[FFmpeg-devel] [PATCH 8/8] doc/example: Add http multi-client example code
Stephan Holljes
klaxa1337 at googlemail.com
Sat Jul 25 02:38:04 CEST 2015
Signed-off-by: Stephan Holljes <klaxa1337 at googlemail.com>
---
doc/examples/Makefile | 1 +
doc/examples/http_multiclient.c | 163 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 164 insertions(+)
create mode 100644 doc/examples/http_multiclient.c
Changes since last version:
- Changed license
- Use simpler code to communicate with the library.
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..84fc739
--- /dev/null
+++ b/doc/examples/http_multiclient.c
@@ -0,0 +1,163 @@
+/*
+ * 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_log(client, AV_LOG_TRACE, "checking for resource\n");
+ av_opt_get(client, "resource", AV_OPT_SEARCH_CHILDREN, &resource);
+ if (resource && strlen(resource)) {
+ resource++;
+ av_log(client, AV_LOG_TRACE, "got resource: %s (%lu)\n", resource, strlen(resource));
+ break;
+ }
+ }
+
+ if (ret < 0)
+ goto end;
+
+ if (strcmp(resource, in_uri)) {
+ reply_code = AVERROR_HTTP_NOT_FOUND;
+ } else {
+ reply_code = 200;
+ }
+ 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);
+
+ if ((ret = av_opt_set_int(client, "handshake_finish", 1, AV_OPT_SEARCH_CHILDREN)) < 0) {
+ av_log(client, AV_LOG_ERROR, "Failed to set handshake_finish: %s.\n", av_err2str(ret));
+ goto end;
+ }
+
+ 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;
+}
--
2.1.0
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