1 /* GStreamer
2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3 * Copyright (C) <2006> Mark Nauwelaerts <mnauw@users.sourceforge.net>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20 /**
21 * SECTION:element-y4menc
22 * @title: y4menc
23 *
24 * Creates a YU4MPEG2 raw video stream as defined by the mjpegtools project.
25 *
26 * ## Example launch line
27 *
28 * (write everything in one line, without the backslash characters)
29 * |[
30 * gst-launch-1.0 videotestsrc num-buffers=250 \
31 * ! 'video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1' \
32 * ! y4menc ! filesink location=test.yuv
33 * ]|
34 *
35 */
36
37 /* see mjpegtools/yuv4mpeg.h for yuv4mpeg format */
38
39 #ifdef HAVE_CONFIG_H
40 #include "config.h"
41 #endif
42 #include <string.h>
43 #include <gst/gst.h>
44 #include <gst/video/video.h>
45 #include "gsty4mencode.h"
46
47 /* Filter signals and args */
48 enum
49 {
50 /* FILL ME */
51 LAST_SIGNAL
52 };
53
54 enum
55 {
56 PROP_0
57 };
58
59 static GstStaticPadTemplate y4mencode_src_factory =
60 GST_STATIC_PAD_TEMPLATE ("src",
61 GST_PAD_SRC,
62 GST_PAD_ALWAYS,
63 GST_STATIC_CAPS ("application/x-yuv4mpeg, " "y4mversion = (int) 2")
64 );
65
66 static GstStaticPadTemplate y4mencode_sink_factory =
67 GST_STATIC_PAD_TEMPLATE ("sink",
68 GST_PAD_SINK,
69 GST_PAD_ALWAYS,
70 GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ IYUV, I420, Y42B, Y41B, Y444 }"))
71 );
72
73
74 static void gst_y4m_encode_reset (GstY4mEncode * filter);
75
76 static GstStateChangeReturn gst_y4m_encode_change_state (GstElement * element,
77 GstStateChange transition);
78
79 static GstFlowReturn
80 gst_y4m_encode_handle_frame (GstVideoEncoder * encoder,
81 GstVideoCodecFrame * frame);
82 static gboolean gst_y4m_encode_set_format (GstVideoEncoder * encoder,
83 GstVideoCodecState * state);
84
85 #define gst_y4m_encode_parent_class parent_class
86 G_DEFINE_TYPE (GstY4mEncode, gst_y4m_encode, GST_TYPE_VIDEO_ENCODER);
87 GST_ELEMENT_REGISTER_DEFINE (y4menc, "y4menc", GST_RANK_PRIMARY,
88 GST_TYPE_Y4M_ENCODE);
89
90 static void
gst_y4m_encode_class_init(GstY4mEncodeClass * klass)91 gst_y4m_encode_class_init (GstY4mEncodeClass * klass)
92 {
93 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
94 GstVideoEncoderClass *venc_class = GST_VIDEO_ENCODER_CLASS (klass);
95
96 element_class->change_state = GST_DEBUG_FUNCPTR (gst_y4m_encode_change_state);
97
98 gst_element_class_add_static_pad_template (element_class,
99 &y4mencode_src_factory);
100 gst_element_class_add_static_pad_template (element_class,
101 &y4mencode_sink_factory);
102
103 gst_element_class_set_static_metadata (element_class,
104 "YUV4MPEG video encoder", "Codec/Encoder/Video",
105 "Encodes a YUV frame into the yuv4mpeg format (mjpegtools)",
106 "Wim Taymans <wim.taymans@gmail.com>");
107 venc_class->set_format = gst_y4m_encode_set_format;
108 venc_class->handle_frame = gst_y4m_encode_handle_frame;
109
110 }
111
112 static void
gst_y4m_encode_init(GstY4mEncode * filter)113 gst_y4m_encode_init (GstY4mEncode * filter)
114 {
115 GST_PAD_SET_ACCEPT_TEMPLATE (GST_VIDEO_ENCODER_SINK_PAD (filter));
116
117 /* init properties */
118 gst_y4m_encode_reset (filter);
119 }
120
121 static void
gst_y4m_encode_reset(GstY4mEncode * filter)122 gst_y4m_encode_reset (GstY4mEncode * filter)
123 {
124 filter->header = FALSE;
125 }
126
127 static gboolean
gst_y4m_encode_set_format(GstVideoEncoder * encoder,GstVideoCodecState * state)128 gst_y4m_encode_set_format (GstVideoEncoder * encoder,
129 GstVideoCodecState * state)
130 {
131 GstY4mEncode *y4menc;
132 GstVideoInfo *info;
133 GstVideoCodecState *output_state;
134
135 y4menc = GST_Y4M_ENCODE (encoder);
136 info = &state->info;
137
138 switch (GST_VIDEO_INFO_FORMAT (info)) {
139 case GST_VIDEO_FORMAT_I420:
140 y4menc->colorspace = "420";
141 break;
142 case GST_VIDEO_FORMAT_Y42B:
143 y4menc->colorspace = "422";
144 break;
145 case GST_VIDEO_FORMAT_Y41B:
146 y4menc->colorspace = "411";
147 break;
148 case GST_VIDEO_FORMAT_Y444:
149 y4menc->colorspace = "444";
150 break;
151 default:
152 goto invalid_format;
153 }
154
155 y4menc->info = *info;
156
157 output_state =
158 gst_video_encoder_set_output_state (encoder,
159 gst_static_pad_template_get_caps (&y4mencode_src_factory), state);
160 gst_video_codec_state_unref (output_state);
161
162 return TRUE;
