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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#include "FFMpegDemuxer.h"
#include "../base/ScopeTimer.h"
#include "../base/ObjectCounter.h"
#include "../base/Exception.h"
#include "../base/Logger.h"
#include <cstring>
#include <iostream>
using namespace std;
namespace avg {
FFMpegDemuxer::FFMpegDemuxer(AVFormatContext * pFormatContext, vector<int> streamIndexes)
: m_pFormatContext(pFormatContext)
{
ObjectCounter::get()->incRef(&typeid(*this));
for (unsigned i = 0; i < streamIndexes.size(); ++i) {
m_PacketLists[streamIndexes[i]] = PacketList();
}
}
FFMpegDemuxer::~FFMpegDemuxer()
{
clearPacketCache();
ObjectCounter::get()->decRef(&typeid(*this));
}
AVPacket * FFMpegDemuxer::getPacket(int streamIndex)
{
// Make sure enableStream was called on streamIndex.
AVG_ASSERT(m_PacketLists.size() > 0);
AVG_ASSERT(streamIndex > -1 && streamIndex < 10);
if (m_PacketLists.find(streamIndex) == m_PacketLists.end()) {
cerr << this << ": getPacket: Stream " << streamIndex << " not found." << endl;
dump();
AVG_ASSERT(false);
}
PacketList& curPacketList = m_PacketLists.find(streamIndex)->second;
AVPacket* pPacket;
if (!curPacketList.empty()) {
// The stream has packets queued already.
pPacket = curPacketList.front();
curPacketList.pop_front();
} else {
// No packets queued for this stream -> read and queue packets until we get one
// that is meant for this stream.
do {
pPacket = new AVPacket;
memset(pPacket, 0, sizeof(AVPacket));
int err = av_read_frame(m_pFormatContext, pPacket);
if (err < 0) {
// EOF or error
#if LIBAVUTIL_VERSION_MAJOR > 50
if (err != int(AVERROR_EOF)) {
char sz[256];
av_strerror(err, sz, 256);
AVG_TRACE(Logger::category::PLAYER, Logger::severity::ERROR,
"Error decoding video: " << sz);
}
#endif
av_free_packet(pPacket);
delete pPacket;
pPacket = 0;
return 0;
}
if (pPacket->stream_index != streamIndex) {
if (m_PacketLists.find(pPacket->stream_index) != m_PacketLists.end()) {
// Relevant stream, but not ours
av_dup_packet(pPacket);
PacketList& otherPacketList =
m_PacketLists.find(pPacket->stream_index)->second;
otherPacketList.push_back(pPacket);
} else {
// Disabled stream
av_free_packet(pPacket);
delete pPacket;
pPacket = 0;
}
} else {
// Our stream
av_dup_packet(pPacket);
}
} while (!pPacket || pPacket->stream_index != streamIndex);
}
return pPacket;
}
void FFMpegDemuxer::seek(float destTime)
{
#if LIBAVFORMAT_BUILD <= 4616
av_seek_frame(m_pFormatContext, -1, destTime*1000000);
#else
#if LIBAVFORMAT_BUILD < ((49<<16)+(0<<8)+0)
av_seek_frame(m_pFormatContext, -1, destTime*1000000, 0);
#else
av_seek_frame(m_pFormatContext, -1, (long long)(destTime*AV_TIME_BASE),
AVSEEK_FLAG_BACKWARD);
#endif
#endif
clearPacketCache();
}
void FFMpegDemuxer::clearPacketCache()
{
map<int, PacketList>::iterator it;
for (it = m_PacketLists.begin(); it != m_PacketLists.end(); ++it) {
PacketList::iterator it2;
PacketList* pPacketList = &(it->second);
for (it2 = pPacketList->begin(); it2 != pPacketList->end(); ++it2) {
av_free_packet(*it2);
delete *it2;
}
pPacketList->clear();
}
}
void FFMpegDemuxer::dump()
{
map<int, PacketList>::iterator it;
cerr << "FFMpegDemuxer " << this << endl;
cerr << "packetlists.size(): " << int(m_PacketLists.size()) << endl;
for (it = m_PacketLists.begin(); it != m_PacketLists.end(); ++it) {
cerr << " " << it->first << ": " << int(it->second.size()) << endl;
}
}
}
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