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strawberry-audio-player-windows-mac-linux
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Code Issues Releases Wiki Activity

simplify CreateElementForMimeType + good practices 

suggestions from gstreamer dev slomo on gst's matrix:
- whole static_pad_templates loop can be avoided with
  gst_element_factory_can_src_any_caps
- ffmpeg elements have been av* prefixed for a while now
- should be looking for Muxer instead of Codec/Muxer,
  Encoder/Audio instead of Codec/Encoder/Audio,
  and there are constants for that
This commit is contained in:
Mikel Pérez 2024-07-11 01:31:51 -06:00 committed by Jonas Kvinge
parent 1c71506f62
commit 8ad560ce0e
2 changed files with 12 additions and 28 deletions
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32
src/transcoder/transcoder.cpp
View File

@ -90,7 +90,7 @@ struct SuitableElement {
};
GstElement *Transcoder::CreateElementForMimeType(const QString &element_type, const QString &mime_type, GstElement *bin) {
GstElement *Transcoder::CreateElementForMimeType(GstElementFactoryListType element_type, const QString &mime_type, GstElement *bin) {
if (mime_type.isEmpty()) return nullptr;
@ -113,32 +113,16 @@ GstElement *Transcoder::CreateElementForMimeType(const QString &element_type, co
GstElementFactory *factory = GST_ELEMENT_FACTORY(f->data);
// Is this the right type of plugin?
if (QString::fromUtf8(gst_element_factory_get_metadata(factory, GST_ELEMENT_METADATA_KLASS)).contains(element_type)) {
const GList *const templates = gst_element_factory_get_static_pad_templates(factory);
for (const GList *t = templates; t; t = g_list_next(t)) {
// Only interested in source pads
GstStaticPadTemplate *pad_template = reinterpret_cast<GstStaticPadTemplate*>(t->data);
if (pad_template->direction != GST_PAD_SRC) continue;
// Does this pad support the mime type we want?
GstCaps *caps = gst_static_pad_template_get_caps(pad_template);
GstCaps *intersection = gst_caps_intersect(caps, target_caps);
gst_caps_unref(caps);
if (intersection) {
if (!gst_caps_is_empty(intersection)) {
int rank = static_cast<int>(gst_plugin_feature_get_rank(GST_PLUGIN_FEATURE(factory)));
if (gst_element_factory_list_is_type(factory, element_type)) {
// check if the element factory supports the target caps
if (gst_element_factory_can_src_any_caps(factory, target_caps)) {
const QString name = QString::fromUtf8(GST_OBJECT_NAME(factory));
if (name.startsWith(QLatin1String("ffmux")) || name.startsWith(QLatin1String("ffenc"))) {
int rank = static_cast<int>(gst_plugin_feature_get_rank(GST_PLUGIN_FEATURE(factory)));
if (name.startsWith(QLatin1String("avmux")) || name.startsWith(QLatin1String("avenc"))) {
rank = -1; // ffmpeg usually sucks
}
suitable_elements_ << SuitableElement(name, rank);
}
gst_caps_unref(intersection);
}
}
}
}
@ -432,8 +416,8 @@ bool Transcoder::StartJob(const Job &job) {
GstElement *decode = CreateElement(QStringLiteral("decodebin"), state->pipeline_);
GstElement *convert = CreateElement(QStringLiteral("audioconvert"), state->pipeline_);
GstElement *resample = CreateElement(QStringLiteral("audioresample"), state->pipeline_);
GstElement *codec = CreateElementForMimeType(QStringLiteral("Codec/Encoder/Audio"), job.preset.codec_mimetype_, state->pipeline_);
GstElement *muxer = CreateElementForMimeType(QStringLiteral("Codec/Muxer"), job.preset.muxer_mimetype_, state->pipeline_);
GstElement *codec = CreateElementForMimeType(GST_ELEMENT_FACTORY_TYPE_AUDIO_ENCODER, job.preset.codec_mimetype_, state->pipeline_);
GstElement *muxer = CreateElementForMimeType(GST_ELEMENT_FACTORY_TYPE_MUXER, job.preset.muxer_mimetype_, state->pipeline_);
GstElement *sink = CreateElement(QStringLiteral("filesink"), state->pipeline_);
if (!src || !decode || !convert || !sink) return false;

2
src/transcoder/transcoder.h
View File

@ -133,7 +133,7 @@ class Transcoder : public QObject {
bool StartJob(const Job &job);
GstElement *CreateElement(const QString &factory_name, GstElement *bin = nullptr, const QString &name = QString());
GstElement *CreateElementForMimeType(const QString &element_type, const QString &mime_type, GstElement *bin = nullptr);
GstElement *CreateElementForMimeType(GstElementFactoryListType element_type, const QString &mime_type, GstElement *bin = nullptr);
void SetElementProperties(const QString &name, GObject *object);
static void NewPadCallback(GstElement*, GstPad *pad, gpointer data);