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 GST_ELEMENT_REGISTER_DEFINE (videosegmentclip, "videosegmentclip",
49 GST_RANK_NONE, GST_TYPE_VIDEO_SEGMENT_CLIP);
50
51 static void
gst_video_segment_clip_class_init(GstVideoSegmentClipClass * klass)52 gst_video_segment_clip_class_init (GstVideoSegmentClipClass * klass)
53 {
54 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
55 GstSegmentClipClass *segment_clip_klass = GST_SEGMENT_CLIP_CLASS (klass);
56
57 GST_DEBUG_CATEGORY_INIT (gst_video_segment_clip_debug, "videosegmentclip", 0,
58 "videosegmentclip element");
59
60 gst_element_class_set_static_metadata (element_class,
61 "Video buffer segment clipper",
62 "Filter/Video",
63 "Clips video buffers to the configured segment",
64 "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
65
66 gst_element_class_add_static_pad_template (element_class, &sink_pad_template);
67 gst_element_class_add_static_pad_template (element_class, &src_pad_template);
68
69 segment_clip_klass->reset = GST_DEBUG_FUNCPTR (gst_video_segment_clip_reset);
70 segment_clip_klass->set_caps =
71 GST_DEBUG_FUNCPTR (gst_video_segment_clip_set_caps);
72 segment_clip_klass->clip_buffer =
73 GST_DEBUG_FUNCPTR (gst_video_segment_clip_clip_buffer);
74 }
75
76 static void
gst_video_segment_clip_init(GstVideoSegmentClip * self)77 gst_video_segment_clip_init (GstVideoSegmentClip * self)
78 {
79 }
80
81 static void
gst_video_segment_clip_reset(GstSegmentClip * base)82 gst_video_segment_clip_reset (GstSegmentClip * base)
83 {
84 GstVideoSegmentClip *self = GST_VIDEO_SEGMENT_CLIP (base);
85
86 GST_DEBUG_OBJECT (self, "Resetting internal state");
87
88 self->fps_n = self->fps_d = 0;
89 }
90
91
92 static GstFlowReturn
gst_video_segment_clip_clip_buffer(GstSegmentClip * base,GstBuffer * buffer,GstBuffer ** outbuf)93 gst_video_segment_clip_clip_buffer (GstSegmentClip * base, GstBuffer * buffer,
94 GstBuffer ** outbuf)
95 {
96 GstVideoSegmentClip *self = GST_VIDEO_SEGMENT_CLIP (base);
97 GstSegment *segment = &base->segment;
98 GstClockTime timestamp, duration;
99 guint64 cstart, cstop;
100 gboolean in_seg;
101
102 if (!self->fps_d) {
103 GST_ERROR_OBJECT (self, "Not negotiated yet");
104 gst_buffer_unref (buffer);
105 return GST_FLOW_NOT_NEGOTIATED;
106 }
107
108 if (segment->format != GST_FORMAT_TIME) {
109 GST_DEBUG_OBJECT (self, "Unsupported segment format %s",
110 gst_format_get_name (segment->format));
111 *outbuf = buffer;
112 return GST_FLOW_OK;
113 }
114
115 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) {
116 GST_WARNING_OBJECT (self, "Buffer without valid timestamp");
117 *outbuf = buffer;
118 return GST_FLOW_OK;
119 }
120
121 if (self->fps_n == 0) {
122 *outbuf = buffer;
123 return GST_FLOW_OK;
124 }
125
126 timestamp = GST_BUFFER_TIMESTAMP (buffer);
127 duration = GST_BUFFER_DURATION (buffer);
128 if (!GST_CLOCK_TIME_IS_VALID (duration))
129 duration = gst_util_uint64_scale (GST_SECOND, self->fps_d, self->fps_n);
130
131 in_seg =
132 gst_segment_clip (segment, GST_FORMAT_TIME, timestamp,
133 timestamp + duration, &cstart, &cstop);
134 if (in_seg) {
135 if (timestamp != cstart || timestamp + duration != cstop) {
136 *outbuf = gst_buffer_make_writable (buffer);
137
138 GST_BUFFER_TIMESTAMP (*outbuf) = cstart;
139 GST_BUFFER_DURATION (*outbuf) = cstop - cstart;
140 } else {
141 *outbuf = buffer;
142 }
143 } else {
144 GST_DEBUG_OBJECT (self, "Buffer outside the configured segment");
145
146 gst_buffer_unref (buffer);
147 if (segment->rate >= 0) {
148 if (segment->stop != -1 && timestamp >= segment->stop)
149 return GST_FLOW_EOS;
150 } else {
151 if (segment->start != -1 && timestamp + duration <= segment->start)
152 return GST_FLOW_EOS;
153 }
154 }
155
156
157 return GST_FLOW_OK;
158 }
159
160 static gboolean
gst_video_segment_clip_set_caps(GstSegmentClip * base,GstCaps * caps)161 gst_video_segment_clip_set_caps (GstSegmentClip * base, GstCaps * caps)
162 {
163 GstVideoSegmentClip *self = GST_VIDEO_SEGMENT_CLIP (base);
164 gboolean ret;
165 GstStructure *s;
166 gint fps_n, fps_d;
167
168 s = gst_caps_get_structure (caps, 0);
169
170 ret = gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d)
171 && (fps_d != 0);
172
173 if (ret) {
174 GST_DEBUG_OBJECT (self, "Configured framerate %d/%d", fps_n, fps_d);
175 self->fps_n = fps_n;
176 self->fps_d = fps_d;
177 }
178
179 return ret;
180 }
181