gboolean GstEnginePipeline::BusCallback(GstBus*, GstMessage* msg,
gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
qLog(Debug) << instance->id() << "bus message" << GST_MESSAGE_TYPE_NAME(msg);
switch (GST_MESSAGE_TYPE(msg)) {
case GST_MESSAGE_ERROR:
instance->ErrorMessageReceived(msg);
break;
case GST_MESSAGE_TAG:
instance->TagMessageReceived(msg);
break;
case GST_MESSAGE_STATE_CHANGED:
instance->StateChangedMessageReceived(msg);
break;
default:
break;
}
return FALSE;
}
bool GstEnginePipeline::EventHandoffCallback(GstPad*, GstEvent* e,
gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
qLog(Debug) << instance->id() << "event" << GST_EVENT_TYPE_NAME(e);
if (GST_EVENT_TYPE(e) == GST_EVENT_NEWSEGMENT &&
!instance->segment_start_received_) {
// The segment start time is used to calculate the proper offset of data
// buffers from the start of the stream
gint64 start = 0;
gst_event_parse_new_segment(e, nullptr, nullptr, nullptr, &start, nullptr,
nullptr);
instance->segment_start_ = start;
instance->segment_start_received_ = true;
if (instance->emit_track_ended_on_segment_start_) {
qLog(Debug) << "New segment started, EOS will signal on next buffer "
"discontinuity";
instance->emit_track_ended_on_segment_start_ = false;
instance->emit_track_ended_on_time_discontinuity_ = true;
}
}
return true;
}
GstPadProbeReturn GstEnginePipeline::EventHandoffCallback(GstPad*,
GstPadProbeInfo* info,
gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
GstEvent* e = gst_pad_probe_info_get_event(info);
qLog(Debug) << instance->id() << "event" << GST_EVENT_TYPE_NAME(e);
if (GST_EVENT_TYPE(e) == GST_EVENT_SEGMENT &&
!instance->segment_start_received_) {
// The segment start time is used to calculate the proper offset of data
// buffers from the start of the stream
const GstSegment* segment = nullptr;
gst_event_parse_segment(e, &segment);
instance->segment_start_ = segment->start;
instance->segment_start_received_ = true;
if (instance->emit_track_ended_on_segment_start_) {
qLog(Debug) << "New segment started, EOS will signal on next buffer "
"discontinuity";
instance->emit_track_ended_on_segment_start_ = false;
instance->emit_track_ended_on_time_discontinuity_ = true;
}
}
return GST_PAD_PROBE_OK;
}
void GstEnginePipeline::SourceSetupCallback(GstURIDecodeBin* bin,
GParamSpec* pspec, gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
GstElement* element;
g_object_get(bin, "source", &element, nullptr);
if (!element) {
return;
}
if (g_object_class_find_property(G_OBJECT_GET_CLASS(element), "device") &&
!instance->source_device().isEmpty()) {
// Gstreamer is not able to handle device in URL (refering to Gstreamer
// documentation, this might be added in the future). Despite that, for now
// we include device inside URL: we decompose it during Init and set device
// here, when this callback is called.
g_object_set(element, "device",
instance->source_device().toLocal8Bit().constData(), nullptr);
}
if (g_object_class_find_property(G_OBJECT_GET_CLASS(element), "user-agent")) {
QString user_agent =
QString("%1 %2").arg(QCoreApplication::applicationName(),
QCoreApplication::applicationVersion());
g_object_set(element, "user-agent", user_agent.toUtf8().constData(),
nullptr);
#ifdef Q_OS_DARWIN
g_object_set(element, "tls-database", instance->engine_->tls_database(),
nullptr);
g_object_set(element, "ssl-use-system-ca-file", false, nullptr);
g_object_set(element, "ssl-strict", TRUE, nullptr);
#endif
}
}
GstPadProbeReturn GstEnginePipeline::EventHandoffCallback(GstPad*,
GstPadProbeInfo* info,
gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
GstEvent* e = gst_pad_probe_info_get_event(info);
qLog(Debug) << instance->id() << "event" << GST_EVENT_TYPE_NAME(e);
switch (GST_EVENT_TYPE(e)) {
case GST_EVENT_SEGMENT:
if (!instance->segment_start_received_) {
// The segment start time is used to calculate the proper offset of data
// buffers from the start of the stream
const GstSegment* segment = nullptr;
gst_event_parse_segment(e, &segment);
instance->segment_start_ = segment->start;
instance->segment_start_received_ = true;
}
break;
default:
break;
}
return GST_PAD_PROBE_OK;
}
void GstEnginePipeline::SourceDrainedCallback(GstURIDecodeBin* bin,
gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
if (instance->has_next_valid_url()) {
instance->TransitionToNext();
}
}
bool GstEnginePipeline::HandoffCallback(GstPad*, GstBuffer* buf, gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
