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/* GStreamer
* Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include "gstvideosegmentclip.h"
static GstStaticPadTemplate sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw, framerate=" GST_VIDEO_FPS_RANGE));
static GstStaticPadTemplate src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw, framerate=" GST_VIDEO_FPS_RANGE));
static void gst_video_segment_clip_reset (GstSegmentClip * self);
static GstFlowReturn gst_video_segment_clip_clip_buffer (GstSegmentClip * self,
GstBuffer * buffer, GstBuffer ** outbuf);
static gboolean gst_video_segment_clip_set_caps (GstSegmentClip * self,
GstCaps * caps);
GST_DEBUG_CATEGORY_STATIC (gst_video_segment_clip_debug);
#define GST_CAT_DEFAULT gst_video_segment_clip_debug
G_DEFINE_TYPE (GstVideoSegmentClip, gst_video_segment_clip,
GST_TYPE_SEGMENT_CLIP);
static void
gst_video_segment_clip_class_init (GstVideoSegmentClipClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstSegmentClipClass *segment_clip_klass = GST_SEGMENT_CLIP_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_video_segment_clip_debug, "videosegmentclip", 0,
"videosegmentclip element");
gst_element_class_set_static_metadata (element_class,
"Video buffer segment clipper",
"Filter/Video",
"Clips video buffers to the configured segment",
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_pad_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_pad_template));
segment_clip_klass->reset = GST_DEBUG_FUNCPTR (gst_video_segment_clip_reset);
segment_clip_klass->set_caps =
GST_DEBUG_FUNCPTR (gst_video_segment_clip_set_caps);
segment_clip_klass->clip_buffer =
GST_DEBUG_FUNCPTR (gst_video_segment_clip_clip_buffer);
}
static void
gst_video_segment_clip_init (GstVideoSegmentClip * self)
{
}
static void
gst_video_segment_clip_reset (GstSegmentClip * base)
{
GstVideoSegmentClip *self = GST_VIDEO_SEGMENT_CLIP (base);
GST_DEBUG_OBJECT (self, "Resetting internal state");
self->fps_n = self->fps_d = 0;
}
static GstFlowReturn
gst_video_segment_clip_clip_buffer (GstSegmentClip * base, GstBuffer * buffer,
GstBuffer ** outbuf)
{
GstVideoSegmentClip *self = GST_VIDEO_SEGMENT_CLIP (base);
GstSegment *segment = &base->segment;
GstClockTime timestamp, duration;
guint64 cstart, cstop;
gboolean in_seg;
if (!self->fps_d) {
GST_ERROR_OBJECT (self, "Not negotiated yet");
gst_buffer_unref (buffer);
return GST_FLOW_NOT_NEGOTIATED;
}
if (segment->format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (self, "Unsupported segment format %s",
gst_format_get_name (segment->format));
*outbuf = buffer;
return GST_FLOW_OK;
}
if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) {
GST_WARNING_OBJECT (self, "Buffer without valid timestamp");
*outbuf = buffer;
return GST_FLOW_OK;
}
if (self->fps_n == 0) {
*outbuf = buffer;
return GST_FLOW_OK;
}
timestamp = GST_BUFFER_TIMESTAMP (buffer);
duration = GST_BUFFER_DURATION (buffer);
if (!GST_CLOCK_TIME_IS_VALID (duration))
duration = gst_util_uint64_scale (GST_SECOND, self->fps_d, self->fps_n);
in_seg =
gst_segment_clip (segment, GST_FORMAT_TIME, timestamp,
timestamp + duration, &cstart, &cstop);
if (in_seg) {
if (timestamp != cstart || timestamp + duration != cstop) {
*outbuf = gst_buffer_make_writable (buffer);
GST_BUFFER_TIMESTAMP (*outbuf) = cstart;
GST_BUFFER_DURATION (*outbuf) = cstop - cstart;
} else {
*outbuf = buffer;
}
} else {
GST_DEBUG_OBJECT (self, "Buffer outside the configured segment");
gst_buffer_unref (buffer);
if (segment->rate >= 0) {
if (segment->stop != -1 && timestamp >= segment->stop)
return GST_FLOW_EOS;
} else {
if (segment->start != -1 && timestamp + duration <= segment->start)
return GST_FLOW_EOS;
}
}
return GST_FLOW_OK;
}
static gboolean
gst_video_segment_clip_set_caps (GstSegmentClip * base, GstCaps * caps)
{
GstVideoSegmentClip *self = GST_VIDEO_SEGMENT_CLIP (base);
gboolean ret;
GstStructure *s;
gint fps_n, fps_d;
s = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d)
&& (fps_d != 0);
if (ret) {
GST_DEBUG_OBJECT (self, "Configured framerate %d/%d", fps_n, fps_d);
self->fps_n = fps_n;
self->fps_d = fps_d;
}
return ret;
}
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