mirror of https://github.com/FFmpeg/FFmpeg.git
When ffmpeg was streaming, multiple clients were only supported by using a multicast destination address. An alternative was to stream to a server which re-distributes the content. This commit adds ZeroMQ as a protocol, which allows multiple clients to connect to a single ffmpeg instance. Signed-off-by: Marton Balint <cus@passwd.hu>pull/321/head^2
Andriy Gelman
6 years ago
committed by
Marton Balint
parent
b022d9ba28
commit
ef43a4d6b3
8 changed files with 254 additions and 2 deletions
@ -0,0 +1,199 @@ |
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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 = 32768 }, -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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zmq_ctx_term(s->context); |
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return AVERROR_EXTERNAL; |
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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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zmq_close(s->socket); |
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zmq_ctx_term(s->context); |
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return AVERROR_EXTERNAL; |
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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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zmq_ctx_term(s->context); |
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return AVERROR_EXTERNAL; |
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} |
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zmq_setsockopt(s->socket, ZMQ_SUBSCRIBE, "", 0); |
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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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zmq_close(s->socket); |
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zmq_ctx_term(s->context); |
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return AVERROR_EXTERNAL; |
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} |
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} |
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return 0; |
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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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