2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
5 * Copyright (C) 2000 Donald A. Graft
7 * Copyright (C) 2012 Collabora Ltd.
8 * Author : Edward Hervey <edward@collabora.com>
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.
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.
22 * SECTION:element-pngenc
33 #include <gst/video/video.h>
34 #include <gst/video/gstvideometa.h>
37 #include "gstpngenc.h"
39 GST_DEBUG_CATEGORY_STATIC (pngenc_debug);
40 #define GST_CAT_DEFAULT pngenc_debug
42 /* Filter signals and args */
49 #define DEFAULT_SNAPSHOT FALSE
50 #define DEFAULT_COMPRESSION_LEVEL 6
59 static GstStaticPadTemplate pngenc_src_template =
60 GST_STATIC_PAD_TEMPLATE ("src",
63 GST_STATIC_CAPS ("image/png, "
64 "width = (int) [ 1, 1000000 ], "
65 "height = (int) [ 1, 1000000 ], " "framerate = " GST_VIDEO_FPS_RANGE)
68 static GstStaticPadTemplate pngenc_sink_template =
69 GST_STATIC_PAD_TEMPLATE ("sink",
72 GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ RGBA, RGB, GRAY8, GRAY16_BE }"))
75 #define parent_class gst_pngenc_parent_class
76 G_DEFINE_TYPE (GstPngEnc, gst_pngenc, GST_TYPE_VIDEO_ENCODER);
77 GST_ELEMENT_REGISTER_DEFINE (pngenc, "pngenc", GST_RANK_PRIMARY,
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_handle_frame (GstVideoEncoder * encoder,
86 GstVideoCodecFrame * frame);
87 static gboolean gst_pngenc_set_format (GstVideoEncoder * encoder,
88 GstVideoCodecState * state);
89 static gboolean gst_pngenc_flush (GstVideoEncoder * encoder);
90 static gboolean gst_pngenc_propose_allocation (GstVideoEncoder * encoder,
93 static void gst_pngenc_finalize (GObject * object);
96 user_error_fn (png_structp png_ptr, png_const_charp error_msg)
98 g_warning ("%s", error_msg);
102 user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
104 g_warning ("%s", warning_msg);
108 gst_pngenc_class_init (GstPngEncClass * klass)
110 GObjectClass *gobject_class;
111 GstElementClass *element_class;
112 GstVideoEncoderClass *venc_class;
114 gobject_class = (GObjectClass *) klass;
115 element_class = (GstElementClass *) klass;
116 venc_class = (GstVideoEncoderClass *) klass;
118 parent_class = g_type_class_peek_parent (klass);
120 gobject_class->get_property = gst_pngenc_get_property;
121 gobject_class->set_property = gst_pngenc_set_property;
123 g_object_class_install_property (gobject_class, ARG_SNAPSHOT,
124 g_param_spec_boolean ("snapshot", "Snapshot",
125 "Send EOS after encoding a frame, useful for snapshots",
126 DEFAULT_SNAPSHOT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
128 g_object_class_install_property (gobject_class, ARG_COMPRESSION_LEVEL,
129 g_param_spec_uint ("compression-level", "compression-level",
130 "PNG compression level",
131 Z_NO_COMPRESSION, Z_BEST_COMPRESSION,
132 DEFAULT_COMPRESSION_LEVEL,
133 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
135 gst_element_class_add_static_pad_template
136 (element_class, &pngenc_sink_template);
137 gst_element_class_add_static_pad_template
138 (element_class, &pngenc_src_template);
139 gst_element_class_set_static_metadata (element_class, "PNG image encoder",
140 "Codec/Encoder/Image",
141 "Encode a video frame to a .png image",
142 "Jeremy SIMON <jsimon13@yahoo.fr>");
