early-access version 1432
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pineappleEA
204
externals/ffmpeg/libavformat/libzmq.c
vendored
Executable file
204
externals/ffmpeg/libavformat/libzmq.c
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Executable file
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/*
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* ZeroMQ Protocol
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* Copyright (c) 2019 Andriy Gelman
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <zmq.h>
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#include "url.h"
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#include "network.h"
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "libavutil/time.h"
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#define ZMQ_STRERROR zmq_strerror(zmq_errno())
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typedef struct ZMQContext {
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const AVClass *class;
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void *context;
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void *socket;
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int pkt_size;
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int pkt_size_overflow; /*keep track of the largest packet during overflow*/
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} ZMQContext;
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#define OFFSET(x) offsetof(ZMQContext, x)
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#define D AV_OPT_FLAG_DECODING_PARAM
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#define E AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "pkt_size", "Maximum send/read packet size", OFFSET(pkt_size), AV_OPT_TYPE_INT, { .i64 = 131072 }, -1, INT_MAX, .flags = D | E },
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{ NULL }
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};
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static int zmq_proto_wait(URLContext *h, void *socket, int write)
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{
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int ret;
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int ev = write ? ZMQ_POLLOUT : ZMQ_POLLIN;
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zmq_pollitem_t items = { .socket = socket, .fd = 0, .events = ev, .revents = 0 };
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ret = zmq_poll(&items, 1, POLLING_TIME);
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if (ret == -1) {
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av_log(h, AV_LOG_ERROR, "Error occured during zmq_poll(): %s\n", ZMQ_STRERROR);
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return AVERROR_EXTERNAL;
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}
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return items.revents & ev ? 0 : AVERROR(EAGAIN);
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}
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static int zmq_proto_wait_timeout(URLContext *h, void *socket, int write, int64_t timeout, AVIOInterruptCB *int_cb)
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{
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int ret;
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int64_t wait_start = 0;
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while (1) {
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if (ff_check_interrupt(int_cb))
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return AVERROR_EXIT;
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ret = zmq_proto_wait(h, socket, write);
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if (ret != AVERROR(EAGAIN))
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return ret;
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if (timeout > 0) {
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if (!wait_start)
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wait_start = av_gettime_relative();
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else if (av_gettime_relative() - wait_start > timeout)
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return AVERROR(ETIMEDOUT);
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}
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}
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}
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static int zmq_proto_open(URLContext *h, const char *uri, int flags)
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{
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int ret;
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ZMQContext *s = h->priv_data;
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s->pkt_size_overflow = 0;
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h->is_streamed = 1;
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if (s->pkt_size > 0)
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h->max_packet_size = s->pkt_size;
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s->context = zmq_ctx_new();
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if (!s->context) {
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/*errno not set on failure during zmq_ctx_new()*/
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av_log(h, AV_LOG_ERROR, "Error occured during zmq_ctx_new()\n");
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return AVERROR_EXTERNAL;
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}
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av_strstart(uri, "zmq:", &uri);
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/*publish during write*/
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if (h->flags & AVIO_FLAG_WRITE) {
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s->socket = zmq_socket(s->context, ZMQ_PUB);
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if (!s->socket) {
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av_log(h, AV_LOG_ERROR, "Error occured during zmq_socket(): %s\n", ZMQ_STRERROR);
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goto fail_term;
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}
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ret = zmq_bind(s->socket, uri);
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if (ret == -1) {
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av_log(h, AV_LOG_ERROR, "Error occured during zmq_bind(): %s\n", ZMQ_STRERROR);
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goto fail_close;
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}
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}
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/*subscribe for read*/
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if (h->flags & AVIO_FLAG_READ) {
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s->socket = zmq_socket(s->context, ZMQ_SUB);
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if (!s->socket) {
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av_log(h, AV_LOG_ERROR, "Error occured during zmq_socket(): %s\n", ZMQ_STRERROR);
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goto fail_term;
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}
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ret = zmq_setsockopt(s->socket, ZMQ_SUBSCRIBE, "", 0);
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if (ret == -1) {
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av_log(h, AV_LOG_ERROR, "Error occured during zmq_setsockopt(): %s\n", ZMQ_STRERROR);
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goto fail_close;
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}
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ret = zmq_connect(s->socket, uri);
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if (ret == -1) {
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av_log(h, AV_LOG_ERROR, "Error occured during zmq_connect(): %s\n", ZMQ_STRERROR);
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goto fail_close;
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}
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}
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return 0;
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fail_close:
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zmq_close(s->socket);
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fail_term:
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zmq_ctx_term(s->context);
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return AVERROR_EXTERNAL;
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}
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static int zmq_proto_write(URLContext *h, const unsigned char *buf, int size)
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{
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int ret;
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ZMQContext *s = h->priv_data;
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ret = zmq_proto_wait_timeout(h, s->socket, 1, h->rw_timeout, &h->interrupt_callback);
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if (ret)
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return ret;
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ret = zmq_send(s->socket, buf, size, 0);
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if (ret == -1) {
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av_log(h, AV_LOG_ERROR, "Error occured during zmq_send(): %s\n", ZMQ_STRERROR);
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return AVERROR_EXTERNAL;
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}
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return ret; /*number of bytes sent*/
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}
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static int zmq_proto_read(URLContext *h, unsigned char *buf, int size)
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{
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int ret;
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ZMQContext *s = h->priv_data;
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ret = zmq_proto_wait_timeout(h, s->socket, 0, h->rw_timeout, &h->interrupt_callback);
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if (ret)
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return ret;
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ret = zmq_recv(s->socket, buf, size, 0);
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if (ret == -1) {
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av_log(h, AV_LOG_ERROR, "Error occured during zmq_recv(): %s\n", ZMQ_STRERROR);
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return AVERROR_EXTERNAL;
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}
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if (ret > size) {
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s->pkt_size_overflow = FFMAX(s->pkt_size_overflow, ret);
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av_log(h, AV_LOG_WARNING, "Message exceeds available space in the buffer. Message will be truncated. Setting -pkt_size %d may resolve the issue.\n", s->pkt_size_overflow);
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ret = size;
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}
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return ret; /*number of bytes read*/
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}
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static int zmq_proto_close(URLContext *h)
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{
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ZMQContext *s = h->priv_data;
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zmq_close(s->socket);
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zmq_ctx_term(s->context);
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return 0;
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}
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static const AVClass zmq_context_class = {
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.class_name = "zmq",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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const URLProtocol ff_libzmq_protocol = {
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.name = "zmq",
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.url_close = zmq_proto_close,
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.url_open = zmq_proto_open,
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.url_read = zmq_proto_read,
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.url_write = zmq_proto_write,
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.priv_data_size = sizeof(ZMQContext),
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.priv_data_class = &zmq_context_class,
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.flags = URL_PROTOCOL_FLAG_NETWORK,
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};
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