From 25410c524ddee98c579c7a9ddaf0535278a6dae0 Mon Sep 17 00:00:00 2001 From: Stephan Holljes Date: Sat, 25 Jul 2015 02:07:15 +0200 Subject: doc/example: Add http multi-client example code Signed-off-by: Stephan Holljes --- doc/examples/http_multiclient.c | 155 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 155 insertions(+) create mode 100644 doc/examples/http_multiclient.c (limited to 'doc/examples/http_multiclient.c') diff --git a/doc/examples/http_multiclient.c b/doc/examples/http_multiclient.c new file mode 100644 index 0000000000..d42fce5c80 --- /dev/null +++ b/doc/examples/http_multiclient.c @@ -0,0 +1,155 @@ +/* + * Copyright (c) 2015 Stephan Holljes + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +/** + * @file + * libavformat multi-client network API usage example. + * + * @example http_multiclient.c + * This example will serve a file without decoding or demuxing it over http. + * Multiple clients can connect and will receive the same file. + */ + +#include +#include +#include + +void process_client(AVIOContext *client, const char *in_uri) +{ + AVIOContext *input = NULL; + uint8_t buf[1024]; + int ret, n, reply_code; + char *resource = NULL; + while ((ret = avio_handshake(client)) > 0) { + av_opt_get(client, "resource", AV_OPT_SEARCH_CHILDREN, &resource); + // check for strlen(resource) is necessary, because av_opt_get() + // may return empty string. + if (resource && strlen(resource)) + break; + } + if (ret < 0) + goto end; + av_log(client, AV_LOG_TRACE, "resource=%p\n", resource); + if (resource && resource[0] == '/' && !strcmp((resource + 1), in_uri)) { + reply_code = 200; + } else { + reply_code = AVERROR_HTTP_NOT_FOUND; + } + if ((ret = av_opt_set_int(client, "reply_code", reply_code, AV_OPT_SEARCH_CHILDREN)) < 0) { + av_log(client, AV_LOG_ERROR, "Failed to set reply_code: %s.\n", av_err2str(ret)); + goto end; + } + av_log(client, AV_LOG_TRACE, "Set reply code to %d\n", reply_code); + + while ((ret = avio_handshake(client)) > 0); + + if (ret < 0) + goto end; + + fprintf(stderr, "Handshake performed.\n"); + if (reply_code != 200) + goto end; + fprintf(stderr, "Opening input file.\n"); + if ((ret = avio_open2(&input, in_uri, AVIO_FLAG_READ, NULL, NULL)) < 0) { + av_log(input, AV_LOG_ERROR, "Failed to open input: %s: %s.\n", in_uri, + av_err2str(ret)); + goto end; + } + for(;;) { + n = avio_read(input, buf, sizeof(buf)); + if (n < 0) { + if (n == AVERROR_EOF) + break; + av_log(input, AV_LOG_ERROR, "Error reading from input: %s.\n", + av_err2str(n)); + break; + } + avio_write(client, buf, n); + avio_flush(client); + } +end: + fprintf(stderr, "Flushing client\n"); + avio_flush(client); + fprintf(stderr, "Closing client\n"); + avio_close(client); + fprintf(stderr, "Closing input\n"); + avio_close(input); +} + +int main(int argc, char **argv) +{ + av_log_set_level(AV_LOG_TRACE); + AVDictionary *options = NULL; + AVIOContext *client = NULL, *server = NULL; + const char *in_uri, *out_uri; + int ret, pid; + if (argc < 3) { + printf("usage: %s input http://hostname[:port]\n" + "API example program to serve http to multiple clients.\n" + "\n", argv[0]); + return 1; + } + + in_uri = argv[1]; + out_uri = argv[2]; + + av_register_all(); + avformat_network_init(); + + if ((ret = av_dict_set(&options, "listen", "2", 0)) < 0) { + fprintf(stderr, "Failed to set listen mode for server: %s\n", av_err2str(ret)); + return ret; + } + if ((ret = avio_open2(&server, out_uri, AVIO_FLAG_WRITE, NULL, &options)) < 0) { + fprintf(stderr, "Failed to open server: %s\n", av_err2str(ret)); + return ret; + } + fprintf(stderr, "Entering main loop.\n"); + for(;;) { + if ((ret = avio_accept(server, &client)) < 0) + goto end; + fprintf(stderr, "Accepted client, forking process.\n"); + // XXX: Since we don't reap our children and don't ignore signals + // this produces zombie processes. + pid = fork(); + if (pid < 0) { + perror("Fork failed"); + ret = AVERROR(errno); + goto end; + } + if (pid == 0) { + fprintf(stderr, "In child.\n"); + process_client(client, in_uri); + avio_close(server); + exit(0); + } + if (pid > 0) + avio_close(client); + } +end: + avio_close(server); + if (ret < 0 && ret != AVERROR_EOF) { + fprintf(stderr, "Some errors occured: %s\n", av_err2str(ret)); + return 1; + } + return 0; +} -- cgit v1.2.3