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/* $Id$ */ |
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|
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/* |
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* FreeBob Streaming API |
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* FreeBob = Firewire (pro-)audio for linux |
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* |
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* http://freebob.sf.net |
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* |
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* Copyright (C) 2006 Pieter Palmers <pieterpalmers@users.sourceforge.net> |
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* |
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* This program is free software {} you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation {} either version 2 of the License, or |
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* (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., 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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* |
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* |
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*/ |
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#include "IsoHandlerManager.h" |
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#include "IsoHandler.h" |
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#include "IsoStream.h" |
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#include <assert.h> |
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namespace FreebobStreaming |
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{ |
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IMPL_DEBUG_MODULE( IsoHandlerManager, IsoHandlerManager, DEBUG_LEVEL_NORMAL ); |
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IsoHandlerManager::IsoHandlerManager() : |
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m_poll_timeout(100), m_poll_fds(0), m_poll_nfds(0) |
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{ |
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} |
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IsoHandlerManager::~IsoHandlerManager() |
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{ |
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} |
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bool IsoHandlerManager::Init() |
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{ |
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debugOutput( DEBUG_LEVEL_VERBOSE, "enter...\n"); |
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return true; |
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} |
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|
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// Intel recommends that a serializing instruction |
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// should be called before and after rdtsc. |
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// CPUID is a serializing instruction. |
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#define read_rdtsc(time) \ |
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__asm__ __volatile__( \ |
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"pushl %%ebx\n\t" \ |
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"cpuid\n\t" \ |
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"rdtsc\n\t" \ |
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"mov %%eax,(%0)\n\t" \ |
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"cpuid\n\t" \ |
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"popl %%ebx\n\t" \ |
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: /* no output */ \ |
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: "S"(&time) \ |
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: "eax", "ecx", "edx", "memory") |
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|
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static inline unsigned long debugGetCurrentUTime() { |
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unsigned retval; |
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read_rdtsc(retval); |
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return retval; |
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} |
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bool IsoHandlerManager::Execute() |
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{ |
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int err; |
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int i=0; |
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debugOutput( DEBUG_LEVEL_VERY_VERBOSE, "enter...\n"); |
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unsigned long tstamp=debugGetCurrentUTime(); |
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err = poll (m_poll_fds, m_poll_nfds, m_poll_timeout); |
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// debugOutput(DEBUG_LEVEL_VERBOSE, "Poll took: %6d\n", debugGetCurrentUTime()-tstamp); |
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if (err == -1) { |
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if (errno == EINTR) { |
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return true; |
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} |
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debugFatal("poll error: %s\n", strerror (errno)); |
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return false; |
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} |
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for (i = 0; i < m_poll_nfds; i++) { |
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if (m_poll_fds[i].revents & POLLERR) { |
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debugWarning("error on fd for %d\n",i); |
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} |
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if (m_poll_fds[i].revents & POLLHUP) { |
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debugWarning("hangup on fd for %d\n",i); |
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} |
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if(m_poll_fds[i].revents & (POLLIN)) { |
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IsoHandler *s=m_IsoHandlers.at(i); |
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assert(s); |
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unsigned int packetcount_prev=s->getPacketCount(); |
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tstamp=debugGetCurrentUTime(); |
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s->iterate(); |
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/* debugOutput(DEBUG_LEVEL_VERBOSE, "Iterate %p: time: %6d | packets: %3d\n", |
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s, debugGetCurrentUTime()-tstamp, s->getPacketCount()-packetcount_prev |
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);*/ |
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} |
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} |
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return true; |
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} |
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bool IsoHandlerManager::prepare() |
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{ |
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debugOutput( DEBUG_LEVEL_VERBOSE, "enter...\n"); |
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for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
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it != m_IsoHandlers.end(); |
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++it ) |
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{ |
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if(!(*it)->prepare()) { |
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debugFatal("Could not prepare handlers\n"); |
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return false; |
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} |
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} |
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return true; |
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} |
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bool IsoHandlerManager::registerHandler(IsoHandler *handler) |
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{ |
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debugOutput( DEBUG_LEVEL_VERBOSE, "enter...\n"); |
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assert(handler); |
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m_IsoHandlers.push_back(handler); |