163
164 invalid_format:
165 {
166 GST_ERROR_OBJECT (y4menc, "Invalid format");
167 return FALSE;
168 }
169
170 }
171
172 static inline GstBuffer *
gst_y4m_encode_get_stream_header(GstY4mEncode * filter,gboolean tff)173 gst_y4m_encode_get_stream_header (GstY4mEncode * filter, gboolean tff)
174 {
175 gpointer header;
176 GstBuffer *buf;
177 gchar interlaced;
178 gsize len;
179
180 if (GST_VIDEO_INFO_IS_INTERLACED (&filter->info)) {
181 if (tff)
182 interlaced = 't';
183 else
184 interlaced = 'b';
185 } else {
186 interlaced = 'p';
187 }
188
189 header = g_strdup_printf ("YUV4MPEG2 C%s W%d H%d I%c F%d:%d A%d:%d\n",
190 filter->colorspace, GST_VIDEO_INFO_WIDTH (&filter->info),
191 GST_VIDEO_INFO_HEIGHT (&filter->info), interlaced,
192 GST_VIDEO_INFO_FPS_N (&filter->info),
193 GST_VIDEO_INFO_FPS_D (&filter->info),
194 GST_VIDEO_INFO_PAR_N (&filter->info),
195 GST_VIDEO_INFO_PAR_D (&filter->info));
196 len = strlen (header);
197
198 buf = gst_buffer_new ();
199 gst_buffer_append_memory (buf,
200 gst_memory_new_wrapped (0, header, len, 0, len, header, g_free));
201
202 return buf;
203 }
204
205 static inline GstBuffer *
gst_y4m_encode_get_frame_header(GstY4mEncode * filter)206 gst_y4m_encode_get_frame_header (GstY4mEncode * filter)
207 {
208 gpointer header;
209 GstBuffer *buf;
210 gsize len;
211
212 header = g_strdup_printf ("FRAME\n");
213 len = strlen (header);
214
215 buf = gst_buffer_new ();
216 gst_buffer_append_memory (buf,
217 gst_memory_new_wrapped (0, header, len, 0, len, header, g_free));
218
219 return buf;
220 }
221
222
223 static GstFlowReturn
gst_y4m_encode_handle_frame(GstVideoEncoder * encoder,GstVideoCodecFrame * frame)224 gst_y4m_encode_handle_frame (GstVideoEncoder * encoder,
225 GstVideoCodecFrame * frame)
226 {
227 GstY4mEncode *filter = GST_Y4M_ENCODE (encoder);
228 GstClockTime timestamp;
229
230 /* check we got some decent info from caps */
231 if (GST_VIDEO_INFO_FORMAT (&filter->info) == GST_VIDEO_FORMAT_UNKNOWN)
232 goto not_negotiated;
233
234 timestamp = GST_BUFFER_TIMESTAMP (frame->input_buffer);
235
236 if (G_UNLIKELY (!filter->header)) {
237 gboolean tff = FALSE;
238
239 if (GST_VIDEO_INFO_IS_INTERLACED (&filter->info)) {
240 tff =
241 GST_BUFFER_FLAG_IS_SET (frame->input_buffer,
242 GST_VIDEO_BUFFER_FLAG_TFF);
243 }
244 frame->output_buffer = gst_y4m_encode_get_stream_header (filter, tff);
245 filter->header = TRUE;
246 frame->output_buffer =
247 gst_buffer_append (frame->output_buffer,
248 gst_y4m_encode_get_frame_header (filter));
249 } else {
250 frame->output_buffer = gst_y4m_encode_get_frame_header (filter);
251 }
252
253 frame->output_buffer =
254 gst_buffer_append (frame->output_buffer,
255 gst_buffer_copy (frame->input_buffer));
256
257 /* decorate */
258 frame->output_buffer = gst_buffer_make_writable (frame->output_buffer);
259 GST_BUFFER_TIMESTAMP (frame->output_buffer) = timestamp;
260
261 return gst_video_encoder_finish_frame (encoder, frame);
262
263 not_negotiated:
264 {
265 GST_ELEMENT_ERROR (filter, CORE, NEGOTIATION, (NULL),
266 ("format wasn't negotiated"));
267
268 return GST_FLOW_NOT_NEGOTIATED;
269 }
270 }
271
272 static GstStateChangeReturn
gst_y4m_encode_change_state(GstElement * element,GstStateChange transition)273 gst_y4m_encode_change_state (GstElement * element, GstStateChange transition)
274 {
275 GstY4mEncode *filter = GST_Y4M_ENCODE (element);
276 GstStateChangeReturn ret;
277
278 switch (transition) {
279 case GST_STATE_CHANGE_NULL_TO_READY:
280 case GST_STATE_CHANGE_READY_TO_PAUSED:
281 break;
282 default:
283 break;
284 }
285
286 ret = GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, change_state,
287 (element, transition), GST_STATE_CHANGE_SUCCESS);
288 if (ret != GST_STATE_CHANGE_SUCCESS)
289 return ret;
290
291 switch (transition) {
292 case GST_STATE_CHANGE_PAUSED_TO_READY:
293 gst_y4m_encode_reset (filter);
294 break;
295 default:
296 break;
297 }
298
299 return GST_STATE_CHANGE_SUCCESS;
300 }
301
302 static gboolean
plugin_init(GstPlugin * plugin)303 plugin_init (GstPlugin * plugin)
304 {
305 return GST_ELEMENT_REGISTER (y4menc, plugin);
306 }
307
308 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
309 GST_VERSION_MINOR,
310 y4menc,
311 "Encodes a YUV frame into the yuv4mpeg format (mjpegtools)",
312 plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
313