gstreamer/ext/libpng/gstpngenc.c
2012-11-04 00:07:18 +00:00

421 lines
11 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* Filter:
* Copyright (C) 2000 Donald A. Graft
*
* Copyright (C) 2012 Collabora Ltd.
* Author : Edward Hervey <edward@collabora.com>
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
/**
* SECTION:element-pngenc
*
* Encodes png images.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include "gstpngenc.h"
#include <gst/video/video.h>
#include <gst/video/gstvideometa.h>
#include <zlib.h>
GST_DEBUG_CATEGORY_STATIC (pngenc_debug);
#define GST_CAT_DEFAULT pngenc_debug
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_SNAPSHOT FALSE
#define DEFAULT_COMPRESSION_LEVEL 6
enum
{
ARG_0,
ARG_SNAPSHOT,
ARG_COMPRESSION_LEVEL
};
static GstStaticPadTemplate pngenc_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/png, "
"width = (int) [ 16, 1000000 ], "
"height = (int) [ 16, 1000000 ], " "framerate = " GST_VIDEO_FPS_RANGE)
);
static GstStaticPadTemplate pngenc_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ RGBA, RGB, GRAY8, GRAY16_BE }"))
);
#define parent_class gst_pngenc_parent_class
G_DEFINE_TYPE (GstPngEnc, gst_pngenc, GST_TYPE_VIDEO_ENCODER);
static void gst_pngenc_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_pngenc_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_pngenc_handle_frame (GstVideoEncoder * encoder,
GstVideoCodecFrame * frame);
static gboolean gst_pngenc_set_format (GstVideoEncoder * encoder,
GstVideoCodecState * state);
static gboolean gst_pngenc_propose_allocation (GstVideoEncoder * encoder,
GstQuery * query);
static void gst_pngenc_finalize (GObject * object);
static void
user_error_fn (png_structp png_ptr, png_const_charp error_msg)
{
g_warning ("%s", error_msg);
}
static void
user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
{
g_warning ("%s", warning_msg);
}
static void
gst_pngenc_class_init (GstPngEncClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstVideoEncoderClass *venc_class;
gobject_class = (GObjectClass *) klass;
element_class = (GstElementClass *) klass;
venc_class = (GstVideoEncoderClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->get_property = gst_pngenc_get_property;
gobject_class->set_property = gst_pngenc_set_property;
g_object_class_install_property (gobject_class, ARG_SNAPSHOT,
g_param_spec_boolean ("snapshot", "Snapshot",
"Send EOS after encoding a frame, useful for snapshots",
DEFAULT_SNAPSHOT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_COMPRESSION_LEVEL,
g_param_spec_uint ("compression-level", "compression-level",
"PNG compression level",
Z_NO_COMPRESSION, Z_BEST_COMPRESSION,
DEFAULT_COMPRESSION_LEVEL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_pad_template
(element_class, gst_static_pad_template_get (&pngenc_sink_template));
gst_element_class_add_pad_template
(element_class, gst_static_pad_template_get (&pngenc_src_template));
gst_element_class_set_static_metadata (element_class, "PNG image encoder",
"Codec/Encoder/Image",
"Encode a video frame to a .png image",
"Jeremy SIMON <jsimon13@yahoo.fr>");
venc_class->set_format = gst_pngenc_set_format;
venc_class->handle_frame = gst_pngenc_handle_frame;
venc_class->propose_allocation = gst_pngenc_propose_allocation;
gobject_class->finalize = gst_pngenc_finalize;
GST_DEBUG_CATEGORY_INIT (pngenc_debug, "pngenc", 0, "PNG image encoder");
}
static gboolean
gst_pngenc_set_format (GstVideoEncoder * encoder, GstVideoCodecState * state)
{
GstPngEnc *pngenc;
gboolean ret = TRUE;
GstVideoInfo *info;
GstVideoCodecState *output_state;
pngenc = GST_PNGENC (encoder);
info = &state->info;
switch (GST_VIDEO_INFO_FORMAT (info)) {
case GST_VIDEO_FORMAT_RGBA:
pngenc->png_color_type = PNG_COLOR_TYPE_RGBA;
break;
case GST_VIDEO_FORMAT_RGB:
pngenc->png_color_type = PNG_COLOR_TYPE_RGB;
break;
case GST_VIDEO_FORMAT_GRAY8:
case GST_VIDEO_FORMAT_GRAY16_BE:
pngenc->png_color_type = PNG_COLOR_TYPE_GRAY;
break;
default:
ret = FALSE;
goto done;
}
switch (GST_VIDEO_INFO_FORMAT (info)) {
case GST_VIDEO_FORMAT_GRAY16_BE:
pngenc->depth = 16;
break;
default: /* GST_VIDEO_FORMAT_RGB and GST_VIDEO_FORMAT_GRAY8 */
pngenc->depth = 8;
break;
}
if (pngenc->input_state)
gst_video_codec_state_unref (pngenc->input_state);
pngenc->input_state = gst_video_codec_state_ref (state);
output_state =
gst_video_encoder_set_output_state (encoder,
gst_caps_new_empty_simple ("image/png"), state);
gst_video_codec_state_unref (output_state);
done:
return ret;
}
static void
gst_pngenc_init (GstPngEnc * pngenc)
{
/* init settings */
pngenc->png_struct_ptr = NULL;
pngenc->png_info_ptr = NULL;
pngenc->snapshot = DEFAULT_SNAPSHOT;
pngenc->compression_level = DEFAULT_COMPRESSION_LEVEL;
}
static void
gst_pngenc_finalize (GObject * object)
{
GstPngEnc *pngenc = GST_PNGENC (object);
if (pngenc->input_state)
