2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
5 * Copyright (C) 2000 Donald A. Graft
7 * This library is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
10 * Library General Public License for more details.
12 * You should have received a copy of the GNU Library General Public
13 * License along with this library; if not, write to the
14 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
15 * Boston, MA 02111-1307, USA.
24 #include "gstpngenc.h"
25 #include <gst/video/video.h>
28 #define MAX_HEIGHT 4096
31 static GstElementDetails gst_pngenc_details = {
33 "Codec/Encoder/Image",
34 "Encode a video frame to a .png image",
35 "Jeremy SIMON <jsimon13@yahoo.fr>",
38 GST_DEBUG_CATEGORY (pngenc_debug);
39 #define GST_CAT_DEFAULT pngenc_debug
41 /* Filter signals and args */
48 #define DEFAULT_SNAPSHOT TRUE
49 /* #define DEFAULT_NEWMEDIA FALSE */
50 #define DEFAULT_COMPRESSION_LEVEL 6
60 static GstStaticPadTemplate pngenc_src_template =
61 GST_STATIC_PAD_TEMPLATE ("src",
64 GST_STATIC_CAPS ("image/png, "
65 "width = (int) [ 16, 4096 ], "
66 "height = (int) [ 16, 4096 ], " "framerate = (fraction) [ 0.0, MAX ]")
69 static GstStaticPadTemplate pngenc_sink_template =
70 GST_STATIC_PAD_TEMPLATE ("sink",
73 GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_RGB)
76 /* static GstElementClass *parent_class = NULL; */
78 GST_BOILERPLATE (GstPngEnc, gst_pngenc, GstElement, GST_TYPE_ELEMENT);
80 static void gst_pngenc_set_property (GObject * object,
81 guint prop_id, const GValue * value, GParamSpec * pspec);
82 static void gst_pngenc_get_property (GObject * object,
83 guint prop_id, GValue * value, GParamSpec * pspec);
85 static GstFlowReturn gst_pngenc_chain (GstPad * pad, GstBuffer * data);
88 user_error_fn (png_structp png_ptr, png_const_charp error_msg)
90 g_warning ("%s", error_msg);
94 user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
96 g_warning ("%s", warning_msg);
100 gst_pngenc_base_init (gpointer g_class)
102 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
104 gst_element_class_add_pad_template
105 (element_class, gst_static_pad_template_get (&pngenc_sink_template));
106 gst_element_class_add_pad_template
107 (element_class, gst_static_pad_template_get (&pngenc_src_template));
108 gst_element_class_set_details (element_class, &gst_pngenc_details);
112 gst_pngenc_class_init (GstPngEncClass * klass)
114 GObjectClass *gobject_class;
115 GstElementClass *gstelement_class;
117 gobject_class = (GObjectClass *) klass;
118 gstelement_class = (GstElementClass *) klass;
120 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
122 gobject_class->get_property = gst_pngenc_get_property;
123 gobject_class->set_property = gst_pngenc_set_property;
125 g_object_class_install_property (gobject_class, ARG_SNAPSHOT,
126 g_param_spec_boolean ("snapshot", "Snapshot",
127 "Send EOS after encoding a frame, useful for snapshots",
128 DEFAULT_SNAPSHOT, (GParamFlags) G_PARAM_READWRITE));
130 /* g_object_class_install_property (gobject_class, ARG_NEWMEDIA, */
131 /* g_param_spec_boolean ("newmedia", "newmedia", */
132 /* "Send new media discontinuity after encoding each frame", */
133 /* DEFAULT_NEWMEDIA, (GParamFlags) G_PARAM_READWRITE)); */
135 g_object_class_install_property
136 (gobject_class, ARG_COMPRESSION_LEVEL,
137 g_param_spec_uint ("compression-level", "compression-level",
138 "PNG compression level",
139 Z_NO_COMPRESSION, Z_BEST_COMPRESSION,
140 DEFAULT_COMPRESSION_LEVEL, (GParamFlags) G_PARAM_READWRITE));
