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curl/docs/examples/rtsp.c

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/*
* Copyright (c) 2011, Jim Hollinger
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Jim Hollinger nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined (WIN32)
# include <conio.h> // _getch()
#else
# include <termios.h>
# include <unistd.h>
int _getch(void) {
struct termios oldt, newt;
tcgetattr( STDIN_FILENO, &oldt );
newt = oldt;
newt.c_lflag &= ~( ICANON | ECHO );
tcsetattr( STDIN_FILENO, TCSANOW, &newt );
int ch = getchar();
tcsetattr( STDIN_FILENO, TCSANOW, &oldt );
return ch;
}
#endif
#include <curl/curl.h>
#define VERSION_STR "V1.0"
// error handling macros
#define my_curl_easy_setopt(A, B, C) \
if ((res = curl_easy_setopt((A), (B), (C))) != CURLE_OK) \
fprintf(stderr, "curl_easy_setopt(%s, %s, %s) failed: %d\n", #A, #B, #C, res);
#define my_curl_easy_perform(A) \
if ((res = curl_easy_perform((A))) != CURLE_OK) \
fprintf(stderr, "curl_easy_perform(%s) failed: %d\n", #A, res);
// send RTSP OPTIONS request
void rtsp_options(CURL *curl, const char *uri) {
CURLcode res = CURLE_OK;
printf("\nRTSP: OPTIONS %s\n", uri);
my_curl_easy_setopt(curl, CURLOPT_RTSP_STREAM_URI, uri);
my_curl_easy_setopt(curl, CURLOPT_RTSP_REQUEST, CURL_RTSPREQ_OPTIONS);
my_curl_easy_perform(curl);
}
// send RTSP DESCRIBE request and write sdp response to a file
void rtsp_describe(CURL *curl, const char *uri, const char *sdp_filename) {
CURLcode res = CURLE_OK;
printf("\nRTSP: DESCRIBE %s\n", uri);
FILE *sdp_fp = fopen(sdp_filename, "wt");
if (sdp_fp == NULL) {
fprintf(stderr, "Could not open '%s' for writing\n", sdp_filename);
sdp_fp = stdout;
} else {
printf("Writing SDP to '%s'\n", sdp_filename);
}
my_curl_easy_setopt(curl, CURLOPT_WRITEDATA, sdp_fp);
my_curl_easy_setopt(curl, CURLOPT_RTSP_REQUEST, CURL_RTSPREQ_DESCRIBE);
my_curl_easy_perform(curl);
my_curl_easy_setopt(curl, CURLOPT_WRITEDATA, stdout);
if (sdp_fp != stdout) {
fclose(sdp_fp);
}
}
// send RTSP SETUP request
void rtsp_setup(CURL *curl, const char *uri, const char *transport) {
CURLcode res = CURLE_OK;
printf("\nRTSP: SETUP %s\n", uri);
printf(" TRANSPORT %s\n", transport);
my_curl_easy_setopt(curl, CURLOPT_RTSP_STREAM_URI, uri);
my_curl_easy_setopt(curl, CURLOPT_RTSP_TRANSPORT, transport);
my_curl_easy_setopt(curl, CURLOPT_RTSP_REQUEST, CURL_RTSPREQ_SETUP);
my_curl_easy_perform(curl);
}
// send RTSP PLAY request
void rtsp_play(CURL *curl, const char *uri, const char *range) {
CURLcode res = CURLE_OK;
printf("\nRTSP: PLAY %s\n", uri);
my_curl_easy_setopt(curl, CURLOPT_RTSP_STREAM_URI, uri);
my_curl_easy_setopt(curl, CURLOPT_RANGE, range);
my_curl_easy_setopt(curl, CURLOPT_RTSP_REQUEST, CURL_RTSPREQ_PLAY);
my_curl_easy_perform(curl);
}
// send RTSP TEARDOWN request
void rtsp_teardown(CURL *curl, const char *uri) {
CURLcode res = CURLE_OK;
printf("\nRTSP: TEARDOWN %s\n", uri);
my_curl_easy_setopt(curl, CURLOPT_RTSP_REQUEST, CURL_RTSPREQ_TEARDOWN);
my_curl_easy_perform(curl);
}
// convert url into an sdp filename
void get_sdp_filename(const char *url, char *sdp_filename) {
strcpy(sdp_filename, "video.sdp");
