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