548 lines
17 KiB
C++
548 lines
17 KiB
C++
//
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// ZoneMinder cURL Camera Class Implementation, $Date: 2009-01-16 12:18:50 +0000 (Fri, 16 Jan 2009) $, $Revision: 2713 $
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// Copyright (C) 2001-2008 Philip Coombes
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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//
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#include "zm.h"
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#include "zm_curl_camera.h"
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#include "zm_packetqueue.h"
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#if HAVE_LIBCURL
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#define CURL_MAXRETRY 5
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#define CURL_BUFFER_INITIAL_SIZE 65536
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const char* content_length_match = "Content-Length:";
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const char* content_type_match = "Content-Type:";
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size_t content_length_match_len;
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size_t content_type_match_len;
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cURLCamera::cURLCamera( int p_id, const std::string &p_path, const std::string &p_user, const std::string &p_pass, unsigned int p_width, unsigned int p_height, int p_colours, int p_brightness, int p_contrast, int p_hue, int p_colour, bool p_capture, bool p_record_audio ) :
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Camera( p_id, CURL_SRC, p_width, p_height, p_colours, ZM_SUBPIX_ORDER_DEFAULT_FOR_COLOUR(p_colours), p_brightness, p_contrast, p_hue, p_colour, p_capture, p_record_audio ),
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mPath( p_path ), mUser( p_user ), mPass ( p_pass ), bTerminate( false ), bReset( false ), mode ( MODE_UNSET )
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{
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if ( capture ) {
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Initialise();
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}
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}
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cURLCamera::~cURLCamera() {
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if ( capture ) {
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Terminate();
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}
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}
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void cURLCamera::Initialise() {
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content_length_match_len = strlen(content_length_match);
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content_type_match_len = strlen(content_type_match);
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databuffer.expand(CURL_BUFFER_INITIAL_SIZE);
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/* cURL initialization */
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CURLcode cRet = curl_global_init(CURL_GLOBAL_ALL);
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if(cRet != CURLE_OK) {
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Fatal("libcurl initialization failed: ", curl_easy_strerror(cRet));
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}
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Debug(2,"libcurl version: %s",curl_version());
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/* Create the shared data mutex */
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int nRet = pthread_mutex_init(&shareddata_mutex, NULL);
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if(nRet != 0) {
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Fatal("Shared data mutex creation failed: %s",strerror(nRet));
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}
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/* Create the data available condition variable */
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nRet = pthread_cond_init(&data_available_cond, NULL);
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if(nRet != 0) {
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Fatal("Data available condition variable creation failed: %s",strerror(nRet));
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}
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/* Create the request complete condition variable */
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nRet = pthread_cond_init(&request_complete_cond, NULL);
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if(nRet != 0) {
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Fatal("Request complete condition variable creation failed: %s",strerror(nRet));
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}
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/* Create the thread */
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nRet = pthread_create(&thread, NULL, thread_func_dispatcher, this);
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if(nRet != 0) {
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Fatal("Thread creation failed: %s",strerror(nRet));
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}
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}
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void cURLCamera::Terminate() {
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/* Signal the thread to terminate */
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bTerminate = true;
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/* Wait for thread termination */
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pthread_join(thread, NULL);
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/* Destroy condition variables */
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pthread_cond_destroy(&request_complete_cond);
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pthread_cond_destroy(&data_available_cond);
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/* Destroy mutex */
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pthread_mutex_destroy(&shareddata_mutex);
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/* cURL cleanup */
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curl_global_cleanup();
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}
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int cURLCamera::PrimeCapture() {
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//Info( "Priming capture from %s", mPath.c_str() );
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return 0;
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}
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int cURLCamera::PreCapture() {
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// Nothing to do here
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return( 0 );
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}
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int cURLCamera::Capture( Image &image ) {
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bool frameComplete = false;
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/* MODE_STREAM specific variables */
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bool SubHeadersParsingComplete = false;
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unsigned int frame_content_length = 0;
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std::string frame_content_type;
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bool need_more_data = false;
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int nRet;
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/* Grab the mutex to ensure exclusive access to the shared data */
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lock();
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while ( !frameComplete ) {
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/* If the work thread did a reset, reset our local variables */
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if ( bReset ) {
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SubHeadersParsingComplete = false;
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frame_content_length = 0;
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frame_content_type.clear();
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need_more_data = false;
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bReset = false;
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}
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if ( mode == MODE_UNSET ) {
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/* Don't have a mode yet. Sleep while waiting for data */
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nRet = pthread_cond_wait(&data_available_cond,&shareddata_mutex);
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if ( nRet != 0 ) {