const char *s = strrchr(url, '/');
if (s != NULL) {
s++;
if (s[0] != '\0') {
sprintf(sdp_filename, "%s.sdp", s);
}
}
}
// scan sdp file for media control attribute
void get_media_control_attribute(const char *sdp_filename, char *control) {
control[0] = '\0';
int max_len = 256;
char *s = new char[max_len];
FILE *sdp_fp = fopen(sdp_filename, "rt");
if (sdp_fp != NULL) {
while (fgets(s, max_len - 2, sdp_fp) != NULL) {
sscanf(s, " a = control: %s", control);
}
fclose(sdp_fp);
}
delete []s;
}
// main app
int main(int argc, char * const argv[]) {
const char *transport = "RTP/AVP;unicast;client_port=1234-1235"; // UDP
// const char *transport = "RTP/AVP/TCP;unicast;client_port=1234-1235"; // TCP
const char *range = "0.000-";
int rc = EXIT_SUCCESS;
printf("\nRTSP request %s\n", VERSION_STR);
printf(" Project web site: http://code.google.com/p/rtsprequest/\n");
printf(" Requires cURL V7.20 or greater\n\n");
// check command line
char *basename = NULL;
if ((argc != 2) && (argc != 3)) {
basename = strrchr(argv[0], '/');
if (basename == NULL) {
basename = strrchr(argv[0], '\\');
}
if (basename == NULL) {
basename = argv[0];
} else {
basename++;
}
printf("Usage: %s url [transport]\n", basename);
printf(" url of video server\n");
printf(" transport (optional) specifier for media stream protocol\n");
printf(" default transport: %s\n", transport);
printf("Example: %s rtsp://192.168.0.2/media/video1\n\n", basename);
rc = EXIT_FAILURE;
} else {
const char *url = argv[1];
char *uri = new char[strlen(url) + 32];
char *sdp_filename = new char[strlen(url) + 32];
char *control = new char[strlen(url) + 32];
get_sdp_filename(url, sdp_filename);
if (argc == 3) {
transport = argv[2];
}
// initialize curl
CURLcode res = CURLE_OK;
res = curl_global_init(CURL_GLOBAL_ALL);
if (res == CURLE_OK) {
curl_version_info_data *data = curl_version_info(CURLVERSION_NOW);
fprintf(stderr, " cURL V%s loaded\n", data->version);
// initialize this curl session
CURL *curl = curl_easy_init();
if (curl != NULL) {
my_curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L);
my_curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1L);
my_curl_easy_setopt(curl, CURLOPT_WRITEHEADER, stdout);
my_curl_easy_setopt(curl, CURLOPT_URL, url);
// request server options
sprintf(uri, "%s", url);
rtsp_options(curl, uri);
// request session description and write response to sdp file
rtsp_describe(curl, uri, sdp_filename);
// get media control attribute from sdp file
get_media_control_attribute(sdp_filename, control);
// setup media stream
sprintf(uri, "%s/%s", url, control);
rtsp_setup(curl, uri, transport);
// start playing media stream
sprintf(uri, "%s/", url);
rtsp_play(curl, uri, range);
printf("Playing video, press any key to stop ...");
_getch();
printf("\n");
// teardown session
rtsp_teardown(curl, uri);
// cleanup
curl_easy_cleanup(curl);
curl = NULL;
} else {
fprintf(stderr, "curl_easy_init() failed\n");
}
curl_global_cleanup();
} else {
fprintf(stderr, "curl_global_init(%s) failed\n", "CURL_GLOBAL_ALL", res);
}
delete []control;
delete []sdp_filename;
delete []uri;
}
return rc;
}
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