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PothosToGStreamer.cpp
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PothosToGStreamer.cpp
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/// Copyright (c) 2017-2019 Ashley Brighthope
/// SPDX-License-Identifier: BSL-1.0
#include "PothosToGStreamer.hpp"
#include "GStreamer.hpp"
#include "GStreamerTypes.hpp"
#include <gst/app/gstappsrc.h>
#include <string>
static std::string gstFlowToString(GstFlowReturn gstFlowReturn)
{
return GstTypes::gquarkToString( gst_flow_to_quark( gstFlowReturn ) ).value("unknown");
}
namespace
{
class PothosToGStreamerRunState {
private:
std::unique_ptr< GstAppSrc, GstTypes::GstObjectUnrefFunc > m_gstAppSource;
GstTypes::GstCapsPtr m_baseCaps;
bool m_tagSendAppDataOnce;
std::atomic_bool m_needData;
static void need_data(GstAppSrc * /* src */, guint /* length */, gpointer user_data)
{
auto self = static_cast< PothosToGStreamerRunState* >( user_data );
self->m_needData = true;
}
static void enough_data(GstAppSrc * /* src */, gpointer user_data)
{
auto self = static_cast< PothosToGStreamerRunState* >( user_data );
self->m_needData = false;
}
static gboolean seek_data(GstAppSrc * /* src */, guint64 /* offset */, gpointer /* user_data */)
{
return FALSE;
}
static GstAppSrc* getAppSrcByName(GStreamerSubWorker *gstreamerSubWorker)
{
auto element = gstreamerSubWorker->gstreamerBlock()->getPipelineElementByName( gstreamerSubWorker->name() );
if ( !GST_IS_APP_SRC( element.get() ) )
{
throw Pothos::NullPointerException("PothosToGStreamerRunState::getAppSrcByName", "Could not find a GstAppSrc named \"" + gstreamerSubWorker->name() + "\"");
}
return reinterpret_cast< GstAppSrc* >( element.release() );
}
public:
PothosToGStreamerRunState() = delete;
PothosToGStreamerRunState(const PothosToGStreamerRunState&) = delete;
PothosToGStreamerRunState& operator=(const PothosToGStreamerRunState&) = delete;
PothosToGStreamerRunState(PothosToGStreamerRunState&&) = delete;
PothosToGStreamerRunState& operator=(PothosToGStreamerRunState&&) = delete;
explicit PothosToGStreamerRunState(GStreamerSubWorker *gstreamerSubWorker) :
m_gstAppSource( getAppSrcByName( gstreamerSubWorker ) ),
m_baseCaps( nullptr ),
m_tagSendAppDataOnce( true ),
m_needData( false )
{
// Save the caps if they were set from pipeline
m_baseCaps.reset( gst_app_src_get_caps( m_gstAppSource.get() ) );
GstAppSrcCallbacks gstAppSrcCallbacks{
&need_data,
&enough_data,
&seek_data,
{ }
};
gst_app_src_set_callbacks( m_gstAppSource.get(), &gstAppSrcCallbacks, this, nullptr);
/* Our GstAppSrc can only stream from Pothos, can't seek */
gst_app_src_set_stream_type( m_gstAppSource.get(), GST_APP_STREAM_TYPE_STREAM );
g_object_set( m_gstAppSource.get(),
// "is-live", FALSE,
// "format", GST_FORMAT_TIME,
"block", FALSE, /* We can't block in Pothos work() method */
"do-timestamp", TRUE, /* Get GstAppSrc to time stamp our buffers */
nullptr /* List termination */
);
}
~PothosToGStreamerRunState()
{
// Disconnect callbacks
GstAppSrcCallbacks gstAppSrcCallbacks{
nullptr,
nullptr,
nullptr,
{ }
};
gst_app_src_set_callbacks( m_gstAppSource.get(), &gstAppSrcCallbacks, this, nullptr);
sendEos();
}
bool sendEos()
{
const auto flowReturn = gst_app_src_end_of_stream( gstAppSource() );
