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- /*
- * 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 <libavformat/avformat.h>
- #include <libavutil/opt.h>
- #include <unistd.h>
- 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 occurred: %s\n", av_err2str(ret));
- return 1;
- }
- return 0;
- }
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