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.
19 * SECTION:element-pngenc
29 #include "gstpngenc.h"
32 GST_DEBUG_CATEGORY_STATIC (pngenc_debug);
33 #define GST_CAT_DEFAULT pngenc_debug
35 /* Filter signals and args */
42 #define DEFAULT_SNAPSHOT FALSE
43 /* #define DEFAULT_NEWMEDIA FALSE */
44 #define DEFAULT_COMPRESSION_LEVEL 6
54 static GstStaticPadTemplate pngenc_src_template =
55 GST_STATIC_PAD_TEMPLATE ("src",
58 GST_STATIC_CAPS ("image/png, "
59 "width = (int) [ 16, 1000000 ], "
60 "height = (int) [ 16, 1000000 ], " "framerate = " GST_VIDEO_FPS_RANGE)
63 static GstStaticPadTemplate pngenc_sink_template =
64 GST_STATIC_PAD_TEMPLATE ("sink",
67 GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ RGBA, RGB, GRAY8, GRAY16_BE }"))
70 /* static GstElementClass *parent_class = NULL; */
72 G_DEFINE_TYPE (GstPngEnc, gst_pngenc, GST_TYPE_ELEMENT);
74 static void gst_pngenc_set_property (GObject * object,
75 guint prop_id, const GValue * value, GParamSpec * pspec);
76 static void gst_pngenc_get_property (GObject * object,
77 guint prop_id, GValue * value, GParamSpec * pspec);
79 static GstFlowReturn gst_pngenc_chain (GstPad * pad, GstObject * parent,
81 static gboolean gst_pngenc_sink_event (GstPad * pad, GstObject * parent,
85 user_error_fn (png_structp png_ptr, png_const_charp error_msg)
87 g_warning ("%s", error_msg);
91 user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
93 g_warning ("%s", warning_msg);
97 gst_pngenc_class_init (GstPngEncClass * klass)
99 GObjectClass *gobject_class;
100 GstElementClass *element_class;
102 gobject_class = (GObjectClass *) klass;
103 element_class = (GstElementClass *) klass;
105 gobject_class->get_property = gst_pngenc_get_property;
106 gobject_class->set_property = gst_pngenc_set_property;
108 g_object_class_install_property (gobject_class, ARG_SNAPSHOT,
109 g_param_spec_boolean ("snapshot", "Snapshot",
110 "Send EOS after encoding a frame, useful for snapshots",
111 DEFAULT_SNAPSHOT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
113 /* g_object_class_install_property (gobject_class, ARG_NEWMEDIA, */
114 /* g_param_spec_boolean ("newmedia", "newmedia", */
115 /* "Send new media discontinuity after encoding each frame", */
116 /* DEFAULT_NEWMEDIA, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); */
118 g_object_class_install_property (gobject_class, ARG_COMPRESSION_LEVEL,
119 g_param_spec_uint ("compression-level", "compression-level",
120 "PNG compression level",
121 Z_NO_COMPRESSION, Z_BEST_COMPRESSION,
122 DEFAULT_COMPRESSION_LEVEL,
123 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
125 gst_element_class_add_pad_template
126 (element_class, gst_static_pad_template_get (&pngenc_sink_template));
127 gst_element_class_add_pad_template
128 (element_class, gst_static_pad_template_get (&pngenc_src_template));
129 gst_element_class_set_static_metadata (element_class, "PNG image encoder",
130 "Codec/Encoder/Image",
131 "Encode a video frame to a .png image",
132 "Jeremy SIMON <jsimon13@yahoo.fr>");
134 GST_DEBUG_CATEGORY_INIT (pngenc_debug, "pngenc", 0, "PNG image encoder");
139 gst_pngenc_setcaps (GstPngEnc * pngenc, GstCaps * caps)
146 ret = gst_video_info_from_caps (&info, caps);
148 if (G_UNLIKELY (!ret))
153 switch (GST_VIDEO_INFO_FORMAT (&info)) {
154 case GST_VIDEO_FORMAT_RGBA:
155 pngenc->png_color_type = PNG_COLOR_TYPE_RGBA;
158 case GST_VIDEO_FORMAT_RGB:
159 pngenc->png_color_type = PNG_COLOR_TYPE_RGB;