if ( flowReturn != GST_FLOW_OK )
{
const auto flowStr = gstFlowToString( flowReturn );
poco_warning( GstTypes::logger(), "PothosToGStreamer::sendEos() flow_return = " + std::to_string( flowReturn ) + " (" + flowStr + ")" );
return false;
}
return true;
}
GstAppSrc *gstAppSource()
{
return m_gstAppSource.get();
}
GstCaps* getBaseCaps()
{
return m_baseCaps.get();
}
bool needData() const
{
return m_needData.load();
}
bool tagSendAppDataOnce()
{
if ( m_tagSendAppDataOnce )
{
m_tagSendAppDataOnce = false;
return true;
}
return false;
}
bool sendEvent(GstEvent *event)
{
return gst_element_send_event( GST_ELEMENT( gstAppSource() ), event) == TRUE;
}
}; // class PothosToGStreamerRunState
#define check_run_state_ptr() do { \
if ( !m_runState.get() ) throw Pothos::NullPointerException("Not in running state: " + this->gstreamerBlock()->getPipelineString(), std::string( __func__ ) ); \
} while ( false )
class PothosToGStreamerImpl : public GStreamerSubWorker
{
private:
Pothos::InputPort *m_pothosInputPort;
std::shared_ptr< std::string > m_tag_app_data;
std::unique_ptr< PothosToGStreamerRunState > m_runState;
public:
PothosToGStreamerImpl(const PothosToGStreamerImpl&) = delete; // No copy constructor
PothosToGStreamerImpl& operator= (const PothosToGStreamerImpl&) = delete; // No assignment operator
PothosToGStreamerImpl(GStreamer* gstreamerBlock, GstAppSrc* gstAppSource) :
GStreamerSubWorker( gstreamerBlock, GstTypes::gcharToString( GstTypes::GCharPtr( gst_element_get_name( gstAppSource ) ).get() ).value() ),
m_pothosInputPort( gstreamerBlock->setupInput( name() ) ), // Allocate Pothos input port for GStreamer
m_tag_app_data( std::make_shared< std::string >() ),
m_runState()
{
// Register Callable and Probe
{
const auto funcGetterName = this->funcName( "getCurrentLevelBytes" );
gstreamerBlock->registerCallable(
funcGetterName,
Pothos::Callable(&PothosToGStreamerImpl::getCurrentLevelBytes).bind( std::ref( *this ), 0)
);
gstreamerBlock->registerProbe( funcGetterName );
}
// Register sendEos Callable and Slot
{
const auto sendEosName = this->funcName( "sendEos" );
gstreamerBlock->registerCallable(
sendEosName,
Pothos::Callable(&PothosToGStreamerImpl::sendEos).bind( std::ref( *this ), 0)
);
// registerCallable does not register our slot since this method takes no arguments
gstreamerBlock->registerSlot( sendEosName );
}
}
~PothosToGStreamerImpl() override = default;
const std::string& getTagAppData() const
{
return *m_tag_app_data;
}
void setTagAppData(const std::string& tag_app_data)
{
*m_tag_app_data = tag_app_data;
}
void activate() override
{
// Get current instance of GStreamer app source
m_runState.reset( new PothosToGStreamerRunState( this ) );
}
void deactivate() override
{
m_runState.reset();
}
bool sendGstreamerAppTags()
{
GstTagList *gstTagList = gst_tag_list_new(
GST_TAG_APPLICATION_NAME, "Pothos",
nullptr
);
// If we have a string for GST_TAG_APPLICATION_DATA lets convert it and send it
if ( !m_tag_app_data->empty() )
{
auto gstBuffer = GstTypes::makeSharedGstBuffer(m_tag_app_data->data(), m_tag_app_data->length(), m_tag_app_data);
GstCaps *caps = gst_caps_from_string( "text/plain" );
GstSegment *segment = gst_segment_new();
