a3efad00fd972 Mon Sep 17 00:00:00 2001 From: Stefano Sabatini Date: Sun, 21 Apr 2013 15:00:11 +0200 Subject: lavfi: add zmq filters --- libavfilter/f_zmq.c | 276 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 276 insertions(+) create mode 100644 libavfilter/f_zmq.c (limited to 'libavfilter/f_zmq.c') diff --git a/libavfilter/f_zmq.c b/libavfilter/f_zmq.c new file mode 100644 index 0000000000..547e1a3798 --- /dev/null +++ b/libavfilter/f_zmq.c @@ -0,0 +1,276 @@ +/* + * 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, + .get_audio_buffer = ff_null_get_audio_buffer, + .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 -- cgit v1.2.3