162 case GST_VIDEO_FORMAT_GRAY8:
163 pngenc->png_color_type = PNG_COLOR_TYPE_GRAY;
166 case GST_VIDEO_FORMAT_GRAY16_BE:
167 pngenc->png_color_type = PNG_COLOR_TYPE_GRAY;
175 pngenc->width = GST_VIDEO_INFO_WIDTH (&info);
176 pngenc->height = GST_VIDEO_INFO_HEIGHT (&info);
177 fps_n = GST_VIDEO_INFO_FPS_N (&info);
178 fps_d = GST_VIDEO_INFO_FPS_D (&info);
180 if (G_UNLIKELY (pngenc->width < 16 || pngenc->width > 1000000 ||
181 pngenc->height < 16 || pngenc->height > 1000000)) {
186 pcaps = gst_caps_new_simple ("image/png",
187 "width", G_TYPE_INT, pngenc->width,
188 "height", G_TYPE_INT, pngenc->height,
189 "framerate", GST_TYPE_FRACTION, fps_n, fps_d, NULL);
191 ret = gst_pad_set_caps (pngenc->srcpad, pcaps);
193 gst_caps_unref (pcaps);
197 if (G_UNLIKELY (!ret)) {
206 gst_pngenc_init (GstPngEnc * pngenc)
209 pngenc->sinkpad = gst_pad_new_from_static_template
210 (&pngenc_sink_template, "sink");
211 gst_pad_set_chain_function (pngenc->sinkpad,
212 GST_DEBUG_FUNCPTR (gst_pngenc_chain));
213 gst_pad_set_event_function (pngenc->sinkpad,
214 GST_DEBUG_FUNCPTR (gst_pngenc_sink_event));
215 gst_element_add_pad (GST_ELEMENT (pngenc), pngenc->sinkpad);
218 pngenc->srcpad = gst_pad_new_from_static_template
219 (&pngenc_src_template, "src");
220 gst_pad_use_fixed_caps (pngenc->srcpad);
221 gst_element_add_pad (GST_ELEMENT (pngenc), pngenc->srcpad);
224 pngenc->png_struct_ptr = NULL;
225 pngenc->png_info_ptr = NULL;
227 pngenc->snapshot = DEFAULT_SNAPSHOT;
228 /* pngenc->newmedia = FALSE; */
229 pngenc->compression_level = DEFAULT_COMPRESSION_LEVEL;
233 user_flush_data (png_structp png_ptr G_GNUC_UNUSED)
238 user_write_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
243 pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
245 gst_buffer_map (pngenc->buffer_out, &map, GST_MAP_WRITE);
246 if (pngenc->written + length >= map.size) {
247 gst_buffer_unmap (pngenc->buffer_out, &map);
248 GST_ERROR_OBJECT (pngenc, "output buffer bigger than the input buffer!?");
249 png_error (png_ptr, "output buffer bigger than the input buffer!?");
255 GST_DEBUG_OBJECT (pngenc, "writing %u bytes", (guint) length);
257 memcpy (map.data + pngenc->written, data, length);
258 gst_buffer_unmap (pngenc->buffer_out, &map);
259 pngenc->written += length;
263 gst_pngenc_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
267 png_byte **row_pointers;
268 GstFlowReturn ret = GST_FLOW_OK;
269 GstBuffer *encoded_buf = NULL;
272 pngenc = GST_PNGENC (parent);
274 GST_DEBUG_OBJECT (pngenc, "BEGINNING");
276 if (G_UNLIKELY (pngenc->width <= 0 || pngenc->height <= 0)) {
277 ret = GST_FLOW_NOT_NEGOTIATED;
281 if (!gst_video_frame_map (&frame, &pngenc->info, buf, GST_MAP_READ)) {
282 GST_ELEMENT_ERROR (pngenc, STREAM, FORMAT, (NULL),
283 ("Failed to map video frame, caps problem?"));
284 ret = GST_FLOW_ERROR;
288 /* initialize png struct stuff */
289 pngenc->png_struct_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING,
290 (png_voidp) NULL, user_error_fn, user_warning_fn);
291 if (pngenc->png_struct_ptr == NULL) {
292 GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
293 ("Failed to initialize png structure"));
294 ret = GST_FLOW_ERROR;
298 pngenc->png_info_ptr = png_create_info_struct (pngenc->png_struct_ptr);
299 if (!pngenc->png_info_ptr) {
300 png_destroy_write_struct (&(pngenc->png_struct_ptr), (png_infopp) NULL);
301 GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
302 ("Failed to initialize the png info structure"));