QList<BufferConsumer*> consumers;
{
QMutexLocker l(&instance->buffer_consumers_mutex_);
consumers = instance->buffer_consumers_;
}
foreach (BufferConsumer* consumer, consumers) {
gst_buffer_ref(buf);
consumer->ConsumeBuffer(buf, instance->id());
}
GstBusSyncReply GstEnginePipeline::BusCallbackSync(GstBus*, GstMessage* msg,
gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
qLog(Debug) << instance->id() << "sync bus message"
<< GST_MESSAGE_TYPE_NAME(msg);
switch (GST_MESSAGE_TYPE(msg)) {
case GST_MESSAGE_EOS:
emit instance->EndOfStreamReached(instance->id(), false);
break;
case GST_MESSAGE_TAG:
instance->TagMessageReceived(msg);
break;
case GST_MESSAGE_ERROR:
instance->ErrorMessageReceived(msg);
break;
case GST_MESSAGE_ELEMENT:
instance->ElementMessageReceived(msg);
break;
case GST_MESSAGE_STATE_CHANGED:
instance->StateChangedMessageReceived(msg);
break;
case GST_MESSAGE_BUFFERING:
instance->BufferingMessageReceived(msg);
break;
case GST_MESSAGE_STREAM_STATUS:
instance->StreamStatusMessageReceived(msg);
break;
case GST_MESSAGE_STREAM_START:
if (instance->emit_track_ended_on_stream_start_) {
qLog(Debug) << "New segment started, EOS will signal on next buffer "
"discontinuity";
instance->emit_track_ended_on_stream_start_ = false;
instance->emit_track_ended_on_time_discontinuity_ = true;
}
break;
default:
break;
}
return GST_BUS_PASS;
}
void GstEnginePipeline::SourceDrainedCallback(GstURIDecodeBin* bin,
gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
if (instance->has_next_valid_url() &&
// I'm not sure why, but calling this when previous track is a local song
// and the next track is a Spotify song is buggy: the Spotify song will
// not start or with some offset. So just do nothing here: when the song
// finished, EndOfStreamReached/TrackEnded will be emitted anyway so
// NextItem will be called.
!(instance->url_.scheme() != "spotify" &&
instance->next_url_.scheme() == "spotify")) {
instance->TransitionToNext();
}
}
void GstEnginePipeline::NewPadCallback(GstElement*, GstPad* pad, gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
GstPad* const audiopad = gst_element_get_pad(instance->audiobin_, "sink");
if (GST_PAD_IS_LINKED(audiopad)) {
qLog(Warning) << instance->id() << "audiopad is already linked, unlinking old pad";
gst_pad_unlink(audiopad, GST_PAD_PEER(audiopad));
}
gst_pad_link(pad, audiopad);
gst_object_unref(audiopad);
instance->pipeline_is_connected_ = true;
if (instance->pending_seek_nanosec_ != -1 && instance->pipeline_is_initialised_) {
QMetaObject::invokeMethod(instance, "Seek", Qt::QueuedConnection,
Q_ARG(qint64, instance->pending_seek_nanosec_));
}
}
GstBusSyncReply GstEnginePipeline::BusCallbackSync(GstBus*, GstMessage* msg,
gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
qLog(Debug) << instance->id() << "sync bus message"
<< GST_MESSAGE_TYPE_NAME(msg);
switch (GST_MESSAGE_TYPE(msg)) {
case GST_MESSAGE_EOS:
emit instance->EndOfStreamReached(instance->id(), false);
break;
case GST_MESSAGE_TAG:
instance->TagMessageReceived(msg);
break;
case GST_MESSAGE_ERROR:
instance->ErrorMessageReceived(msg);
break;
case GST_MESSAGE_ELEMENT:
instance->ElementMessageReceived(msg);
break;
case GST_MESSAGE_STATE_CHANGED:
instance->StateChangedMessageReceived(msg);
break;
case GST_MESSAGE_BUFFERING:
instance->BufferingMessageReceived(msg);
break;
case GST_MESSAGE_STREAM_STATUS:
instance->StreamStatusMessageReceived(msg);
break;
default:
break;
}
return GST_BUS_PASS;
}
void GstEnginePipeline::SourceSetupCallback(GstURIDecodeBin* bin,
GParamSpec* pspec, gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
GstElement* element;
g_object_get(bin, "source", &element, nullptr);
if (!element) {
return;
}
if (g_object_class_find_property(G_OBJECT_GET_CLASS(element), "device") &&
!instance->source_device().isEmpty()) {
// Gstreamer is not able to handle device in URL (refering to Gstreamer
// documentation, this might be added in the future). Despite that, for now
// we include device inside URL: we decompose it during Init and set device
// here, when this callback is called.
g_object_set(element, "device",
instance->source_device().toLocal8Bit().constData(), nullptr);
}
if (g_object_class_find_property(G_OBJECT_GET_CLASS(element),
"extra-headers") &&
instance->url().host().contains("grooveshark")) {
// Grooveshark streaming servers will answer with a 400 error 'Bad request'
// if we don't specify 'Range' field in HTTP header.
