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526 lines
14 KiB
C
526 lines
14 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* Filter:
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* Copyright (C) 2000 Donald A. Graft
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*
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* Copyright (C) 2012 Collabora Ltd.
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* Author : Edward Hervey <edward@collabora.com>
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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/**
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* SECTION:element-pngenc
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* @title: pngenc
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*
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* Encodes png images.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include <gst/video/gstvideometa.h>
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#include <zlib.h>
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#include "gstpngenc.h"
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GST_DEBUG_CATEGORY_STATIC (pngenc_debug);
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#define GST_CAT_DEFAULT pngenc_debug
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/* Filter signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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#define DEFAULT_SNAPSHOT FALSE
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#define DEFAULT_COMPRESSION_LEVEL 6
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enum
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{
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ARG_0,
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ARG_SNAPSHOT,
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ARG_COMPRESSION_LEVEL
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};
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static GstStaticPadTemplate pngenc_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("image/png, "
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"width = (int) [ 1, 1000000 ], "
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"height = (int) [ 1, 1000000 ], " "framerate = " GST_VIDEO_FPS_RANGE)
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);
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static GstStaticPadTemplate pngenc_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ RGBA, RGB, GRAY8, GRAY16_BE }"))
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);
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#define parent_class gst_pngenc_parent_class
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G_DEFINE_TYPE (GstPngEnc, gst_pngenc, GST_TYPE_VIDEO_ENCODER);
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GST_ELEMENT_REGISTER_DEFINE (pngenc, "pngenc", GST_RANK_PRIMARY,
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GST_TYPE_PNGENC);
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static void gst_pngenc_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_pngenc_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_pngenc_handle_frame (GstVideoEncoder * encoder,
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GstVideoCodecFrame * frame);
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static gboolean gst_pngenc_set_format (GstVideoEncoder * encoder,
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GstVideoCodecState * state);
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static gboolean gst_pngenc_flush (GstVideoEncoder * encoder);
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static gboolean gst_pngenc_start (GstVideoEncoder * encoder);
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static gboolean gst_pngenc_propose_allocation (GstVideoEncoder * encoder,
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GstQuery * query);
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static void gst_pngenc_finalize (GObject * object);
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static void
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user_error_fn (png_structp png_ptr, png_const_charp error_msg)
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{
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g_warning ("%s", error_msg);
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}
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static void
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user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
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{
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g_warning ("%s", warning_msg);
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}
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static void
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gst_pngenc_class_init (GstPngEncClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *element_class;
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GstVideoEncoderClass *venc_class;
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gobject_class = (GObjectClass *) klass;
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element_class = (GstElementClass *) klass;
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venc_class = (GstVideoEncoderClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->get_property = gst_pngenc_get_property;
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gobject_class->set_property = gst_pngenc_set_property;
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g_object_class_install_property (gobject_class, ARG_SNAPSHOT,
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g_param_spec_boolean ("snapshot", "Snapshot",
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"Send EOS after encoding a frame, useful for snapshots",
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DEFAULT_SNAPSHOT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, ARG_COMPRESSION_LEVEL,
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g_param_spec_uint ("compression-level", "compression-level",
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"PNG compression level",
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Z_NO_COMPRESSION, Z_BEST_COMPRESSION,
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DEFAULT_COMPRESSION_LEVEL,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gst_element_class_add_static_pad_template
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(element_class, &pngenc_sink_template);
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gst_element_class_add_static_pad_template
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(element_class, &pngenc_src_template);
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gst_element_class_set_static_metadata (element_class, "PNG image encoder",
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"Codec/Encoder/Image",
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"Encode a video frame to a .png image",
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"Jeremy SIMON <jsimon13@yahoo.fr>");
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venc_class->set_format = gst_pngenc_set_format;
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venc_class->handle_frame = gst_pngenc_handle_frame;
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venc_class->propose_allocation = gst_pngenc_propose_allocation;
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venc_class->flush = gst_pngenc_flush;
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venc_class->start = gst_pngenc_start;
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gobject_class->finalize = gst_pngenc_finalize;
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GST_DEBUG_CATEGORY_INIT (pngenc_debug, "pngenc", 0, "PNG image encoder");
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}
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static gboolean
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gst_pngenc_set_format (GstVideoEncoder * encoder, GstVideoCodecState * state)
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{
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GstPngEnc *pngenc;
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gboolean ret = TRUE;
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GstVideoInfo *info;
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GstVideoCodecState *output_state;
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pngenc = GST_PNGENC (encoder);
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info = &state->info;
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switch (GST_VIDEO_INFO_FORMAT (info)) {
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case GST_VIDEO_FORMAT_RGBA:
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pngenc->png_color_type = PNG_COLOR_TYPE_RGBA;
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break;
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case GST_VIDEO_FORMAT_RGB:
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pngenc->png_color_type = PNG_COLOR_TYPE_RGB;
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break;
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case GST_VIDEO_FORMAT_GRAY8:
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case GST_VIDEO_FORMAT_GRAY16_BE:
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pngenc->png_color_type = PNG_COLOR_TYPE_GRAY;
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break;
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default:
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ret = FALSE;
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goto done;
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}
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switch (GST_VIDEO_INFO_FORMAT (info)) {
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case GST_VIDEO_FORMAT_GRAY16_BE:
