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