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Error("Failed waiting for available data condition variable: %s",strerror(nRet));
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return -20;
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}
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}
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if ( mode == MODE_STREAM ) {
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/* Subheader parsing */
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while( !SubHeadersParsingComplete && !need_more_data ) {
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size_t crlf_start, crlf_end, crlf_size;
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std::string subheader;
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/* Check if the buffer contains something */
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if ( databuffer.empty() ) {
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/* Empty buffer, wait for data */
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need_more_data = true;
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break;
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}
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/* Find crlf start */
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crlf_start = memcspn(databuffer,"\r\n",databuffer.size());
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if ( crlf_start == databuffer.size() ) {
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/* Not found, wait for more data */
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need_more_data = true;
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break;
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}
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/* See if we have enough data for determining crlf length */
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if ( databuffer.size() < crlf_start+5 ) {
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/* Need more data */
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need_more_data = true;
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break;
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}
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/* Find crlf end and calculate crlf size */
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crlf_end = memspn(((const char*)databuffer.head())+crlf_start,"\r\n",5);
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crlf_size = (crlf_start + crlf_end) - crlf_start;
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/* Is this the end of a previous stream? (This is just before the boundary) */
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if ( crlf_start == 0 ) {
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databuffer.consume(crlf_size);
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continue;
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}
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/* Check for invalid CRLF size */
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if ( crlf_size > 4 ) {
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Error("Invalid CRLF length");
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}
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/* Check if the crlf is \n\n or \r\n\r\n (marks end of headers, this is the last header) */
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if( (crlf_size == 2 && memcmp(((const char*)databuffer.head())+crlf_start,"\n\n",2) == 0) || (crlf_size == 4 && memcmp(((const char*)databuffer.head())+crlf_start,"\r\n\r\n",4) == 0) ) {
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/* This is the last header */
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SubHeadersParsingComplete = true;
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}
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/* Copy the subheader, excluding the crlf */
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subheader.assign(databuffer, crlf_start);
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/* Advance the buffer past this one */
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databuffer.consume(crlf_start+crlf_size);
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Debug(7,"Got subheader: %s",subheader.c_str());
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/* Find where the data in this header starts */
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size_t subheader_data_start = subheader.rfind(' ');
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if ( subheader_data_start == std::string::npos ) {
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subheader_data_start = subheader.find(':');
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}
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/* Extract the data into a string */
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std::string subheader_data = subheader.substr(subheader_data_start+1, std::string::npos);
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Debug(8,"Got subheader data: %s",subheader_data.c_str());
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/* Check the header */
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if(strncasecmp(subheader.c_str(),content_length_match,content_length_match_len) == 0) {
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/* Found the content-length header */
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frame_content_length = atoi(subheader_data.c_str());
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Debug(6,"Got content-length subheader: %d",frame_content_length);
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} else if(strncasecmp(subheader.c_str(),content_type_match,content_type_match_len) == 0) {
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/* Found the content-type header */
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frame_content_type = subheader_data;
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Debug(6,"Got content-type subheader: %s",frame_content_type.c_str());
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}
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}
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/* Attempt to extract the frame */
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if(!need_more_data) {
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if(!SubHeadersParsingComplete) {
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/* We haven't parsed all headers yet */
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need_more_data = true;
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} else if ( ! frame_content_length ) {
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/* Invalid frame */
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Error("Invalid frame: invalid content length");
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} else if ( frame_content_type != "image/jpeg" ) {
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/* Unsupported frame type */
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Error("Unsupported frame: %s",frame_content_type.c_str());
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} else if(frame_content_length > databuffer.size()) {
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/* Incomplete frame, wait for more data */
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need_more_data = true;
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} else {
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/* All good. decode the image */
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image.DecodeJpeg(databuffer.extract(frame_content_length), frame_content_length, colours, subpixelorder);
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frameComplete = true;
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}
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}
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/* Attempt to get more data */
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if(need_more_data) {
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nRet = pthread_cond_wait(&data_available_cond,&shareddata_mutex);
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if(nRet != 0) {
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Error("Failed waiting for available data condition variable: %s",strerror(nRet));
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return -18;
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}
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need_more_data = false;
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}
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} else if(mode == MODE_SINGLE) {
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/* Check if we have anything */
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if (!single_offsets.empty()) {
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if( (single_offsets.front() > 0) && (databuffer.size() >= single_offsets.front()) ) {