144 venc_class->set_format = gst_pngenc_set_format;
145 venc_class->handle_frame = gst_pngenc_handle_frame;
146 venc_class->propose_allocation = gst_pngenc_propose_allocation;
147 venc_class->flush = gst_pngenc_flush;
148 gobject_class->finalize = gst_pngenc_finalize;
150 GST_DEBUG_CATEGORY_INIT (pngenc_debug, "pngenc", 0, "PNG image encoder");
155 gst_pngenc_set_format (GstVideoEncoder * encoder, GstVideoCodecState * state)
160 GstVideoCodecState *output_state;
162 pngenc = GST_PNGENC (encoder);
165 switch (GST_VIDEO_INFO_FORMAT (info)) {
166 case GST_VIDEO_FORMAT_RGBA:
167 pngenc->png_color_type = PNG_COLOR_TYPE_RGBA;
169 case GST_VIDEO_FORMAT_RGB:
170 pngenc->png_color_type = PNG_COLOR_TYPE_RGB;
172 case GST_VIDEO_FORMAT_GRAY8:
173 case GST_VIDEO_FORMAT_GRAY16_BE:
174 pngenc->png_color_type = PNG_COLOR_TYPE_GRAY;
181 switch (GST_VIDEO_INFO_FORMAT (info)) {
182 case GST_VIDEO_FORMAT_GRAY16_BE:
185 default: /* GST_VIDEO_FORMAT_RGB and GST_VIDEO_FORMAT_GRAY8 */
190 if (pngenc->input_state)
191 gst_video_codec_state_unref (pngenc->input_state);
192 pngenc->input_state = gst_video_codec_state_ref (state);
195 gst_video_encoder_set_output_state (encoder,
196 gst_caps_new_empty_simple ("image/png"), state);
197 gst_video_codec_state_unref (output_state);
205 gst_pngenc_init (GstPngEnc * pngenc)
207 GST_PAD_SET_ACCEPT_TEMPLATE (GST_VIDEO_ENCODER_SINK_PAD (pngenc));
210 pngenc->png_struct_ptr = NULL;
211 pngenc->png_info_ptr = NULL;
213 pngenc->snapshot = DEFAULT_SNAPSHOT;
214 pngenc->compression_level = DEFAULT_COMPRESSION_LEVEL;
218 gst_pngenc_finalize (GObject * object)
220 GstPngEnc *pngenc = GST_PNGENC (object);
222 if (pngenc->input_state)
223 gst_video_codec_state_unref (pngenc->input_state);
225 G_OBJECT_CLASS (parent_class)->finalize (object);
229 user_flush_data (png_structp png_ptr G_GNUC_UNUSED)
234 user_write_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
240 pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
242 mem = gst_allocator_alloc (NULL, length, NULL);
244 GST_ERROR_OBJECT (pngenc, "Failed to allocate memory");
245 png_error (png_ptr, "Failed to allocate memory");
251 if (!gst_memory_map (mem, &minfo, GST_MAP_WRITE)) {
252 GST_ERROR_OBJECT (pngenc, "Failed to map memory");
253 gst_memory_unref (mem);
255 png_error (png_ptr, "Failed to map memory");
261 memcpy (minfo.data, data, length);
262 gst_memory_unmap (mem, &minfo);
264 gst_buffer_append_memory (pngenc->buffer_out, mem);
268 gst_pngenc_flush (GstVideoEncoder * encoder)
270 GstPngEnc *pngenc = GST_PNGENC (encoder);
272 pngenc->frame_count = 0;
278 gst_pngenc_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame)
282 png_byte **row_pointers;
283 GstFlowReturn ret = GST_FLOW_OK;
285 GstVideoFrame vframe;
287 pngenc = GST_PNGENC (encoder);
289 if (pngenc->snapshot && pngenc->frame_count > 0)
292 info = &pngenc->input_state->info;
294 GST_DEBUG_OBJECT (pngenc, "BEGINNING");
296 /* initialize png struct stuff */
297 pngenc->png_struct_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING,
298 (png_voidp) NULL, user_error_fn, user_warning_fn);
299 if (pngenc->png_struct_ptr == NULL)
300 goto struct_init_fail;
302 pngenc->png_info_ptr = png_create_info_struct (pngenc->png_struct_ptr);
303 if (!pngenc->png_info_ptr)
306 /* non-0 return is from a longjmp inside of libpng */
307 if (setjmp (png_jmpbuf (pngenc->png_struct_ptr)) != 0)
310 png_set_filter (pngenc->png_struct_ptr, 0,
311 PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE);
312 png_set_compression_level (pngenc->png_struct_ptr, pngenc->compression_level);
314 png_set_IHDR (pngenc->png_struct_ptr,
315 pngenc->png_info_ptr,
316 GST_VIDEO_INFO_WIDTH (info),
317 GST_VIDEO_INFO_HEIGHT (info),
319 pngenc->png_color_type,
321 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
323 png_set_write_fn (pngenc->png_struct_ptr, pngenc,
324 (png_rw_ptr) user_write_data, user_flush_data);
326 if (!gst_video_frame_map (&vframe, &pngenc->input_state->info,
327 frame->input_buffer, GST_MAP_READ)) {
328 GST_ELEMENT_ERROR (pngenc, STREAM, FORMAT, (NULL),
329 ("Failed to map video frame, caps problem?"));
330 ret = GST_FLOW_ERROR;
334 row_pointers = g_new (png_byte *, GST_VIDEO_INFO_HEIGHT (info));
336 for (row_index = 0; row_index < GST_VIDEO_INFO_HEIGHT (info); row_index++) {
337 row_pointers[row_index] = GST_VIDEO_FRAME_COMP_DATA (&vframe, 0) +
338 (row_index * GST_VIDEO_FRAME_COMP_STRIDE (&vframe, 0));
341 /* allocate the output buffer */
342 pngenc->buffer_out = gst_buffer_new ();
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);
349 gst_video_frame_unmap (&vframe);
351 png_destroy_info_struct (pngenc->png_struct_ptr, &pngenc->png_info_ptr);
352 png_destroy_write_struct (&pngenc->png_struct_ptr, (png_infopp) NULL);
354 /* Set final size and store */
355 frame->output_buffer = pngenc->buffer_out;
357 pngenc->buffer_out = NULL;
359 if ((ret = gst_video_encoder_finish_frame (encoder, frame)) != GST_FLOW_OK)
362 ++pngenc->frame_count;
364 if (pngenc->snapshot)
368 GST_DEBUG_OBJECT (pngenc, "END, ret:%d", ret);
375 GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
376 ("Failed to initialize png structure"));
377 return GST_FLOW_ERROR;
382 png_destroy_write_struct (&(pngenc->png_struct_ptr), (png_infopp) NULL);
383 GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
384 ("Failed to initialize the png info structure"));
385 return GST_FLOW_ERROR;
390 png_destroy_write_struct (&pngenc->png_struct_ptr, &pngenc->png_info_ptr);
391 GST_ELEMENT_ERROR (pngenc, LIBRARY, FAILED, (NULL),
392 ("returning from longjmp"));
393 return GST_FLOW_ERROR;
398 gst_pngenc_propose_allocation (GstVideoEncoder * encoder, GstQuery * query)
400 gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL);
402 return GST_VIDEO_ENCODER_CLASS (parent_class)->propose_allocation (encoder,
407 gst_pngenc_get_property (GObject * object,
408 guint prop_id, GValue * value, GParamSpec * pspec)
412 pngenc = GST_PNGENC (object);
416 g_value_set_boolean (value, pngenc->snapshot);
418 case ARG_COMPRESSION_LEVEL:
419 g_value_set_uint (value, pngenc->compression_level);
422 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
429 gst_pngenc_set_property (GObject * object,
430 guint prop_id, const GValue * value, GParamSpec * pspec)
434 pngenc = GST_PNGENC (object);
438 pngenc->snapshot = g_value_get_boolean (value);
440 case ARG_COMPRESSION_LEVEL:
441 pngenc->compression_level = g_value_get_uint (value);
444 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);