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handler->setVerboseLevel(getDebugLevel()); |
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// rebuild the fd map for poll()'ing. |
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return rebuildFdMap(); |
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} |
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bool IsoHandlerManager::unregisterHandler(IsoHandler *handler) |
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{ |
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debugOutput( DEBUG_LEVEL_VERBOSE, "enter...\n"); |
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assert(handler); |
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for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
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it != m_IsoHandlers.end(); |
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++it ) |
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{ |
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if ( *it == handler ) { |
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// erase the iso handler from the list |
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m_IsoHandlers.erase(it); |
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// rebuild the fd map for poll()'ing. |
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return rebuildFdMap(); |
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} |
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} |
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debugFatal("Could not find handler (%p)\n", handler); |
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return false; //not found |
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} |
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bool IsoHandlerManager::rebuildFdMap() { |
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debugOutput( DEBUG_LEVEL_VERBOSE, "enter...\n"); |
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int i=0; |
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m_poll_nfds=0; |
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if(m_poll_fds) free(m_poll_fds); |
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// count the number of handlers |
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m_poll_nfds=m_IsoHandlers.size(); |
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// allocate the fd array |
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m_poll_fds = (struct pollfd *) calloc (m_poll_nfds, sizeof (struct pollfd)); |
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if(!m_poll_fds) { |
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debugFatal("Could not allocate memory for poll FD array\n"); |
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return false; |
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} |
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// fill the fd map |
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for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
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it != m_IsoHandlers.end(); |
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++it ) |
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{ |
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m_poll_fds[i].fd=(*it)->getFileDescriptor(); |
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m_poll_fds[i].events = POLLIN; |
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i++; |
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} |
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return true; |
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} |
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void IsoHandlerManager::disablePolling(IsoStream *stream) { |
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debugOutput(DEBUG_LEVEL_VERY_VERBOSE, "Disable polling on stream %p\n",stream); |
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int i=0; |
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for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
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it != m_IsoHandlers.end(); |
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++it ) |
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{ |
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if ((*it)->isStreamRegistered(stream)) { |
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m_poll_fds[i].events = 0; |
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m_poll_fds[i].revents = 0; |
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debugOutput(DEBUG_LEVEL_VERY_VERBOSE, "polling disabled\n"); |
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} |
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i++; |
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} |
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} |
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void IsoHandlerManager::enablePolling(IsoStream *stream) { |
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debugOutput(DEBUG_LEVEL_VERY_VERBOSE, "Enable polling on stream %p\n",stream); |
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int i=0; |
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for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
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it != m_IsoHandlers.end(); |
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++it ) |
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{ |
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if ((*it)->isStreamRegistered(stream)) { |
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m_poll_fds[i].events = POLLIN; |
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m_poll_fds[i].revents = 0; |
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debugOutput(DEBUG_LEVEL_VERY_VERBOSE, "polling enabled\n"); |
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} |
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i++; |
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} |
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} |
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/** |
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* Registers an IsoStream with the IsoHandlerManager. |
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* |
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* If nescessary, an IsoHandler is created to handle this stream. |
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* Once an IsoStream is registered to the handler, it will be included |
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* in the ISO streaming cycle (i.e. receive/transmit of it will occur). |
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* |
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* @param stream the stream to register |
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* @return true if registration succeeds |
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* |
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* \todo : currently there is a one-to-one mapping |
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* between streams and handlers, this is not ok for |
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* multichannel receive |
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*/ |
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bool IsoHandlerManager::registerStream(IsoStream *stream) |
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{ |
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debugOutput( DEBUG_LEVEL_VERBOSE, "Registering stream %p\n",stream); |
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assert(stream); |
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// make sure the stream isn't already attached to a handler |
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for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
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it != m_IsoHandlers.end(); |
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++it ) |
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{ |
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if((*it)->isStreamRegistered(stream)) { |
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debugWarning( "stream already registered!\n"); |
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(*it)->unregisterStream(stream); |
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} |
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} |
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// clean up all handlers that aren't used |