303 ret = GST_FLOW_ERROR;
307 /* non-0 return is from a longjmp inside of libpng */
308 if (setjmp (png_jmpbuf (pngenc->png_struct_ptr)) != 0) {
309 png_destroy_write_struct (&pngenc->png_struct_ptr, &pngenc->png_info_ptr);
310 GST_ELEMENT_ERROR (pngenc, LIBRARY, FAILED, (NULL),
311 ("returning from longjmp"));
312 ret = GST_FLOW_ERROR;
316 png_set_filter (pngenc->png_struct_ptr, 0,
317 PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE);
318 png_set_compression_level (pngenc->png_struct_ptr, pngenc->compression_level);
320 png_set_IHDR (pngenc->png_struct_ptr,
321 pngenc->png_info_ptr,
325 pngenc->png_color_type,
327 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
329 png_set_write_fn (pngenc->png_struct_ptr, pngenc,
330 (png_rw_ptr) user_write_data, user_flush_data);
332 row_pointers = g_new (png_byte *, pngenc->height);
334 for (row_index = 0; row_index < pngenc->height; row_index++) {
335 row_pointers[row_index] = GST_VIDEO_FRAME_COMP_DATA (&frame, 0) +
336 (row_index * GST_VIDEO_FRAME_COMP_STRIDE (&frame, 0));
339 /* allocate the output buffer */
341 gst_buffer_new_and_alloc (pngenc->height * pngenc->width);
344 png_write_info (pngenc->png_struct_ptr, pngenc->png_info_ptr);
345 png_write_image (pngenc->png_struct_ptr, row_pointers);
346 png_write_end (pngenc->png_struct_ptr, NULL);
348 g_free (row_pointers);
350 GST_DEBUG_OBJECT (pngenc, "written %d", pngenc->written);
353 gst_buffer_copy_region (pngenc->buffer_out, GST_BUFFER_COPY_MEMORY,
356 png_destroy_info_struct (pngenc->png_struct_ptr, &pngenc->png_info_ptr);
357 png_destroy_write_struct (&pngenc->png_struct_ptr, (png_infopp) NULL);
359 GST_BUFFER_TIMESTAMP (encoded_buf) = GST_BUFFER_TIMESTAMP (buf);
360 GST_BUFFER_DURATION (encoded_buf) = GST_BUFFER_DURATION (buf);
362 if ((ret = gst_pad_push (pngenc->srcpad, encoded_buf)) != GST_FLOW_OK)
365 if (pngenc->snapshot) {
368 GST_DEBUG_OBJECT (pngenc, "snapshot mode, sending EOS");
369 /* send EOS event, since a frame has been pushed out */
370 event = gst_event_new_eos ();
372 gst_pad_push_event (pngenc->srcpad, event);
377 gst_video_frame_unmap (&frame);
379 gst_buffer_unref (buf);
380 GST_DEBUG_OBJECT (pngenc, "END, ret:%d", ret);
382 if (pngenc->buffer_out != NULL) {
383 gst_buffer_unref (pngenc->buffer_out);
384 pngenc->buffer_out = NULL;
391 gst_pngenc_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
396 enc = GST_PNGENC (parent);
398 switch (GST_EVENT_TYPE (event)) {
403 gst_event_parse_caps (event, &caps);
404 res = gst_pngenc_setcaps (enc, caps);
405 gst_event_unref (event);
409 res = gst_pad_push_event (enc->srcpad, event);
416 gst_pngenc_get_property (GObject * object,
417 guint prop_id, GValue * value, GParamSpec * pspec)
421 pngenc = GST_PNGENC (object);
425 g_value_set_boolean (value, pngenc->snapshot);
427 /* case ARG_NEWMEDIA: */
428 /* g_value_set_boolean (value, pngenc->newmedia); */
430 case ARG_COMPRESSION_LEVEL:
431 g_value_set_uint (value, pngenc->compression_level);
434 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
441 gst_pngenc_set_property (GObject * object,
442 guint prop_id, const GValue * value, GParamSpec * pspec)
446 pngenc = GST_PNGENC (object);
450 pngenc->snapshot = g_value_get_boolean (value);
452 /* case ARG_NEWMEDIA: */
453 /* pngenc->newmedia = g_value_get_boolean (value); */
455 case ARG_COMPRESSION_LEVEL:
456 pngenc->compression_level = g_value_get_uint (value);
459 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);