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pngenc->depth = 16;
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break;
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default: /* GST_VIDEO_FORMAT_RGB and GST_VIDEO_FORMAT_GRAY8 */
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pngenc->depth = 8;
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break;
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}
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if (pngenc->input_state)
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gst_video_codec_state_unref (pngenc->input_state);
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pngenc->input_state = gst_video_codec_state_ref (state);
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output_state =
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gst_video_encoder_set_output_state (encoder,
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gst_caps_new_empty_simple ("image/png"), state);
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gst_video_codec_state_unref (output_state);
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done:
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return ret;
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}
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static void
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gst_pngenc_init (GstPngEnc * pngenc)
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{
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GST_PAD_SET_ACCEPT_TEMPLATE (GST_VIDEO_ENCODER_SINK_PAD (pngenc));
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/* init settings */
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pngenc->png_struct_ptr = NULL;
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pngenc->png_info_ptr = NULL;
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pngenc->snapshot = DEFAULT_SNAPSHOT;
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pngenc->compression_level = DEFAULT_COMPRESSION_LEVEL;
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}
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static void
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gst_pngenc_finalize (GObject * object)
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{
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GstPngEnc *pngenc = GST_PNGENC (object);
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if (pngenc->input_state)
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gst_video_codec_state_unref (pngenc->input_state);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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user_flush_data (png_structp png_ptr G_GNUC_UNUSED)
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{
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}
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/* Copied from glib/gutilsprivate.h
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*
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* Returns the smallest power of 2 greater than or equal to n,
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* or 0 if such power does not fit in a gsize
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*/
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static inline gsize
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gst_pngenc_g_nearest_pow (gsize num)
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{
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gsize n = num - 1;
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g_assert (num > 0 && num <= G_MAXSIZE / 2);
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n |= n >> 1;
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n |= n >> 2;
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n |= n >> 4;
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n |= n >> 8;
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n |= n >> 16;
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#if GLIB_SIZEOF_SIZE_T == 8
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n |= n >> 32;
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#endif
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return n + 1;
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}
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static void
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ensure_memory_is_enough (GstPngEnc * pngenc, unsigned int extra_length)
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{
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GstMemory *new_memory;
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GstMapInfo map;
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gsize old_size, desired_size;
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guint8 *new_data;
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old_size = pngenc->output_map.size;
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desired_size = gst_pngenc_g_nearest_pow (old_size + extra_length);
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g_assert (desired_size != 0);
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/* Our output memory wasn't big enough.
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* Make a new memory that's twice the size, */
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new_memory = gst_allocator_alloc (NULL, desired_size, NULL);
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gst_memory_map (new_memory, &map, GST_MAP_READWRITE);
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new_data = map.data;
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/* copy previous data */
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memcpy (new_data, pngenc->output_map.data, old_size);
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gst_memory_unmap (pngenc->output_mem, &pngenc->output_map);
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gst_memory_unref (pngenc->output_mem);
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/* drop it into place, */
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pngenc->output_mem = new_memory;
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pngenc->output_map = map;
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}
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static void
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user_write_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
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{
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GstPngEnc *pngenc;
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pngenc = (GstPngEnc *) png_get_io_ptr (png_ptr);
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GST_TRACE_OBJECT (pngenc,
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"Memory size: %" G_GSIZE_FORMAT "\nLength to be written: %u",
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pngenc->output_map.size, length);
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if (pngenc->output_map.size > G_MAXSIZE - length) {
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GST_ERROR_OBJECT (pngenc,
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"Memory buffer would overflow after the png write, aborting.");
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png_error (png_ptr, "Buffer would overflow, aborting the write.");
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/* never reached */
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/* libpng will longjmp and we will catch it later on */
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return;
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}
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if ((pngenc->output_mem_pos + length) > pngenc->output_map.size) {
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GST_INFO_OBJECT (pngenc, "Memory not enough, Allocating more.");
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ensure_memory_is_enough (pngenc, length);
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}
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memcpy (&pngenc->output_map.data[pngenc->output_mem_pos], data, length);
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pngenc->output_mem_pos += length;
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}
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static gboolean
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gst_pngenc_flush (GstVideoEncoder * encoder)
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{
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GstPngEnc *pngenc = GST_PNGENC (encoder);
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pngenc->frame_count = 0;
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return TRUE;
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}
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static gboolean
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gst_pngenc_start (GstVideoEncoder * encoder)
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{
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GstPngEnc *pngenc = GST_PNGENC (encoder);
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pngenc->frame_count = 0;
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return TRUE;
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}
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static GstFlowReturn
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gst_pngenc_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame)
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{
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GstPngEnc *pngenc;
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gint row_index;
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png_byte **row_pointers;
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GstFlowReturn ret = GST_FLOW_OK;
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const GstVideoInfo *info;