142 GST_DEBUG_CATEGORY_INIT (pngenc_debug, "pngenc", 0, "PNG image encoder");
147 gst_pngenc_setcaps (GstPad * pad, GstCaps * caps)
151 GstStructure *structure;
156 pngenc = GST_PNGENC (gst_pad_get_parent (pad));
158 structure = gst_caps_get_structure (caps, 0);
159 gst_structure_get_int (structure, "width", &pngenc->width);
160 gst_structure_get_int (structure, "height", &pngenc->height);
161 fps = gst_structure_get_value (structure, "framerate");
162 gst_structure_get_int (structure, "bpp", &pngenc->bpp);
164 opeer = gst_pad_get_peer (pngenc->srcpad);
166 pcaps = gst_caps_new_simple ("image/png",
167 "width", G_TYPE_INT, pngenc->width,
168 "height", G_TYPE_INT, pngenc->height, NULL);
169 structure = gst_caps_get_structure (pcaps, 0);
170 gst_structure_set_value (structure, "framerate", fps);
172 if (gst_pad_accept_caps (opeer, pcaps)) {
173 gst_pad_set_caps (pngenc->srcpad, pcaps);
176 gst_caps_unref (pcaps);
177 gst_object_unref (opeer);
180 gst_object_unref (pngenc);
186 gst_pngenc_init (GstPngEnc * pngenc, GstPngEncClass * g_class)
189 pngenc->sinkpad = gst_pad_new_from_template
190 (gst_static_pad_template_get (&pngenc_sink_template), "sink");
191 gst_pad_set_chain_function (pngenc->sinkpad, gst_pngenc_chain);
192 /* gst_pad_set_link_function (pngenc->sinkpad, gst_pngenc_sinklink); */
193 /* gst_pad_set_getcaps_function (pngenc->sinkpad, gst_pngenc_sink_getcaps); */
194 gst_pad_set_setcaps_function (pngenc->sinkpad, gst_pngenc_setcaps);
195 gst_element_add_pad (GST_ELEMENT (pngenc), pngenc->sinkpad);
198 pngenc->srcpad = gst_pad_new_from_template
199 (gst_static_pad_template_get (&pngenc_src_template), "src");
200 /* pngenc->srcpad = gst_pad_new ("src", GST_PAD_SRC); */
201 /* gst_pad_set_getcaps_function (pngenc->srcpad, gst_pngenc_src_getcaps); */
202 /* gst_pad_set_setcaps_function (pngenc->srcpad, gst_pngenc_setcaps); */
203 gst_element_add_pad (GST_ELEMENT (pngenc), pngenc->srcpad);
206 pngenc->png_struct_ptr = NULL;
207 pngenc->png_info_ptr = NULL;
209 pngenc->snapshot = DEFAULT_SNAPSHOT;
210 /* pngenc->newmedia = FALSE; */
211 pngenc->compression_level = DEFAULT_COMPRESSION_LEVEL;
215 user_flush_data (png_structp png_ptr)
219 pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
221 gst_pad_push_event (pngenc->srcpad, gst_event_new_flush_start ());
222 gst_pad_push_event (pngenc->srcpad, gst_event_new_flush_stop ());
227 user_write_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
232 pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
234 buffer = gst_buffer_new ();
235 GST_BUFFER_DATA (buffer) = g_memdup (data, length);
236 GST_BUFFER_SIZE (buffer) = length;
238 if (pngenc->buffer_out) {
241 merge = gst_buffer_merge (pngenc->buffer_out, buffer);
242 gst_buffer_unref (buffer);
243 gst_buffer_unref (pngenc->buffer_out);
244 pngenc->buffer_out = merge;
246 pngenc->buffer_out = buffer;
250 gst_pngenc_chain (GstPad * pad, GstBuffer * buf)
254 png_byte *row_pointers[MAX_HEIGHT];
255 GstFlowReturn ret = GST_FLOW_OK;
257 pngenc = GST_PNGENC (gst_pad_get_parent (pad));
259 GST_DEBUG_OBJECT (pngenc, "BEGINNING");
261 pngenc->buffer_out = NULL;
263 /* initialize png struct stuff */
264 pngenc->png_struct_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING,
265 (png_voidp) NULL, user_error_fn, user_warning_fn);
266 if (pngenc->png_struct_ptr == NULL) {
267 gst_buffer_unref (buf);
268 GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
269 ("Failed to initialize png structure"));
