FGFS-4.1/OpenSceneGraph
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From Wang Rui, "additional FFmpegParameters class in the ffmpeg plugin for setting parameters before opening the video file, which benefits from getPluginStringData() as shown in the ReaderWriter implementation.

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Now we can use ffmpeg to render webcam video (using the vfwcap device) under Windows:

osgmovie 0 -e ffmpeg -O "format=vfwcap frame_rate=25"

The number 0 just indicates a default device number in ffmpeg.

I think this can work under Linux, too, and should be a bit better than comparing the filename with a '/dev/' string. Just type:

./osgmovie /dev/yourcam -e ffmpeg -O "format=video4linux2 frame_rate=30 size=320x240""
This commit is contained in:
Robert Osfield
2010-11-03 10:37:32 +00:00
parent afa563df57
commit 4ced7dffc4
8 changed files with 168 additions and 11 deletions
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38
src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp
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@@ -13,6 +13,7 @@
#include "FFmpegHeaders.hpp"
#include "FFmpegImageStream.hpp"
#include "FFmpegParameters.hpp"
#include <osgDB/Registry>
#include <osgDB/FileNameUtils>
@@ -49,6 +50,12 @@ public:
supportsExtension("sav", "MPEG-4");
supportsExtension("3gp", "MPEG-4");
supportsExtension("sdp", "MPEG-4");
supportsOption("format", "Force setting input format (e.g. vfwcap for Windows webcam)");
supportsOption("pixel_format", "Set pixel format");
supportsOption("frame_size", "Set frame size (e.g. 320x240)");
supportsOption("frame_rate", "Set frame rate (e.g. 25)");
supportsOption("audio_sample_rate", "Set audio sampling rate (e.g. 44100)");
#ifdef USE_AV_LOCK_MANAGER
// enable thread locking
@@ -75,9 +82,16 @@ public:
if (filename.compare(0, 5, "/dev/")==0)
{
return readImageStream(filename, options);
return readImageStream(filename, NULL);
}
osg::ref_ptr<osgFFmpeg::FFmpegParameters> parameters(new osgFFmpeg::FFmpegParameters);
parseOptions(parameters.get(), options);
if (parameters->isFormatAvailable())
{
return readImageStream(filename, parameters.get());
}
if (! acceptsExtension(ext))
return ReadResult::FILE_NOT_HANDLED;
@@ -88,22 +102,36 @@ public:
if (path.empty())
return ReadResult::FILE_NOT_FOUND;
return readImageStream(path, options);
return readImageStream(path, parameters.get());
}
ReadResult readImageStream(const std::string& filename, const osgDB::ReaderWriter::Options * options) const
ReadResult readImageStream(const std::string& filename, osgFFmpeg::FFmpegParameters* parameters) const
{
OSG_INFO << "ReaderWriterFFmpeg::readImage " << filename << std::endl;
osg::ref_ptr<osgFFmpeg::FFmpegImageStream> image_stream(new osgFFmpeg::FFmpegImageStream);
if (! image_stream->open(filename))
if (! image_stream->open(filename, parameters))
return ReadResult::FILE_NOT_HANDLED;
return image_stream.release();
}
private:
void parseOptions(osgFFmpeg::FFmpegParameters* parameters, const osgDB::ReaderWriter::Options * options) const
{
if (options && options->getNumPluginStringData()>0)
{
const FormatDescriptionMap& supportedOptList = supportedOptions();
for (FormatDescriptionMap::const_iterator itr = supportedOptList.begin();
itr != supportedOptList.end(); ++itr)
{
const std::string& name = itr->first;
parameters->parse(name, options->getPluginStringData(name));
}
}
}
#ifdef USE_AV_LOCK_MANAGER
static int lockMgr(void **mutex, enum AVLockOp op)