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/* Extract frame */
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image.DecodeJpeg(databuffer.extract(single_offsets.front()), single_offsets.front(), colours, subpixelorder);
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single_offsets.pop_front();
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frameComplete = true;
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} else {
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/* This shouldn't happen */
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Error("Internal error. Attempting recovery");
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databuffer.consume(single_offsets.front());
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single_offsets.pop_front();
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}
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} else {
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/* Don't have a frame yet, wait for the request complete condition variable */
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nRet = pthread_cond_wait(&request_complete_cond,&shareddata_mutex);
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if(nRet != 0) {
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Error("Failed waiting for request complete condition variable: %s",strerror(nRet));
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return -19;
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}
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}
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} else {
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/* Failed to match content-type */
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Fatal("Unable to match Content-Type. Check URL, username and password");
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} /* mode */
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} /* frameComplete loop */
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/* Release the mutex */
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unlock();
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if(!frameComplete)
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return -1;
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return 0;
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}
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int cURLCamera::PostCapture() {
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// Nothing to do here
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return( 0 );
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}
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int cURLCamera::CaptureAndRecord( Image &image, struct timeval recording, char* event_directory ) {
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Error("Capture and Record not implemented for the cURL camera type");
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// Nothing to do here
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return( 0 );
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}
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size_t cURLCamera::data_callback(void *buffer, size_t size, size_t nmemb, void *userdata) {
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lock();
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/* Append the data we just received to our buffer */
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databuffer.append((const char*)buffer, size*nmemb);
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/* Signal data available */
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int nRet = pthread_cond_signal(&data_available_cond);
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if ( nRet != 0 ) {
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Error("Failed signaling data available condition variable: %s",strerror(nRet));
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unlock();
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return -16;
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}
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unlock();
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/* Return bytes processed */
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return size*nmemb;
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}
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size_t cURLCamera::header_callback( void *buffer, size_t size, size_t nmemb, void *userdata) {
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std::string header;
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header.assign((const char*)buffer, size*nmemb);
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Debug(4,"Got header: %s",header.c_str());
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/* Check Content-Type header */
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if(strncasecmp(header.c_str(),content_type_match,content_type_match_len) == 0) {
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size_t pos = header.find(';');
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if(pos != std::string::npos) {
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header.erase(pos, std::string::npos);
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}
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pos = header.rfind(' ');
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if(pos == std::string::npos) {
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pos = header.find(':');
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}
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std::string content_type = header.substr(pos+1, std::string::npos);
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Debug(6,"Content-Type is: %s",content_type.c_str());
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lock();
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const char* multipart_match = "multipart/x-mixed-replace";
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const char* image_jpeg_match = "image/jpeg";
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if(strncasecmp(content_type.c_str(),multipart_match,strlen(multipart_match)) == 0) {
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Debug(7,"Content type matched as multipart/x-mixed-replace");
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mode = MODE_STREAM;
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} else if(strncasecmp(content_type.c_str(),image_jpeg_match,strlen(image_jpeg_match)) == 0) {
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Debug(7,"Content type matched as image/jpeg");
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mode = MODE_SINGLE;
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}
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unlock();
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}
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/* Return bytes processed */
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return size*nmemb;
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}
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void* cURLCamera::thread_func() {
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long tRet;
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double dSize;
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c = curl_easy_init();
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if(c == NULL) {
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Fatal("Failed getting easy handle from libcurl");
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}
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CURLcode cRet;
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/* Set URL */
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cRet = curl_easy_setopt(c, CURLOPT_URL, mPath.c_str());
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if(cRet != CURLE_OK)
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Fatal("Failed setting libcurl URL: %s", curl_easy_strerror(cRet));
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/* Header callback */
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cRet = curl_easy_setopt(c, CURLOPT_HEADERFUNCTION, &header_callback_dispatcher);
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if(cRet != CURLE_OK)
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Fatal("Failed setting libcurl header callback function: %s", curl_easy_strerror(cRet));
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cRet = curl_easy_setopt(c, CURLOPT_HEADERDATA, this);
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if(cRet != CURLE_OK)
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Fatal("Failed setting libcurl header callback object: %s", curl_easy_strerror(cRet));
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/* Data callback */
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cRet = curl_easy_setopt(c, CURLOPT_WRITEFUNCTION, &data_callback_dispatcher);
