1 /* GStreamer
2 * Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include <gst/gst.h>
25 #include <gst/video/video.h>
26
27 #include "gstvideosegmentclip.h"
28
29 static GstStaticPadTemplate sink_pad_template =
30 GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
31 GST_STATIC_CAPS ("video/x-raw, framerate=" GST_VIDEO_FPS_RANGE));
32
33 static GstStaticPadTemplate src_pad_template =
34 GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
35 GST_STATIC_CAPS ("video/x-raw, framerate=" GST_VIDEO_FPS_RANGE));
36
37 static void gst_video_segment_clip_reset (GstSegmentClip * self);
38 static GstFlowReturn gst_video_segment_clip_clip_buffer (GstSegmentClip * self,
39 GstBuffer * buffer, GstBuffer ** outbuf);
40 static gboolean gst_video_segment_clip_set_caps (GstSegmentClip * self,
41 GstCaps * caps);
42
43 GST_DEBUG_CATEGORY_STATIC (gst_video_segment_clip_debug);
44 #define GST_CAT_DEFAULT gst_video_segment_clip_debug
45
46 G_DEFINE_TYPE (GstVideoSegmentClip, gst_video_segment_clip,
47 GST_TYPE_SEGMENT_CLIP);
48
49 static void
gst_video_segment_clip_class_init(GstVideoSegmentClipClass * klass)50 gst_video_segment_clip_class_init (GstVideoSegmentClipClass * klass)
51 {
52 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
53 GstSegmentClipClass *segment_clip_klass = GST_SEGMENT_CLIP_CLASS (klass);
54
55 GST_DEBUG_CATEGORY_INIT (gst_video_segment_clip_debug, "videosegmentclip", 0,
56 "videosegmentclip element");
57
58 gst_element_class_set_static_metadata (element_class,
59 "Video buffer segment clipper",
60 "Filter/Video",
61 "Clips video buffers to the configured segment",
62 "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
63
64 gst_element_class_add_static_pad_template (element_class, &sink_pad_template);
65 gst_element_class_add_static_pad_template (element_class, &src_pad_template);
66
67 segment_clip_klass->reset = GST_DEBUG_FUNCPTR (gst_video_segment_clip_reset);
68 segment_clip_klass->set_caps =
69 GST_DEBUG_FUNCPTR (gst_video_segment_clip_set_caps);
70 segment_clip_klass->clip_buffer =
71 GST_DEBUG_FUNCPTR (gst_video_segment_clip_clip_buffer);
72 }
73
74 static void
gst_video_segment_clip_init(GstVideoSegmentClip * self)75 gst_video_segment_clip_init (GstVideoSegmentClip * self)
76 {
77 }
78
79 static void
gst_video_segment_clip_reset(GstSegmentClip * base)80 gst_video_segment_clip_reset (GstSegmentClip * base)
81 {
82 GstVideoSegmentClip *self = GST_VIDEO_SEGMENT_CLIP (base);
83
84 GST_DEBUG_OBJECT (self, "Resetting internal state");
85
86 self->fps_n = self->fps_d = 0;
87 }
88
89
90 static GstFlowReturn
gst_video_segment_clip_clip_buffer(GstSegmentClip * base,GstBuffer * buffer,GstBuffer ** outbuf)91 gst_video_segment_clip_clip_buffer (GstSegmentClip * base, GstBuffer * buffer,
92 GstBuffer ** outbuf)
93 {
94 GstVideoSegmentClip *self = GST_VIDEO_SEGMENT_CLIP (base);
95 GstSegment *segment = &base->segment;
96 GstClockTime timestamp, duration;
97 guint64 cstart, cstop;
98 gboolean in_seg;
99
100 if (!self->fps_d) {
101 GST_ERROR_OBJECT (self, "Not negotiated yet");
102 gst_buffer_unref (buffer);
103 return GST_FLOW_NOT_NEGOTIATED;
104 }
105
106 if (segment->format != GST_FORMAT_TIME) {
107 GST_DEBUG_OBJECT (self, "Unsupported segment format %s",
108 gst_format_get_name (segment->format));
109 *outbuf = buffer;
110 return GST_FLOW_OK;
111 }
112
113 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) {
114 GST_WARNING_OBJECT (self, "Buffer without valid timestamp");
115 *outbuf = buffer;
116 return GST_FLOW_OK;
117 }
118
119 if (self->fps_n == 0) {
120 *outbuf = buffer;
121 return GST_FLOW_OK;
122 }
123
124 timestamp = GST_BUFFER_TIMESTAMP (buffer);
125 duration = GST_BUFFER_DURATION (buffer);
126 if (!GST_CLOCK_TIME_IS_VALID (duration))
127 duration = gst_util_uint64_scale (GST_SECOND, self->fps_d, self->fps_n);
128
129 in_seg =
130 gst_segment_clip (segment, GST_FORMAT_TIME, timestamp,
131 timestamp + duration, &cstart, &cstop);
132 if (in_seg) {
133 if (timestamp != cstart || timestamp + duration != cstop) {
134 *outbuf = gst_buffer_make_writable (buffer);
135
136 GST_BUFFER_TIMESTAMP (*outbuf) = cstart;
137 GST_BUFFER_DURATION (*outbuf) = cstop - cstart;
138 } else {
139 *outbuf = buffer;
140 }
141 } else {
142 GST_DEBUG_OBJECT (self, "Buffer outside the configured segment");
143
144 gst_buffer_unref (buffer);
145 if (segment->rate >= 0) {
146 if (segment->stop != -1 && timestamp >= segment->stop)
147 return GST_FLOW_EOS;
148 } else {
149 if (segment->start != -1 && timestamp + duration <= segment->start)
150 return GST_FLOW_EOS;
151 }
152 }
153
154
155 return GST_FLOW_OK;
156 }
157
158 static gboolean
gst_video_segment_clip_set_caps(GstSegmentClip * base,GstCaps * caps)159 gst_video_segment_clip_set_caps (GstSegmentClip * base, GstCaps * caps)
160 {
161 GstVideoSegmentClip *self = GST_VIDEO_SEGMENT_CLIP (base);
162 gboolean ret;
163 GstStructure *s;
164 gint fps_n, fps_d;
165
166 s = gst_caps_get_structure (caps, 0);
167
168 ret = gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d)
169 && (fps_d != 0);
170
171 if (ret) {
172 GST_DEBUG_OBJECT (self, "Configured framerate %d/%d", fps_n, fps_d);
173 self->fps_n = fps_n;
174 self->fps_d = fps_d;
175 }
176
177 return ret;
178 }
179