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vdr-plugin-iptv/protocolfile.c

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/*
* protocolfile.c: IPTV plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
*/
#include <fcntl.h>
#include <unistd.h>
#include <vdr/device.h>
#include "common.h"
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#include "config.h"
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#include "protocolfile.h"
cIptvProtocolFile::cIptvProtocolFile()
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: fileDelay(0),
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fileStream(NULL),
isActive(false)
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{
debug("cIptvProtocolFile::cIptvProtocolFile()\n");
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fileLocation = strdup("");
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}
cIptvProtocolFile::~cIptvProtocolFile()
{
debug("cIptvProtocolFile::~cIptvProtocolFile()\n");
// Drop open handles
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cIptvProtocolFile::Close();
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// Free allocated memory
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free(fileLocation);
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}
bool cIptvProtocolFile::OpenFile(void)
{
debug("cIptvProtocolFile::OpenFile()\n");
// Check that stream address is valid
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if (!isActive && !isempty(fileLocation)) {
fileStream = fopen(fileLocation, "rb");
ERROR_IF_RET(!fileStream || ferror(fileStream), "fopen()", return false);
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// Update active flag
isActive = true;
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}
return true;
}
void cIptvProtocolFile::CloseFile(void)
{
debug("cIptvProtocolFile::CloseFile()\n");
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// Check that file stream is valid
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if (isActive && !isempty(fileLocation)) {
fclose(fileStream);
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// Update active flag
isActive = false;
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}
}
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int cIptvProtocolFile::Read(unsigned char* BufferAddr, unsigned int BufferLen)
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{
//debug("cIptvProtocolFile::Read()\n");
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// Check errors
if (ferror(fileStream)) {
debug("Read error\n");
return -1;
}
// Rewind if EOF
if (feof(fileStream))
rewind(fileStream);
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// Sleep before reading the file stream to prevent aggressive busy looping
// and prevent transfer ringbuffer overflows
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if (fileDelay)
cCondWait::SleepMs(fileDelay);
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// This check is to prevent a race condition where file may be switched off
// during the sleep and buffers are disposed. Check here that the plugin is
// still active before accessing the buffers
if (isActive)
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return fread(BufferAddr, sizeof(unsigned char), BufferLen, fileStream);
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return -1;
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}
bool cIptvProtocolFile::Open(void)
{
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debug("cIptvProtocolFile::Open()\n");
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// Open the file stream
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OpenFile();
return true;
}
bool cIptvProtocolFile::Close(void)
{
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debug("cIptvProtocolFile::Close()\n");
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// Close the file stream
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CloseFile();
return true;
}
bool cIptvProtocolFile::Set(const char* Location, const int Parameter, const int Index)
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{
debug("cIptvProtocolFile::Set(): Location=%s Parameter=%d Index=%d\n", Location, Parameter, Index);
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if (!isempty(Location)) {
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// Close the file stream
CloseFile();
// Update stream address and port
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fileLocation = strcpyrealloc(fileLocation, Location);
fileDelay = Parameter;
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// Open the file for input
OpenFile();
}
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return true;
}
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cString cIptvProtocolFile::GetInformation(void)
{
//debug("cIptvProtocolFile::GetInformation()");
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return cString::sprintf("file://%s:%d", fileLocation, fileDelay);
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}