gst_video_codec_state_unref (pngenc->input_state);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
user_flush_data (png_structp png_ptr G_GNUC_UNUSED)
{
}
static void
user_write_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
{
GstPngEnc *pngenc;
GstMemory *mem;
GstMapInfo minfo;
pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
mem = gst_allocator_alloc (NULL, length, NULL);
if (!mem) {
GST_ERROR_OBJECT (pngenc, "Failed to allocate memory");
png_error (png_ptr, "Failed to allocate memory");
/* never reached */
return;
}
if (!gst_memory_map (mem, &minfo, GST_MAP_WRITE)) {
GST_ERROR_OBJECT (pngenc, "Failed to map memory");
gst_memory_unref (mem);
png_error (png_ptr, "Failed to map memory");
/* never reached */
return;
}
memcpy (minfo.data, data, length);
gst_memory_unmap (mem, &minfo);
gst_buffer_append_memory (pngenc->buffer_out, mem);
}
static GstFlowReturn
gst_pngenc_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame)
{
GstPngEnc *pngenc;
gint row_index;
png_byte **row_pointers;
GstFlowReturn ret = GST_FLOW_OK;
GstVideoInfo *info;
GstVideoFrame vframe;
pngenc = GST_PNGENC (encoder);
info = &pngenc->input_state->info;
GST_DEBUG_OBJECT (pngenc, "BEGINNING");
/* initialize png struct stuff */
pngenc->png_struct_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING,
(png_voidp) NULL, user_error_fn, user_warning_fn);
if (pngenc->png_struct_ptr == NULL)
goto struct_init_fail;
pngenc->png_info_ptr = png_create_info_struct (pngenc->png_struct_ptr);
if (!pngenc->png_info_ptr)
goto png_info_fail;
/* non-0 return is from a longjmp inside of libpng */
if (setjmp (png_jmpbuf (pngenc->png_struct_ptr)) != 0)
goto longjmp_fail;
png_set_filter (pngenc->png_struct_ptr, 0,
PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE);
png_set_compression_level (pngenc->png_struct_ptr, pngenc->compression_level);
png_set_IHDR (pngenc->png_struct_ptr,
pngenc->png_info_ptr,
GST_VIDEO_INFO_WIDTH (info),
GST_VIDEO_INFO_HEIGHT (info),
pngenc->depth,
pngenc->png_color_type,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_set_write_fn (pngenc->png_struct_ptr, pngenc,
(png_rw_ptr) user_write_data, user_flush_data);
row_pointers = g_new (png_byte *, GST_VIDEO_INFO_HEIGHT (info));
if (!gst_video_frame_map (&vframe, &pngenc->input_state->info,
frame->input_buffer, GST_MAP_READ)) {
GST_ELEMENT_ERROR (pngenc, STREAM, FORMAT, (NULL),
("Failed to map video frame, caps problem?"));
ret = GST_FLOW_ERROR;
goto done;
}
for (row_index = 0; row_index < GST_VIDEO_INFO_HEIGHT (info); row_index++) {
row_pointers[row_index] = GST_VIDEO_FRAME_COMP_DATA (&vframe, 0) +
(row_index * GST_VIDEO_FRAME_COMP_STRIDE (&vframe, 0));
}
/* allocate the output buffer */
pngenc->buffer_out = gst_buffer_new ();
png_write_info (pngenc->png_struct_ptr, pngenc->png_info_ptr);
png_write_image (pngenc->png_struct_ptr, row_pointers);
png_write_end (pngenc->png_struct_ptr, NULL);
g_free (row_pointers);
png_destroy_info_struct (pngenc->png_struct_ptr, &pngenc->png_info_ptr);
png_destroy_write_struct (&pngenc->png_struct_ptr, (png_infopp) NULL);
/* Set final size and store */
frame->output_buffer = pngenc->buffer_out;
pngenc->buffer_out = NULL;
if ((ret = gst_video_encoder_finish_frame (encoder, frame)) != GST_FLOW_OK)
goto done;
if (pngenc->snapshot)
ret = GST_FLOW_EOS;
done:
GST_DEBUG_OBJECT (pngenc, "END, ret:%d", ret);
return ret;
/* ERRORS */
struct_init_fail:
{
GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
("Failed to initialize png structure"));
return GST_FLOW_ERROR;
}
png_info_fail:
{
png_destroy_write_struct (&(pngenc->png_struct_ptr), (png_infopp) NULL);
GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
("Failed to initialize the png info structure"));
return GST_FLOW_ERROR;
}
longjmp_fail:
{
png_destroy_write_struct (&pngenc->png_struct_ptr, &pngenc->png_info_ptr);
GST_ELEMENT_ERROR (pngenc, LIBRARY, FAILED, (NULL),
("returning from longjmp"));
return GST_FLOW_ERROR;
}
}
static gboolean
gst_pngenc_propose_allocation (GstVideoEncoder * encoder, GstQuery * query)
{
gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL);
return GST_VIDEO_ENCODER_CLASS (parent_class)->propose_allocation (encoder,
query);
}
static void
gst_pngenc_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstPngEnc *pngenc;
pngenc = GST_PNGENC (object);
switch (prop_id) {
case ARG_SNAPSHOT:
g_value_set_boolean (value, pngenc->snapshot);
break;
case ARG_COMPRESSION_LEVEL:
g_value_set_uint (value, pngenc->compression_level);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_pngenc_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstPngEnc *pngenc;
pngenc = GST_PNGENC (object);
switch (prop_id) {
case ARG_SNAPSHOT:
pngenc->snapshot = g_value_get_boolean (value);
break;
case ARG_COMPRESSION_LEVEL:
pngenc->compression_level = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}