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Copy pathInputStream.cpp
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145 lines (119 loc) · 3.87 KB
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Copy pathInputStream.cpp
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145 lines (119 loc) · 3.87 KB
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#include "InputStream.hpp"
#include <AvTranscoder/file/InputFile.hpp>
extern "C" {
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
}
#include <stdexcept>
#include <cassert>
namespace avtranscoder
{
InputStream::InputStream(InputFile& inputFile, const size_t streamIndex)
: IInputStream()
, _inputFile(&inputFile)
, _codec(NULL)
, _streamCache()
, _streamIndex(streamIndex)
, _isActivated(false)
{
AVStream& avStream = _inputFile->getFormatContext().getAVStream(_streamIndex);
AVCodecParameters* codecParameters = avStream.codecpar;
const AVCodec* codec = avcodec_find_decoder(codecParameters->codec_id);
AVCodecContext* context = avcodec_alloc_context3(codec);
int ret = avcodec_parameters_to_context(context, codecParameters);
context->time_base = avStream.time_base;
if (ret < 0)
throw std::runtime_error("Failed to copy decoder parameters to input stream context");
switch(context->codec_type)
{
case AVMEDIA_TYPE_VIDEO:
{
_codec = new VideoCodec(eCodecTypeDecoder, *context);
break;
}
case AVMEDIA_TYPE_AUDIO:
{
_codec = new AudioCodec(eCodecTypeDecoder, *context);
break;
}
case AVMEDIA_TYPE_DATA:
{
_codec = new DataCodec(eCodecTypeDecoder, *context);
break;
}
default:
break;
}
}
InputStream::~InputStream()
{
delete _codec;
}
bool InputStream::readNextPacket(CodedData& data)
{
if(!_isActivated)
throw std::runtime_error("Can't read packet on non-activated input stream.");
// if packet is already cached
if(!_streamCache.empty())
{
LOG_DEBUG("Get packet of '" << _inputFile->getFilename() << "' (stream " << _streamIndex << ") from the cache")
data.copyData(_streamCache.front().getData(), _streamCache.front().getSize());
_streamCache.pop();
}
// else read next packet
else
{
LOG_DEBUG("Read next packet of '" << _inputFile->getFilename() << "' (stream " << _streamIndex << ")")
return _inputFile->readNextPacket(data, _streamIndex) && _streamCache.empty();
}
return true;
}
VideoCodec& InputStream::getVideoCodec()
{
assert(_streamIndex <= _inputFile->getFormatContext().getNbStreams());
if(getProperties().getStreamType() != AVMEDIA_TYPE_VIDEO)
{
throw std::runtime_error("unable to get video descriptor on non-video stream");
}
return *static_cast<VideoCodec*>(_codec);
}
AudioCodec& InputStream::getAudioCodec()
{
assert(_streamIndex <= _inputFile->getFormatContext().getNbStreams());
if(getProperties().getStreamType() != AVMEDIA_TYPE_AUDIO)
{
throw std::runtime_error("unable to get audio descriptor on non-audio stream");
}
return *static_cast<AudioCodec*>(_codec);
}
DataCodec& InputStream::getDataCodec()
{
assert(_streamIndex <= _inputFile->getFormatContext().getNbStreams());
if(getProperties().getStreamType() != AVMEDIA_TYPE_DATA)
{
throw std::runtime_error("unable to get data descriptor on non-data stream");
}
return *static_cast<DataCodec*>(_codec);
}
const StreamProperties& InputStream::getProperties() const
{
return _inputFile->getProperties().getStreamPropertiesWithIndex(_streamIndex);
}
void InputStream::addPacket(const AVPacket& packet)
{
// Do not cache data if the stream is declared as unused in process
if(!_isActivated)
{
LOG_DEBUG("Do not add a packet data for the stream " << _streamIndex << " to the cache: stream not activated")
return;
}
LOG_DEBUG("Add a packet data for the stream " << _streamIndex << " to the cache");
CodedData codedData;
codedData.copyData(packet.data, packet.size);
_streamCache.push(codedData);
}
void InputStream::clearBuffering()
{
_streamCache = std::queue<CodedData>();
}
}