270 ret = GST_FLOW_ERROR;
274 pngenc->png_info_ptr = png_create_info_struct (pngenc->png_struct_ptr);
275 if (!pngenc->png_info_ptr) {
276 gst_buffer_unref (buf);
277 png_destroy_write_struct (&(pngenc->png_struct_ptr), (png_infopp) NULL);
278 GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
279 ("Failed to initialize the png info structure"));
280 ret = GST_FLOW_ERROR;
284 /* non-0 return is from a longjmp inside of libpng */
285 if (setjmp (pngenc->png_struct_ptr->jmpbuf) != 0) {
286 gst_buffer_unref (buf);
287 png_destroy_write_struct (&pngenc->png_struct_ptr, &pngenc->png_info_ptr);
288 GST_ELEMENT_ERROR (pngenc, LIBRARY, FAILED, (NULL),
289 ("returning from longjmp"));
290 ret = GST_FLOW_ERROR;
294 png_set_filter (pngenc->png_struct_ptr, 0,
295 PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE);
296 png_set_compression_level (pngenc->png_struct_ptr, pngenc->compression_level);
298 png_set_IHDR (pngenc->png_struct_ptr,
299 pngenc->png_info_ptr,
303 (pngenc->bpp == 32) ? PNG_COLOR_TYPE_RGBA : PNG_COLOR_TYPE_RGB,
305 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
307 png_set_write_fn (pngenc->png_struct_ptr, pngenc,
308 (png_rw_ptr) user_write_data, user_flush_data);
310 for (row_index = 0; row_index < pngenc->height; row_index++)
311 row_pointers[row_index] = GST_BUFFER_DATA (buf) +
312 (row_index * pngenc->png_info_ptr->rowbytes);
314 png_write_info (pngenc->png_struct_ptr, pngenc->png_info_ptr);
315 png_write_image (pngenc->png_struct_ptr, row_pointers);
316 png_write_end (pngenc->png_struct_ptr, NULL);
318 user_flush_data (pngenc->png_struct_ptr);
320 png_destroy_info_struct (pngenc->png_struct_ptr, &pngenc->png_info_ptr);
321 png_destroy_write_struct (&pngenc->png_struct_ptr, (png_infopp) NULL);
322 gst_buffer_stamp (pngenc->buffer_out, buf);
323 gst_buffer_unref (buf);
325 if ((ret = gst_pad_push (pngenc->srcpad, pngenc->buffer_out)) != GST_FLOW_OK)
328 if (pngenc->snapshot) {
331 GST_DEBUG_OBJECT (pngenc, "snapshot mode, sending EOS");
332 /* send EOS event, since a frame has been pushed out */
333 event = gst_event_new_eos ();
335 ret = gst_pad_push_event (pngenc->srcpad, event);
337 if (!(GST_FLOW_IS_FATAL (ret)))
338 ret = GST_FLOW_UNEXPECTED;
340 /* else if (pngenc->newmedia) { */
341 /* /\* send new media discont *\/ */
342 /* GstEvent *newmedia_event; */
344 /* newmedia_event = */
345 /* gst_event_new_discontinuous (TRUE, GST_FORMAT_TIME, (gint64) 0, */
346 /* GST_FORMAT_UNDEFINED); */
347 /* ret = gst_pad_push (pngenc->srcpad, GST_DATA (newmedia_event)); */
350 GST_DEBUG_OBJECT (pngenc, "END, ret:%d", ret);
352 gst_object_unref (pngenc);
358 gst_pngenc_get_property (GObject * object,
359 guint prop_id, GValue * value, GParamSpec * pspec)
363 pngenc = GST_PNGENC (object);
367 g_value_set_boolean (value, pngenc->snapshot);
369 /* case ARG_NEWMEDIA: */
370 /* g_value_set_boolean (value, pngenc->newmedia); */
372 case ARG_COMPRESSION_LEVEL:
373 g_value_set_uint (value, pngenc->compression_level);
376 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
383 gst_pngenc_set_property (GObject * object,
384 guint prop_id, const GValue * value, GParamSpec * pspec)
388 pngenc = GST_PNGENC (object);
392 pngenc->snapshot = g_value_get_boolean (value);
394 /* case ARG_NEWMEDIA: */
395 /* pngenc->newmedia = g_value_get_boolean (value); */
397 case ARG_COMPRESSION_LEVEL:
398 pngenc->compression_level = g_value_get_uint (value);
401 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);