/*
* 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.
*
*/
/* <DESC>
* A basic RTSP transfer
* </DESC>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined (WIN32)
# include <conio.h> /* _getch() */
#else
# include <termios.h>
# include <unistd.h>
static int _getch(void)
{
struct termios oldt, newt;
int ch;
tcgetattr(STDIN_FILENO, &oldt);
newt = oldt;
newt.c_lflag &= ~( ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &newt);
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) \
res = curl_easy_setopt((A), (B), (C)); \
if(res != CURLE_OK) \
fprintf(stderr, "curl_easy_setopt(%s, %s, %s) failed: %d\n", \
#A, #B, #C, res);
#define my_curl_easy_perform(A) \
res = curl_easy_perform(A); \
if(res != CURLE_OK) \
fprintf(stderr, "curl_easy_perform(%s) failed: %d\n", #A, res);
/* send RTSP OPTIONS request */
static 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, (long)CURL_RTSPREQ_OPTIONS);
my_curl_easy_perform(curl);
}
/* send RTSP DESCRIBE request and write sdp response to a file */
static void rtsp_describe(CURL *curl, const char *uri,
const char *sdp_filename)
{
CURLcode res = CURLE_OK;
FILE *sdp_fp = fopen(sdp_filename, "wb");
printf("\nRTSP: DESCRIBE %s\n", uri);
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, (long)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 */
static 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, (long)CURL_RTSPREQ_SETUP);
my_curl_easy_perform(curl);
}
/* send RTSP PLAY request */
static 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, (long)CURL_RTSPREQ_PLAY);
my_curl_easy_perform(curl);
/* switch off using range again */
my_curl_easy_setopt(curl, CURLOPT_RANGE, NULL);
}
/* send RTSP TEARDOWN request */
static 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, (long)CURL_RTSPREQ_TEARDOWN);
my_curl_easy_perform(curl);
}
/* convert url into an sdp filename */
static void get_sdp_filename(const char *url, char *sdp_filename,
size_t namelen)
{
const char *s = strrchr(url, '/');
strcpy(sdp_filename, "video.sdp");
if(s != NULL) {
s++;
if(s[0] != '\0') {
snprintf(sdp_filename, namelen, "%s.sdp", s);
}
}
}
/* scan sdp file for media control attribute */
static void get_media_control_attribute(const char *sdp_filename,
char *control)
{
int max_len = 256;
char *s = malloc(max_len);
FILE *sdp_fp = fopen(sdp_filename, "rb");
control[0] = '\0';
if(sdp_fp != NULL) {
while(fgets(s, max_len - 2, sdp_fp) != NULL) {
sscanf(s, " a = control: %s", control);
}
fclose(sdp_fp);
}
free(s);
}
/* main app */
int main(int argc, char * const argv[])
{
#if 1
const char *transport = "RTP/AVP;unicast;client_port=1234-1235"; /* UDP */
#else
/* TCP */
const char *transport = "RTP/AVP/TCP;unicast;client_port=1234-1235";
#endif
const char *range = "0.000-";
int rc = EXIT_SUCCESS;
char *base_name = NULL;
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 */
if((argc != 2) && (argc != 3)) {
base_name = strrchr(argv[0], '/');
if(base_name == NULL) {
base_name = strrchr(argv[0], '\\');
}
if(base_name == NULL) {
base_name = argv[0];
}
else {
base_name++;
}
printf("Usage: %s url [transport]\n", base_name);
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", base_name);
rc = EXIT_FAILURE;
}
else {
const char *url = argv[1];
char *uri = malloc(strlen(url) + 32);
char *sdp_filename = malloc(strlen(url) + 32);
char *control = malloc(strlen(url) + 32);
CURLcode res;
get_sdp_filename(url, sdp_filename, strlen(url) + 32);
if(argc == 3) {
transport = argv[2];
}
/* initialize curl */
res = curl_global_init(CURL_GLOBAL_ALL);
if(res == CURLE_OK) {
curl_version_info_data *data = curl_version_info(CURLVERSION_NOW);
CURL *curl;
fprintf(stderr, " curl V%s loaded\n", data->version);
/* initialize this curl session */
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_HEADERDATA, stdout);
my_curl_easy_setopt(curl, CURLOPT_URL, url);
/* request server options */
snprintf(uri, strlen(url) + 32, "%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 */
snprintf(uri, strlen(url) + 32, "%s/%s", url, control);
rtsp_setup(curl, uri, transport);
/* start playing media stream */
snprintf(uri, strlen(url) + 32, "%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: %d\n",
"CURL_GLOBAL_ALL", res);
}
free(control);
free(sdp_filename);
free(uri);
}
return rc;
}