GstStructure *info = gst_structure_new_empty( GST_TAG_APPLICATION_DATA );
GstSample *sample = gst_sample_new(
gstBuffer.release(),
caps,
segment,
info
);
GstTypes::GVal value( GST_TYPE_SAMPLE );
g_value_set_boxed( value(), sample );
gst_tag_list_add_value(
gstTagList,
GST_TAG_MERGE_APPEND,
GST_TAG_APPLICATION_DATA, value()
);
}
GstEvent *event = gst_event_new_tag( gstTagList );
return m_runState->sendEvent( event );
}
bool sendToGStreamer(const Pothos::Packet &packet)
{
const std::string funcName( "PothosToGStreamer::sendToGStreamer" );
// Try to push a GStreamer tag on first buffer push
if ( m_runState->tagSendAppDataOnce() )
{
sendGstreamerAppTags();
}
// If GStreamer AppSrc is full bail
if ( m_runState->needData() == false )
{
return false;
}
auto gstBuffer = GstTypes::makeGstBufferFromPacket( packet );
// If GstBuffer could not be allocated, bail
if ( !gstBuffer )
{
return false;
}
// Add caps if any to GStreamer buffer
{
auto caps_it = packet.metadata.find( GstTypes::PACKET_META_CAPS );
if ( ( caps_it != packet.metadata.end() ) &&
( caps_it->second.type() == typeid(std::string) ) )
{
const auto & caps = caps_it->second.extract< std::string >();
if ( GstTypes::debug_extra )
{
poco_information( GstTypes::logger(), funcName + " We got caps in the metadata: " + caps );
}
auto gstCaps = gst_caps_from_string( caps.c_str() );
// If pothos packet has GStreamer caps add it to next GstBuffer push
if (gstCaps != nullptr)
{
gst_app_src_set_caps( m_runState->gstAppSource(), gstCaps );
gst_caps_unref( gstCaps );
}
}
else
{
gst_app_src_set_caps( m_runState->gstAppSource(), m_runState->getBaseCaps() );
}
}
const auto flowReturn = gst_app_src_push_buffer( m_runState->gstAppSource(), gstBuffer.release() );
if ( flowReturn != GST_FLOW_OK )
{
const auto flowStr = gstFlowToString( flowReturn );
poco_warning( GstTypes::logger(), funcName + " flow_return = " + std::to_string( flowReturn ) + " (" + flowStr + ")" );
}
// Check if packet has EOS flags and if its set
if ( GstTypes::ifKeyExtract< bool >( packet.metadata, GstTypes::PACKET_META_EOS ).value( false ) )
{
sendEos();
}
return ( flowReturn >= 0 );
}
void work(long long /* maxTimeoutNs */) override
{
if ( !m_pothosInputPort->hasMessage() )
{
return;
}
auto message = m_pothosInputPort->peekMessage();
if ( message.type() == typeid( Pothos::Packet ) )
{
const auto &packet = message.extract< Pothos::Packet >();
if ( sendToGStreamer( packet ) )
{
m_pothosInputPort->popMessage();
}
return;
}
poco_warning( GstTypes::logger(), "Received message on port "+m_pothosInputPort->name()+" of type we can't handle. Only accept Pothos::Packet" );
m_pothosInputPort->popMessage();
}
void sendEos()
{
check_run_state_ptr();
m_runState->sendEos();
}
guint64 getCurrentLevelBytes() const
{
check_run_state_ptr();
return gst_app_src_get_current_level_bytes( m_runState->gstAppSource() );
}
}; // class PothosToGStreamerImpl
} // namespace
std::unique_ptr< GStreamerSubWorker > PothosToGStreamer::makeIfType(GStreamer* gstreamerBlock, GstElement* gstElement)
{
if ( GST_IS_APP_SRC( gstElement ) )
{
return std::unique_ptr< GStreamerSubWorker >(
new PothosToGStreamerImpl(
gstreamerBlock,
reinterpret_cast< GstAppSrc* >( gstElement )
)
);
}
return nullptr;
}