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