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jpegenc: add snapshot property

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Like pngenc, automatically send an EOS message.

Example of bin:
appsrc ! jpegenc snapshot=true ! filesink location=out.jpg

This is especially useful for limited/slow hardware.

Otherwise calling gst_video_convert_sample() is a better option
(internally uses videoconvert and videoscale).

https://bugzilla.gnome.org/show_bug.cgi?id=755453
This commit is contained in:
Matthieu Crapet 2015-09-23 10:01:32 +02:00 committed by Tim-Philipp Müller
parent cbb9c31228
commit ba86a1d99c
2 changed files with 24 additions and 2 deletions
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25
ext/jpeg/gstjpegenc.c
View file

@ -54,6 +54,7 @@ GST_DEBUG_CATEGORY_STATIC (jpegenc_debug);
#define JPEG_DEFAULT_QUALITY 85
#define JPEG_DEFAULT_SMOOTHING 0
#define JPEG_DEFAULT_IDCT_METHOD JDCT_FASTEST
#define JPEG_DEFAULT_SNAPSHOT FALSE
/* JpegEnc signals and args */
enum
@ -67,7 +68,8 @@ enum
PROP_0,
PROP_QUALITY,
PROP_SMOOTHING,
PROP_IDCT_METHOD
PROP_IDCT_METHOD,
PROP_SNAPSHOT
};
static void gst_jpegenc_finalize (GObject * object);
@ -150,11 +152,23 @@ gst_jpegenc_class_init (GstJpegEncClass * klass)
"The IDCT algorithm to use", GST_TYPE_IDCT_METHOD,
JPEG_DEFAULT_IDCT_METHOD,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstJpegEnc:snapshot:
*
* Send EOS after encoding a frame, useful for snapshots.
*
* Since: 1.14
*/
g_object_class_install_property (gobject_class, PROP_SNAPSHOT,
g_param_spec_boolean ("snapshot", "Snapshot",
"Send EOS after encoding a frame, useful for snapshots",
JPEG_DEFAULT_SNAPSHOT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template (element_class,
&gst_jpegenc_sink_pad_template);
gst_element_class_add_static_pad_template (element_class,
&gst_jpegenc_src_pad_template);
gst_element_class_set_static_metadata (element_class, "JPEG image encoder",
"Codec/Encoder/Image", "Encode images in JPEG format",
"Wim Taymans <wim.taymans@tvd.be>");
@ -303,6 +317,7 @@ gst_jpegenc_init (GstJpegEnc * jpegenc)
jpegenc->quality = JPEG_DEFAULT_QUALITY;
jpegenc->smoothing = JPEG_DEFAULT_SMOOTHING;
jpegenc->idct_method = JPEG_DEFAULT_IDCT_METHOD;
jpegenc->snapshot = JPEG_DEFAULT_SNAPSHOT;
}
static void
@ -528,7 +543,7 @@ gst_jpegenc_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame)
jpeg_finish_compress (&jpegenc->cinfo);
GST_LOG_OBJECT (jpegenc, "compressing done");
return jpegenc->res;
return (jpegenc->snapshot) ? GST_FLOW_EOS : jpegenc->res;
invalid_frame:
{
@ -566,6 +581,9 @@ gst_jpegenc_set_property (GObject * object, guint prop_id,
case PROP_IDCT_METHOD:
jpegenc->idct_method = g_value_get_enum (value);
break;
case PROP_SNAPSHOT:
jpegenc->snapshot = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -594,6 +612,9 @@ gst_jpegenc_get_property (GObject * object, guint prop_id, GValue * value,
case PROP_IDCT_METHOD:
g_value_set_enum (value, jpegenc->idct_method);
break;
case PROP_SNAPSHOT:
g_value_set_boolean (value, jpegenc->snapshot);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;

1
ext/jpeg/gstjpegenc.h
View file

@ -86,6 +86,7 @@ struct _GstJpegEnc
gint quality;
gint smoothing;
gint idct_method;
gboolean snapshot;
GstMemory *output_mem;
GstMapInfo output_map;