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GstVideoFrame vframe;
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gsize memory_size;
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GstBuffer *outbuf;
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pngenc = GST_PNGENC (encoder);
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if (pngenc->snapshot && pngenc->frame_count > 0)
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return GST_FLOW_EOS;
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info = &pngenc->input_state->info;
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GST_DEBUG_OBJECT (pngenc, "BEGINNING");
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/* initialize png struct stuff */
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pngenc->png_struct_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING,
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(png_voidp) NULL, user_error_fn, user_warning_fn);
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if (pngenc->png_struct_ptr == NULL)
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goto struct_init_fail;
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pngenc->png_info_ptr = png_create_info_struct (pngenc->png_struct_ptr);
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if (!pngenc->png_info_ptr)
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goto png_info_fail;
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/* non-0 return is from a longjmp inside of libpng */
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if (setjmp (png_jmpbuf (pngenc->png_struct_ptr)) != 0)
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goto longjmp_fail;
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png_set_filter (pngenc->png_struct_ptr, 0,
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PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE);
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png_set_compression_level (pngenc->png_struct_ptr, pngenc->compression_level);
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png_set_IHDR (pngenc->png_struct_ptr,
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pngenc->png_info_ptr,
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GST_VIDEO_INFO_WIDTH (info),
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GST_VIDEO_INFO_HEIGHT (info),
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pngenc->depth,
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pngenc->png_color_type,
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PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
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png_set_write_fn (pngenc->png_struct_ptr, pngenc,
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(png_rw_ptr) user_write_data, user_flush_data);
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if (!gst_video_frame_map (&vframe, &pngenc->input_state->info,
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frame->input_buffer, GST_MAP_READ)) {
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GST_ELEMENT_ERROR (pngenc, STREAM, FORMAT, (NULL),
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("Failed to map video frame, caps problem?"));
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ret = GST_FLOW_ERROR;
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goto done;
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}
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row_pointers = g_new (png_byte *, GST_VIDEO_INFO_HEIGHT (info));
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for (row_index = 0; row_index < GST_VIDEO_INFO_HEIGHT (info); row_index++) {
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row_pointers[row_index] = GST_VIDEO_FRAME_COMP_DATA (&vframe, 0) +
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(row_index * GST_VIDEO_FRAME_COMP_STRIDE (&vframe, 0));
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}
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/* allocate the output buffer */
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pngenc->output_mem_pos = 0;
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pngenc->output_mem =
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gst_allocator_alloc (NULL, MAX (4096, GST_VIDEO_INFO_SIZE (info)), NULL);
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if (!pngenc->output_mem) {
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GST_ERROR_OBJECT (pngenc, "Failed to allocate memory");
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return GST_FLOW_ERROR;
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}
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gst_memory_map (pngenc->output_mem, &pngenc->output_map, GST_MAP_READWRITE);
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png_write_info (pngenc->png_struct_ptr, pngenc->png_info_ptr);
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png_write_image (pngenc->png_struct_ptr, row_pointers);
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png_write_end (pngenc->png_struct_ptr, NULL);
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g_free (row_pointers);
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gst_video_frame_unmap (&vframe);
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png_destroy_info_struct (pngenc->png_struct_ptr, &pngenc->png_info_ptr);
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png_destroy_write_struct (&pngenc->png_struct_ptr, (png_infopp) NULL);
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/* Set final size and store */
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gst_memory_unmap (pngenc->output_mem, &pngenc->output_map);
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/* Trim the buffer size */
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memory_size = pngenc->output_mem_pos;
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gst_memory_resize (pngenc->output_mem, 0, memory_size);
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pngenc->output_mem_pos = 0;
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outbuf = gst_buffer_new ();
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gst_buffer_append_memory (outbuf, pngenc->output_mem);
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pngenc->output_mem = NULL;
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frame->output_buffer = outbuf;
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GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT (frame);
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if ((ret = gst_video_encoder_finish_frame (encoder, frame)) != GST_FLOW_OK)
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goto done;
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++pngenc->frame_count;
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if (pngenc->snapshot)
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ret = GST_FLOW_EOS;
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done:
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GST_DEBUG_OBJECT (pngenc, "END, ret:%d", ret);
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return ret;
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/* ERRORS */
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struct_init_fail:
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{
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GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
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("Failed to initialize png structure"));
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return GST_FLOW_ERROR;
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}
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png_info_fail:
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{
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png_destroy_write_struct (&(pngenc->png_struct_ptr), (png_infopp) NULL);
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GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
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("Failed to initialize the png info structure"));
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return GST_FLOW_ERROR;
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}
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longjmp_fail:
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{
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png_destroy_write_struct (&pngenc->png_struct_ptr, &pngenc->png_info_ptr);
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GST_ELEMENT_ERROR (pngenc, LIBRARY, FAILED, (NULL),
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("returning from longjmp"));
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return GST_FLOW_ERROR;
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}
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}
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static gboolean
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gst_pngenc_propose_allocation (GstVideoEncoder * encoder, GstQuery * query)
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{
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gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL);
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return GST_VIDEO_ENCODER_CLASS (parent_class)->propose_allocation (encoder,
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query);
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}
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static void
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gst_pngenc_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec)
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{
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GstPngEnc *pngenc;
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pngenc = GST_PNGENC (object);
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|
|
|
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;
|
|
}
|
|
}
|