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if(cRet != CURLE_OK)
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Fatal("Failed setting libcurl data callback function: %s", curl_easy_strerror(cRet));
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cRet = curl_easy_setopt(c, CURLOPT_WRITEDATA, this);
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if(cRet != CURLE_OK)
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Fatal("Failed setting libcurl data callback object: %s", curl_easy_strerror(cRet));
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/* Progress callback */
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cRet = curl_easy_setopt(c, CURLOPT_NOPROGRESS, 0);
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if(cRet != CURLE_OK)
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Fatal("Failed enabling libcurl progress callback function: %s", curl_easy_strerror(cRet));
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cRet = curl_easy_setopt(c, CURLOPT_PROGRESSFUNCTION, &progress_callback_dispatcher);
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if(cRet != CURLE_OK)
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Fatal("Failed setting libcurl progress callback function: %s", curl_easy_strerror(cRet));
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cRet = curl_easy_setopt(c, CURLOPT_PROGRESSDATA, this);
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if(cRet != CURLE_OK)
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Fatal("Failed setting libcurl progress callback object: %s", curl_easy_strerror(cRet));
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/* Set username and password */
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if(!mUser.empty()) {
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cRet = curl_easy_setopt(c, CURLOPT_USERNAME, mUser.c_str());
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if(cRet != CURLE_OK)
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Error("Failed setting username: %s", curl_easy_strerror(cRet));
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}
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if(!mPass.empty()) {
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cRet = curl_easy_setopt(c, CURLOPT_PASSWORD, mPass.c_str());
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if(cRet != CURLE_OK)
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Error("Failed setting password: %s", curl_easy_strerror(cRet));
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}
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/* Authenication preference */
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cRet = curl_easy_setopt(c, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
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if(cRet != CURLE_OK)
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Warning("Failed setting libcurl acceptable http authenication methods: %s", curl_easy_strerror(cRet));
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/* Work loop */
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for(int attempt=1;attempt<=CURL_MAXRETRY;attempt++) {
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tRet = 0;
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while(!bTerminate) {
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/* Do the work */
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cRet = curl_easy_perform(c);
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if(mode == MODE_SINGLE) {
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if(cRet != CURLE_OK) {
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break;
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}
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/* Attempt to get the size of the file */
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cRet = curl_easy_getinfo(c, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &dSize);
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if(cRet != CURLE_OK) {
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break;
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}
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/* We need to lock for the offsets array and the condition variable */
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lock();
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/* Push the size into our offsets array */
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if(dSize > 0) {
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single_offsets.push_back(dSize);
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} else {
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Fatal("Unable to get the size of the image");
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}
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/* Signal the request complete condition variable */
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tRet = pthread_cond_signal(&request_complete_cond);
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if(tRet != 0) {
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Error("Failed signaling request completed condition variable: %s",strerror(tRet));
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}
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/* Unlock */
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unlock();
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} else if (mode == MODE_STREAM) {
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break;
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}
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}
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/* Return value checking */
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if(cRet == CURLE_ABORTED_BY_CALLBACK || bTerminate) {
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/* Aborted */
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break;
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} else if (cRet != CURLE_OK) {
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/* Some error */
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Error("cURL Request failed: %s",curl_easy_strerror(cRet));
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if(attempt < CURL_MAXRETRY) {
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Error("Retrying.. Attempt %d of %d",attempt,CURL_MAXRETRY);
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/* Do a reset */
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lock();
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databuffer.clear();
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single_offsets.clear();
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mode = MODE_UNSET;
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bReset = true;
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unlock();
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}
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tRet = -50;
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}
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}
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/* Cleanup */
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curl_easy_cleanup(c);
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c = NULL;
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|
return (void*)tRet;
|
|
}
|
|
|
|
int cURLCamera::lock() {
|
|
int nRet;
|
|
|
|
/* Lock shared data */
|
|
nRet = pthread_mutex_lock(&shareddata_mutex);
|
|
if(nRet != 0) {
|
|
Error("Failed locking shared data mutex: %s",strerror(nRet));
|
|
}
|
|
return nRet;
|
|
}
|
|
|
|
int cURLCamera::unlock() {
|
|
int nRet;
|
|
|
|
/* Unlock shared data */
|
|
nRet = pthread_mutex_unlock(&shareddata_mutex);
|
|
if(nRet != 0) {
|
|
Error("Failed unlocking shared data mutex: %s",strerror(nRet));
|
|
}
|
|
return nRet;
|
|
}
|
|
|
|
int cURLCamera::progress_callback(void *userdata, double dltotal, double dlnow, double ultotal, double ulnow) {
|
|
/* Signal the curl thread to terminate */
|
|
if(bTerminate)
|
|
return -10;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* These functions call the functions in the class for the correct object */
|
|
size_t data_callback_dispatcher(void *buffer, size_t size, size_t nmemb, void *userdata) {
|
|
return reinterpret_cast<cURLCamera*>(userdata)->data_callback(buffer,size,nmemb,userdata);
|
|
}
|
|
|
|
size_t header_callback_dispatcher(void *buffer, size_t size, size_t nmemb, void *userdata) {
|
|
return reinterpret_cast<cURLCamera*>(userdata)->header_callback(buffer,size,nmemb,userdata);
|
|
}
|
|
|
|
int progress_callback_dispatcher(void *userdata, double dltotal, double dlnow, double ultotal, double ulnow) {
|
|
return reinterpret_cast<cURLCamera*>(userdata)->progress_callback(userdata,dltotal,dlnow,ultotal,ulnow);
|
|
}
|
|
|
|
void* thread_func_dispatcher(void* object) {
|
|
return reinterpret_cast<cURLCamera*>(object)->thread_func();
|
|
}
|
|
|
|
#endif // HAVE_LIBCURL
|