Signed-off-by: Stephan Holljes <klaxa1...@googlemail.com> --- doc/examples/Makefile | 1 + doc/examples/http_multiclient.c | 139 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 140 insertions(+) create mode 100644 doc/examples/http_multiclient.c
Changes since last version: - Use handshake API properly - Use perror() to print fork()'s error message. diff --git a/doc/examples/Makefile b/doc/examples/Makefile index 9699f11..8c9501b 100644 --- a/doc/examples/Makefile +++ b/doc/examples/Makefile @@ -18,6 +18,7 @@ EXAMPLES= avio_list_dir \ extract_mvs \ filtering_video \ filtering_audio \ + http_multiclient \ metadata \ muxing \ remuxing \ diff --git a/doc/examples/http_multiclient.c b/doc/examples/http_multiclient.c new file mode 100644 index 0000000..a2293b8 --- /dev/null +++ b/doc/examples/http_multiclient.c @@ -0,0 +1,139 @@ +/* + * copyright (c) 2015 Stephan Holljes + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @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 <unistd.h> +#include <libavutil/opt.h> + +void process_client(AVIOContext *client, const char* in_uri) +{ + AVIOContext *input = NULL; + uint8_t buf[1024]; + int ret, n, http_code; + char *resource; + for (;;) { + if ((ret = avio_handshake(client)) < 0) + goto end; + av_opt_get(client, "resource", AV_OPT_SEARCH_CHILDREN, &resource); + resource++; + av_log(client, AV_LOG_TRACE, "resource=%s\n", resource); + if (strcmp(resource, in_uri)) { + http_code = 404; + } else { + http_code = 200; + } + av_opt_set_int(client, "http_code", http_code, AV_OPT_SEARCH_CHILDREN); + if (ret == 0) + break; + } + fprintf(stderr, "Handshake performed.\n"); + if (http_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\n", in_uri); + 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)); + ret = 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) + goto end; + if ((ret = avio_open2(&server, out_uri, AVIO_FLAG_WRITE, NULL, &options)) < 0) + goto end; + 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: "); + fprintf(stderr, "%s\n", av_err2str(ret)); + return 1; + } + return 0; +} -- 2.1.0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel