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_start (GstVideoEncoder * encoder);
91 static gboolean gst_pngenc_propose_allocation (GstVideoEncoder * encoder,
94 static void gst_pngenc_finalize (GObject * object);
97 user_error_fn (png_structp png_ptr, png_const_charp error_msg)
99 g_warning ("%s", error_msg);
103 user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
105 g_warning ("%s", warning_msg);
109 gst_pngenc_class_init (GstPngEncClass * klass)
111 GObjectClass *gobject_class;
112 GstElementClass *element_class;
113 GstVideoEncoderClass *venc_class;
115 gobject_class = (GObjectClass *) klass;
116 element_class = (GstElementClass *) klass;
117 venc_class = (GstVideoEncoderClass *) klass;
119 parent_class = g_type_class_peek_parent (klass);
121 gobject_class->get_property = gst_pngenc_get_property;
122 gobject_class->set_property = gst_pngenc_set_property;
124 g_object_class_install_property (gobject_class, ARG_SNAPSHOT,
125 g_param_spec_boolean ("snapshot", "Snapshot",
126 "Send EOS after encoding a frame, useful for snapshots",
127 DEFAULT_SNAPSHOT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
129 g_object_class_install_property (gobject_class, ARG_COMPRESSION_LEVEL,
130 g_param_spec_uint ("compression-level", "compression-level",
131 "PNG compression level",
132 Z_NO_COMPRESSION, Z_BEST_COMPRESSION,
133 DEFAULT_COMPRESSION_LEVEL,
134 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
136 gst_element_class_add_static_pad_template
137 (element_class, &pngenc_sink_template);
138 gst_element_class_add_static_pad_template
139 (element_class, &pngenc_src_template);
140 gst_element_class_set_static_metadata (element_class, "PNG image encoder",
141 "Codec/Encoder/Image",
142 "Encode a video frame to a .png image",
143 "Jeremy SIMON <jsimon13@yahoo.fr>");
145 venc_class->set_format = gst_pngenc_set_format;
146 venc_class->handle_frame = gst_pngenc_handle_frame;
147 venc_class->propose_allocation = gst_pngenc_propose_allocation;
148 venc_class->flush = gst_pngenc_flush;
149 venc_class->start = gst_pngenc_start;
150 gobject_class->finalize = gst_pngenc_finalize;
152 GST_DEBUG_CATEGORY_INIT (pngenc_debug, "pngenc", 0, "PNG image encoder");
157 gst_pngenc_set_format (GstVideoEncoder * encoder, GstVideoCodecState * state)
162 GstVideoCodecState *output_state;
164 pngenc = GST_PNGENC (encoder);
167 switch (GST_VIDEO_INFO_FORMAT (info)) {
168 case GST_VIDEO_FORMAT_RGBA:
169 pngenc->png_color_type = PNG_COLOR_TYPE_RGBA;
171 case GST_VIDEO_FORMAT_RGB:
172 pngenc->png_color_type = PNG_COLOR_TYPE_RGB;
174 case GST_VIDEO_FORMAT_GRAY8:
175 case GST_VIDEO_FORMAT_GRAY16_BE:
176 pngenc->png_color_type = PNG_COLOR_TYPE_GRAY;
183 switch (GST_VIDEO_INFO_FORMAT (info)) {
184 case GST_VIDEO_FORMAT_GRAY16_BE:
187 default: /* GST_VIDEO_FORMAT_RGB and GST_VIDEO_FORMAT_GRAY8 */
192 if (pngenc->input_state)
193 gst_video_codec_state_unref (pngenc->input_state);
194 pngenc->input_state = gst_video_codec_state_ref (state);
197 gst_video_encoder_set_output_state (encoder,
198 gst_caps_new_empty_simple ("image/png"), state);
199 gst_video_codec_state_unref (output_state);
207 gst_pngenc_init (GstPngEnc * pngenc)
209 GST_PAD_SET_ACCEPT_TEMPLATE (GST_VIDEO_ENCODER_SINK_PAD (pngenc));
212 pngenc->png_struct_ptr = NULL;
213 pngenc->png_info_ptr = NULL;
215 pngenc->snapshot = DEFAULT_SNAPSHOT;
216 pngenc->compression_level = DEFAULT_COMPRESSION_LEVEL;
220 gst_pngenc_finalize (GObject * object)
222 GstPngEnc *pngenc = GST_PNGENC (object);
224 if (pngenc->input_state)
225 gst_video_codec_state_unref (pngenc->input_state);
227 G_OBJECT_CLASS (parent_class)->finalize (object);
231 user_flush_data (png_structp png_ptr G_GNUC_UNUSED)
236 user_write_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
242 pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
244 mem = gst_allocator_alloc (NULL, length, NULL);
246 GST_ERROR_OBJECT (pngenc, "Failed to allocate memory");
247 png_error (png_ptr, "Failed to allocate memory");
253 if (!gst_memory_map (mem, &minfo, GST_MAP_WRITE)) {
254 GST_ERROR_OBJECT (pngenc, "Failed to map memory");
255 gst_memory_unref (mem);
257 png_error (png_ptr, "Failed to map memory");
263 memcpy (minfo.data, data, length);
264 gst_memory_unmap (mem, &minfo);
266 gst_buffer_append_memory (pngenc->buffer_out, mem);
270 gst_pngenc_flush (GstVideoEncoder * encoder)
272 GstPngEnc *pngenc = GST_PNGENC (encoder);
274 pngenc->frame_count = 0;
280 gst_pngenc_start (GstVideoEncoder * encoder)
282 GstPngEnc *pngenc = GST_PNGENC (encoder);
284 pngenc->frame_count = 0;
290 gst_pngenc_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame)
294 png_byte **row_pointers;
295 GstFlowReturn ret = GST_FLOW_OK;
297 GstVideoFrame vframe;
299 pngenc = GST_PNGENC (encoder);
301 if (pngenc->snapshot && pngenc->frame_count > 0)
304 info = &pngenc->input_state->info;
306 GST_DEBUG_OBJECT (pngenc, "BEGINNING");
308 /* initialize png struct stuff */
309 pngenc->png_struct_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING,
310 (png_voidp) NULL, user_error_fn, user_warning_fn);
311 if (pngenc->png_struct_ptr == NULL)
312 goto struct_init_fail;
314 pngenc->png_info_ptr = png_create_info_struct (pngenc->png_struct_ptr);
315 if (!pngenc->png_info_ptr)
318 /* non-0 return is from a longjmp inside of libpng */
319 if (setjmp (png_jmpbuf (pngenc->png_struct_ptr)) != 0)
322 png_set_filter (pngenc->png_struct_ptr, 0,
323 PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE);
324 png_set_compression_level (pngenc->png_struct_ptr, pngenc->compression_level);
326 png_set_IHDR (pngenc->png_struct_ptr,
327 pngenc->png_info_ptr,
328 GST_VIDEO_INFO_WIDTH (info),
329 GST_VIDEO_INFO_HEIGHT (info),
331 pngenc->png_color_type,
333 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
335 png_set_write_fn (pngenc->png_struct_ptr, pngenc,
336 (png_rw_ptr) user_write_data, user_flush_data);
338 if (!gst_video_frame_map (&vframe, &pngenc->input_state->info,
339 frame->input_buffer, GST_MAP_READ)) {
340 GST_ELEMENT_ERROR (pngenc, STREAM, FORMAT, (NULL),
341 ("Failed to map video frame, caps problem?"));
342 ret = GST_FLOW_ERROR;
346 row_pointers = g_new (png_byte *, GST_VIDEO_INFO_HEIGHT (info));
348 for (row_index = 0; row_index < GST_VIDEO_INFO_HEIGHT (info); row_index++) {
349 row_pointers[row_index] = GST_VIDEO_FRAME_COMP_DATA (&vframe, 0) +
350 (row_index * GST_VIDEO_FRAME_COMP_STRIDE (&vframe, 0));
353 /* allocate the output buffer */
354 pngenc->buffer_out = gst_buffer_new ();
356 png_write_info (pngenc->png_struct_ptr, pngenc->png_info_ptr);
357 png_write_image (pngenc->png_struct_ptr, row_pointers);
358 png_write_end (pngenc->png_struct_ptr, NULL);
360 g_free (row_pointers);
361 gst_video_frame_unmap (&vframe);
363 png_destroy_info_struct (pngenc->png_struct_ptr, &pngenc->png_info_ptr);
364 png_destroy_write_struct (&pngenc->png_struct_ptr, (png_infopp) NULL);
366 /* Set final size and store */
367 frame->output_buffer = pngenc->buffer_out;
369 pngenc->buffer_out = NULL;
371 GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT (frame);
373 if ((ret = gst_video_encoder_finish_frame (encoder, frame)) != GST_FLOW_OK)
376 ++pngenc->frame_count;
378 if (pngenc->snapshot)
382 GST_DEBUG_OBJECT (pngenc, "END, ret:%d", ret);
389 GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
390 ("Failed to initialize png structure"));
391 return GST_FLOW_ERROR;
396 png_destroy_write_struct (&(pngenc->png_struct_ptr), (png_infopp) NULL);
397 GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
398 ("Failed to initialize the png info structure"));
399 return GST_FLOW_ERROR;
404 png_destroy_write_struct (&pngenc->png_struct_ptr, &pngenc->png_info_ptr);
405 GST_ELEMENT_ERROR (pngenc, LIBRARY, FAILED, (NULL),
406 ("returning from longjmp"));
407 return GST_FLOW_ERROR;
412 gst_pngenc_propose_allocation (GstVideoEncoder * encoder, GstQuery * query)
414 gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL);
416 return GST_VIDEO_ENCODER_CLASS (parent_class)->propose_allocation (encoder,
421 gst_pngenc_get_property (GObject * object,
422 guint prop_id, GValue * value, GParamSpec * pspec)
426 pngenc = GST_PNGENC (object);
430 g_value_set_boolean (value, pngenc->snapshot);
432 case ARG_COMPRESSION_LEVEL:
433 g_value_set_uint (value, pngenc->compression_level);
436 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
443 gst_pngenc_set_property (GObject * object,
444 guint prop_id, const GValue * value, GParamSpec * pspec)
448 pngenc = GST_PNGENC (object);
452 pngenc->snapshot = g_value_get_boolean (value);
454 case ARG_COMPRESSION_LEVEL:
455 pngenc->compression_level = g_value_get_uint (value);
458 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);