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pruneHandlers(); |
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// allocate a handler for this stream |
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if (stream->getType()==IsoStream::EST_Receive) { |
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// setup the optimal parameters for the raw1394 ISO buffering |
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unsigned int packets_per_period=stream->getPacketsPerPeriod(); |
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// hardware interrupts occur when one DMA block is full, and the size of one DMA |
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// block = PAGE_SIZE. Setting the max_packet_size makes sure that the HW irq is |
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// occurs at a period boundary (optimal CPU use) |
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// NOTE: try and use 4 hardware interrupts per period for better latency. |
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unsigned int max_packet_size=4 * getpagesize() / packets_per_period; |
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if (max_packet_size < stream->getMaxPacketSize()) { |
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max_packet_size=stream->getMaxPacketSize(); |
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} |
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// Ensure we don't request a packet size bigger than the |
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// kernel-enforced maximum which is currently 1 page. |
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if (max_packet_size > (unsigned int)getpagesize()) |
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max_packet_size = getpagesize(); |
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int irq_interval=packets_per_period / 4; |
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if(irq_interval <= 0) irq_interval=1; |
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/* the receive buffer size doesn't matter for the latency, |
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but it has a minimal value in order for libraw to operate correctly (300) */ |
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int buffers=400; |
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// create the actual handler |
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IsoRecvHandler *h = new IsoRecvHandler(stream->getPort(), buffers, |
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max_packet_size, irq_interval); |
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debugOutput( DEBUG_LEVEL_VERBOSE, " registering IsoRecvHandler\n"); |
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if(!h) { |
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debugFatal("Could not create IsoRecvHandler\n"); |
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return false; |
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} |
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h->setVerboseLevel(getDebugLevel()); |
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// init the handler |
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if(!h->init()) { |
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debugFatal("Could not initialize receive handler\n"); |
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return false; |
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} |
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// register the stream with the handler |
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if(!h->registerStream(stream)) { |
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debugFatal("Could not register receive stream with handler\n"); |
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return false; |
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} |
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// register the handler with the manager |
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if(!registerHandler(h)) { |
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debugFatal("Could not register receive handler with manager\n"); |
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return false; |
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} |
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debugOutput( DEBUG_LEVEL_VERBOSE, " registered stream (%p) with handler (%p)\n",stream,h); |
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} |
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|
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if (stream->getType()==IsoStream::EST_Transmit) { |
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|
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// setup the optimal parameters for the raw1394 ISO buffering |
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unsigned int packets_per_period=stream->getPacketsPerPeriod(); |
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// hardware interrupts occur when one DMA block is full, and the size of one DMA |
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// block = PAGE_SIZE. Setting the max_packet_size makes sure that the HW irq |
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// occurs at a period boundary (optimal CPU use) |
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// NOTE: try and use 4 interrupts per period for better latency. |
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unsigned int max_packet_size=4 * getpagesize() / packets_per_period; |
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if (max_packet_size < stream->getMaxPacketSize()) { |
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max_packet_size=stream->getMaxPacketSize(); |
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} |
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|
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// Ensure we don't request a packet size bigger than the |
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// kernel-enforced maximum which is currently 1 page. |
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if (max_packet_size > (unsigned int)getpagesize()) |
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max_packet_size = getpagesize(); |
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int irq_interval=packets_per_period / 4; |
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if(irq_interval <= 0) irq_interval=1; |
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// the transmit buffer size should be as low as possible for latency. |
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// note however that the raw1394 subsystem tries to keep this buffer |
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// full, so we have to make sure that we have enough events in our |
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// event buffers |
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int buffers=packets_per_period; |
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// NOTE: this is dangerous: what if there is not enough prefill? |
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// if (buffers<10) buffers=10; |
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// create the actual handler |
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IsoXmitHandler *h = new IsoXmitHandler(stream->getPort(), buffers, |
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max_packet_size, irq_interval); |
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debugOutput( DEBUG_LEVEL_VERBOSE, " registering IsoXmitHandler\n"); |
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if(!h) { |
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debugFatal("Could not create IsoXmitHandler\n"); |
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return false; |
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} |
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h->setVerboseLevel(getDebugLevel()); |
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|
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// init the handler |
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if(!h->init()) { |
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debugFatal("Could not initialize transmit handler\n"); |
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return false; |
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} |
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|
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// register the stream with the handler |