// Maybe it could be useful in some other cases, but for now, I prefer to
// keep this grooveshark specific.
GstStructure* headers;
headers = gst_structure_new("extra-headers", "Range", G_TYPE_STRING,
"bytes=0-", nullptr);
g_object_set(element, "extra-headers", headers, nullptr);
gst_structure_free(headers);
}
if (g_object_class_find_property(G_OBJECT_GET_CLASS(element), "user-agent")) {
QString user_agent =
QString("%1 %2").arg(QCoreApplication::applicationName(),
QCoreApplication::applicationVersion());
g_object_set(element, "user-agent", user_agent.toUtf8().constData(),
nullptr);
}
}
void GstEnginePipeline::NewPadCallback(GstElement*, GstPad* pad,
gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
GstPad* const audiopad =
gst_element_get_static_pad(instance->audiobin_, "sink");
// Link decodebin's sink pad to audiobin's src pad.
if (GST_PAD_IS_LINKED(audiopad)) {
qLog(Warning) << instance->id()
<< "audiopad is already linked, unlinking old pad";
gst_pad_unlink(audiopad, GST_PAD_PEER(audiopad));
}
gst_pad_link(pad, audiopad);
gst_object_unref(audiopad);
// Offset the timestamps on all the buffers coming out of the decodebin so
// they line up exactly with the end of the last buffer from the old
// decodebin.
// "Running time" is the time since the last flushing seek.
GstClockTime running_time = gst_segment_to_running_time(
&instance->last_decodebin_segment_, GST_FORMAT_TIME,
instance->last_decodebin_segment_.position);
gst_pad_set_offset(pad, running_time);
// Add a probe to the pad so we can update last_decodebin_segment_.
gst_pad_add_probe(
pad, static_cast<GstPadProbeType>(GST_PAD_PROBE_TYPE_BUFFER |
GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM |
GST_PAD_PROBE_TYPE_EVENT_FLUSH),
DecodebinProbe, instance, nullptr);
instance->pipeline_is_connected_ = true;
if (instance->pending_seek_nanosec_ != -1 &&
instance->pipeline_is_initialised_) {
QMetaObject::invokeMethod(instance, "Seek", Qt::QueuedConnection,
Q_ARG(qint64, instance->pending_seek_nanosec_));
}
}
bool GstEnginePipeline::HandoffCallback(GstPad*, GstBuffer* buf,
gpointer self) {
GstEnginePipeline* instance = reinterpret_cast<GstEnginePipeline*>(self);
QList<BufferConsumer*> consumers;
{
QMutexLocker l(&instance->buffer_consumers_mutex_);
consumers = instance->buffer_consumers_;
}
for (BufferConsumer* consumer : consumers) {
gst_buffer_ref(buf);
consumer->ConsumeBuffer(buf, instance->id());
}
// Calculate the end time of this buffer so we can stop playback if it's
// after the end time of this song.
if (instance->end_offset_nanosec_ > 0) {
quint64 start_time = GST_BUFFER_TIMESTAMP(buf) - instance->segment_start_;
quint64 duration = GST_BUFFER_DURATION(buf);
quint64 end_time = start_time + duration;
if (end_time > instance->end_offset_nanosec_) {
if (instance->has_next_valid_url()) {
if (instance->next_url_ == instance->url_ &&
instance->next_beginning_offset_nanosec_ ==
instance->end_offset_nanosec_) {
// The "next" song is actually the next segment of this file - so
// cheat and keep on playing, but just tell the Engine we've moved on.
instance->end_offset_nanosec_ = instance->next_end_offset_nanosec_;
instance->next_url_ = QUrl();
instance->next_beginning_offset_nanosec_ = 0;
instance->next_end_offset_nanosec_ = 0;
// GstEngine will try to seek to the start of the new section, but
// we're already there so ignore it.
instance->ignore_next_seek_ = true;
emit instance->EndOfStreamReached(instance->id(), true);
} else {
// We have a next song but we can't cheat, so move to it normally.
instance->TransitionToNext();
}
} else {
// There's no next song
emit instance->EndOfStreamReached(instance->id(), false);
}
}
}
if (instance->emit_track_ended_on_time_discontinuity_) {
if (GST_BUFFER_FLAG_IS_SET(buf, GST_BUFFER_FLAG_DISCONT) ||
GST_BUFFER_OFFSET(buf) < instance->last_buffer_offset_) {
qLog(Debug) << "Buffer discontinuity - emitting EOS";
instance->emit_track_ended_on_time_discontinuity_ = false;
emit instance->EndOfStreamReached(instance->id(), true);
}
}
instance->last_buffer_offset_ = GST_BUFFER_OFFSET(buf);
return true;
}
