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pngenc: output one frame only in snapshot mode

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In snapshot mode pngenc should output exactly one frame
and then return FLOW_EOS to upstream. If upstream sends
more input frames before shutting down, it should keep
returning FLOW_EOS but not output any more encoded frames.

After a flushing seek it should output frames again though.

Fixes #3069.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5546>
This commit is contained in:
Tim-Philipp Müller 2023-10-24 18:12:44 +01:00 committed by GStreamer Marge Bot
parent 7fd7917c78
commit d69885e0f7
2 changed files with 19 additions and 1 deletions
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18
subprojects/gst-plugins-good/ext/libpng/gstpngenc.c
View file

@ -86,6 +86,7 @@ static GstFlowReturn gst_pngenc_handle_frame (GstVideoEncoder * encoder,
GstVideoCodecFrame * frame);
static gboolean gst_pngenc_set_format (GstVideoEncoder * encoder,
GstVideoCodecState * state);
static gboolean gst_pngenc_flush (GstVideoEncoder * encoder);
static gboolean gst_pngenc_propose_allocation (GstVideoEncoder * encoder,
GstQuery * query);
@ -143,6 +144,7 @@ gst_pngenc_class_init (GstPngEncClass * klass)
venc_class->set_format = gst_pngenc_set_format;
venc_class->handle_frame = gst_pngenc_handle_frame;
venc_class->propose_allocation = gst_pngenc_propose_allocation;
venc_class->flush = gst_pngenc_flush;
gobject_class->finalize = gst_pngenc_finalize;
GST_DEBUG_CATEGORY_INIT (pngenc_debug, "pngenc", 0, "PNG image encoder");
@ -310,6 +312,16 @@ user_write_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
pngenc->output_mem_pos += length;
}
static gboolean
gst_pngenc_flush (GstVideoEncoder * encoder)
{
GstPngEnc *pngenc = GST_PNGENC (encoder);
pngenc->frame_count = 0;
return TRUE;
}
static GstFlowReturn
gst_pngenc_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame)
{
@ -323,6 +335,10 @@ gst_pngenc_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame)
GstBuffer *outbuf;
pngenc = GST_PNGENC (encoder);
if (pngenc->snapshot && pngenc->frame_count > 0)
return GST_FLOW_EOS;
info = &pngenc->input_state->info;
GST_DEBUG_OBJECT (pngenc, "BEGINNING");
@ -408,6 +424,8 @@ gst_pngenc_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame)
if ((ret = gst_video_encoder_finish_frame (encoder, frame)) != GST_FLOW_OK)
goto done;
++pngenc->frame_count;
if (pngenc->snapshot)
ret = GST_FLOW_EOS;

2
subprojects/gst-plugins-good/ext/libpng/gstpngenc.h
View file

@ -50,7 +50,7 @@ struct _GstPngEnc
guint compression_level;
gboolean snapshot;
gboolean newmedia;
guint frame_count;
};
GST_ELEMENT_REGISTER_DECLARE (pngenc);