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if(!h->registerStream(stream)) { |
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debugFatal("Could not register transmit stream with handler\n"); |
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return false; |
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} |
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|
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// register the handler with the manager |
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if(!registerHandler(h)) { |
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debugFatal("Could not register transmit handler with manager\n"); |
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return false; |
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} |
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debugOutput( DEBUG_LEVEL_VERBOSE, " registered stream (%p) with handler (%p)\n",stream,h); |
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|
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} |
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m_IsoStreams.push_back(stream); |
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debugOutput( DEBUG_LEVEL_VERBOSE, " %d streams, %d handlers registered\n", |
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m_IsoStreams.size(), m_IsoHandlers.size()); |
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|
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return true; |
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} |
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|
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bool IsoHandlerManager::unregisterStream(IsoStream *stream) |
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{ |
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debugOutput( DEBUG_LEVEL_VERBOSE, "Unregistering stream %p\n",stream); |
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assert(stream); |
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|
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// make sure the stream isn't attached to a handler anymore |
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for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
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it != m_IsoHandlers.end(); |
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++it ) |
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{ |
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if((*it)->isStreamRegistered(stream)) { |
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if(!(*it)->unregisterStream(stream)) { |
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debugOutput( DEBUG_LEVEL_VERBOSE, " could not unregister stream (%p) from handler (%p)...\n",stream,*it); |
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return false; |
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} |
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|
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debugOutput( DEBUG_LEVEL_VERBOSE, " unregistered stream (%p) from handler (%p)...\n",stream,*it); |
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} |
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} |
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|
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// clean up all handlers that aren't used |
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pruneHandlers(); |
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|
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// remove the stream from the registered streams list |
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for ( IsoStreamVectorIterator it = m_IsoStreams.begin(); |
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it != m_IsoStreams.end(); |
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++it ) |
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{ |
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if ( *it == stream ) { |
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m_IsoStreams.erase(it); |
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|
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debugOutput( DEBUG_LEVEL_VERBOSE, " deleted stream (%p) from list...\n", *it); |
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return true; |
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} |
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} |
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|
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return false; //not found |
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448 |
|
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} |
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450 |
|
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451 |
void IsoHandlerManager::pruneHandlers() { |
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452 |
debugOutput( DEBUG_LEVEL_VERBOSE, "enter...\n"); |
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453 |
IsoHandlerVector toUnregister; |
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454 |
|
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// find all handlers that are not in use |
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for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
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457 |
it != m_IsoHandlers.end(); |
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458 |
++it ) |
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459 |
{ |
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460 |
if(!((*it)->inUse())) { |
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461 |
debugOutput( DEBUG_LEVEL_VERBOSE, " handler (%p) not in use\n",*it); |
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462 |
toUnregister.push_back(*it); |
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} |
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464 |
} |
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465 |
// delete them |
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466 |
for ( IsoHandlerVectorIterator it = toUnregister.begin(); |
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467 |
it != toUnregister.end(); |
---|
468 |
++it ) |
---|
469 |
{ |
---|
470 |
unregisterHandler(*it); |
---|
471 |
debugOutput( DEBUG_LEVEL_VERBOSE, " deleting handler (%p)\n",*it); |
---|
472 |
} |
---|
473 |
|
---|
474 |
} |
---|
475 |
|
---|
476 |
bool IsoHandlerManager::startHandlers() { |
---|
477 |
return startHandlers(-1); |
---|
478 |
} |
---|
479 |
|
---|
480 |
bool IsoHandlerManager::startHandlers(int cycle) { |
---|
481 |
debugOutput( DEBUG_LEVEL_VERBOSE, "enter...\n"); |
---|
482 |
|
---|
483 |
for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
---|
484 |
it != m_IsoHandlers.end(); |
---|
485 |
++it ) |
---|
486 |
{ |
---|
487 |
debugOutput( DEBUG_LEVEL_VERBOSE, " starting handler (%p)\n",*it); |
---|
488 |
if(!(*it)->start(cycle)) { |
---|
489 |
debugOutput( DEBUG_LEVEL_VERBOSE, " could not start handler (%p)\n",*it); |
---|
490 |
return false; |
---|
491 |
} |
---|
492 |
} |
---|
493 |
|
---|
494 |
return true; |
---|
495 |
} |
---|
496 |
|
---|
497 |
bool IsoHandlerManager::stopHandlers() { |
---|
498 |
debugOutput( DEBUG_LEVEL_VERBOSE, "enter...\n"); |
---|
499 |
|
---|
500 |
for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
---|
501 |
it != m_IsoHandlers.end(); |
---|
502 |
++it ) |
---|
503 |
{ |
---|
504 |
debugOutput( DEBUG_LEVEL_VERBOSE, " stopping handler (%p)\n",*it); |
---|
505 |
if(!(*it)->stop()){ |
---|
506 |
debugOutput( DEBUG_LEVEL_VERBOSE, " could not stop handler (%p)\n",*it); |
---|
507 |
return false; |
---|
508 |
} |
---|
509 |
} |
---|
510 |
return true; |
---|
511 |
} |
---|
512 |
|
---|
513 |
void IsoHandlerManager::setVerboseLevel(int i) { |
---|
514 |
setDebugLevel(i); |
---|
515 |
|
---|
516 |
for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
---|
517 |
it != m_IsoHandlers.end(); |
---|
518 |
++it ) |
---|
519 |
{ |
---|
520 |
(*it)->setVerboseLevel(i); |
---|
521 |
} |
---|
522 |
} |
---|
523 |
|
---|
524 |
void IsoHandlerManager::dumpInfo() { |
---|
525 |
debugOutputShort( DEBUG_LEVEL_NORMAL, "Dumping IsoHandlerManager Stream handler information...\n"); |
---|
526 |
int i=0; |
---|
527 |
|
---|
528 |
for ( IsoHandlerVectorIterator it = m_IsoHandlers.begin(); |
---|
529 |
it != m_IsoHandlers.end(); |
---|
530 |
++it ) |
---|
531 |
{ |
---|
532 |
debugOutputShort( DEBUG_LEVEL_NORMAL, " Stream %d (%p)\n",i++,*it); |
---|
533 |
|
---|
534 |
(*it)->dumpInfo(); |
---|
535 |
} |
---|
536 |
|
---|
537 |
} |
---|
538 |
|
---|
539 |
} // end of namespace FreebobStreaming |
---|
540 |
|
---|