gstreamer/ext/gdk_pixbuf/gstgdkpixbufdec.c
2021-03-29 12:45:21 +02:00

579 lines
16 KiB
C

/* GStreamer GdkPixbuf-based image decoder
* Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2003 David A. Schleef <ds@schleef.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <string.h>
#include "gstgdkpixbufelements.h"
#include "gstgdkpixbufdec.h"
GST_DEBUG_CATEGORY_STATIC (gdkpixbufdec_debug);
#define GST_CAT_DEFAULT gdkpixbufdec_debug
static GstStaticPadTemplate gst_gdk_pixbuf_dec_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/png; "
/* "image/jpeg; " disabled because we can't handle MJPEG */
/*"image/gif; " disabled because we can't handle animated gifs */
"image/x-icon; "
"application/x-navi-animation; "
"image/x-cmu-raster; "
"image/x-sun-raster; "
"image/x-pixmap; "
"image/tiff; "
"image/x-portable-anymap; "
"image/x-portable-bitmap; "
"image/x-portable-graymap; "
"image/x-portable-pixmap; "
"image/bmp; "
"image/x-bmp; "
"image/x-MS-bmp; "
"image/vnd.wap.wbmp; " "image/x-bitmap; " "image/x-tga; "
"image/x-pcx; image/svg; image/svg+xml")
);
static GstStaticPadTemplate gst_gdk_pixbuf_dec_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("RGB") "; "
GST_VIDEO_CAPS_MAKE ("RGBA"))
);
static GstStateChangeReturn
gst_gdk_pixbuf_dec_change_state (GstElement * element,
GstStateChange transition);
static GstFlowReturn gst_gdk_pixbuf_dec_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static gboolean gst_gdk_pixbuf_dec_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
#define gst_gdk_pixbuf_dec_parent_class parent_class
G_DEFINE_TYPE (GstGdkPixbufDec, gst_gdk_pixbuf_dec, GST_TYPE_ELEMENT);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (gdkpixbufdec, "gdkpixbufdec",
GST_RANK_SECONDARY, GST_TYPE_GDK_PIXBUF_DEC,
gdk_pixbuf_element_init (plugin));
static gboolean
gst_gdk_pixbuf_dec_sink_setcaps (GstGdkPixbufDec * filter, GstCaps * caps)
{
const GValue *framerate;
GstStructure *s;
s = gst_caps_get_structure (caps, 0);
if ((framerate = gst_structure_get_value (s, "framerate")) != NULL) {
filter->in_fps_n = gst_value_get_fraction_numerator (framerate);
filter->in_fps_d = gst_value_get_fraction_denominator (framerate);
GST_DEBUG_OBJECT (filter, "got framerate of %d/%d fps => packetized mode",
filter->in_fps_n, filter->in_fps_d);
} else {
filter->in_fps_n = 0;
filter->in_fps_d = 1;
GST_DEBUG_OBJECT (filter, "no framerate, assuming single image");
}
return TRUE;
}
static GstCaps *
gst_gdk_pixbuf_dec_get_capslist (GstCaps * filter)
{
GSList *slist;
GSList *slist0;
GstCaps *capslist = NULL;
GstCaps *return_caps = NULL;
GstCaps *tmpl_caps;
capslist = gst_caps_new_empty ();
slist0 = gdk_pixbuf_get_formats ();
for (slist = slist0; slist; slist = g_slist_next (slist)) {
GdkPixbufFormat *pixbuf_format;
char **mimetypes;
char **mimetype;
pixbuf_format = slist->data;
mimetypes = gdk_pixbuf_format_get_mime_types (pixbuf_format);
for (mimetype = mimetypes; *mimetype; mimetype++) {
gst_caps_append_structure (capslist, gst_structure_new_empty (*mimetype));
}
g_strfreev (mimetypes);
}
g_slist_free (slist0);
tmpl_caps =
gst_static_caps_get (&gst_gdk_pixbuf_dec_sink_template.static_caps);
return_caps = gst_caps_intersect (capslist, tmpl_caps);
gst_caps_unref (tmpl_caps);
gst_caps_unref (capslist);
if (filter && return_caps) {
GstCaps *temp;
temp = gst_caps_intersect (return_caps, filter);
gst_caps_unref (return_caps);
return_caps = temp;
}
return return_caps;
}
static gboolean
gst_gdk_pixbuf_dec_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
gboolean res;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_gdk_pixbuf_dec_get_capslist (filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
/* initialize the plugin's class */
static void
gst_gdk_pixbuf_dec_class_init (GstGdkPixbufDecClass * klass)
{
GstElementClass *gstelement_class;
gstelement_class = (GstElementClass *) klass;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_dec_change_state);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_gdk_pixbuf_dec_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_gdk_pixbuf_dec_sink_template);
gst_element_class_set_static_metadata (gstelement_class,
"GdkPixbuf image decoder", "Codec/Decoder/Image",
"Decodes images in a video stream using GdkPixbuf",
"David A. Schleef <ds@schleef.org>, Renato Filho <renato.filho@indt.org.br>");
GST_DEBUG_CATEGORY_INIT (gdkpixbufdec_debug, "gdkpixbuf", 0,
"GdkPixbuf image decoder");
}
static void
gst_gdk_pixbuf_dec_init (GstGdkPixbufDec * filter)
{
filter->sinkpad =
gst_pad_new_from_static_template (&gst_gdk_pixbuf_dec_sink_template,
"sink");
gst_pad_set_query_function (filter->sinkpad,
GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_dec_sink_query));
gst_pad_set_chain_function (filter->sinkpad,
GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_dec_chain));
gst_pad_set_event_function (filter->sinkpad,
GST_DEBUG_FUNCPTR (gst_gdk_pixbuf_dec_sink_event));
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
filter->srcpad =
gst_pad_new_from_static_template (&gst_gdk_pixbuf_dec_src_template,
"src");
gst_pad_use_fixed_caps (filter->srcpad);
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
filter->last_timestamp = GST_CLOCK_TIME_NONE;
filter->pixbuf_loader = NULL;
filter->packetized = FALSE;
}
static gboolean
gst_gdk_pixbuf_dec_setup_pool (GstGdkPixbufDec * filter, GstVideoInfo * info)
{
GstCaps *target;
GstQuery *query;
GstBufferPool *pool;
GstStructure *config;
guint size, min, max;
target = gst_pad_get_current_caps (filter->srcpad);
if (!target)
return FALSE;
/* try to get a bufferpool now */
/* find a pool for the negotiated caps now */
query = gst_query_new_allocation (target, TRUE);
if (!gst_pad_peer_query (filter->srcpad, query)) {
/* not a problem, we use the query defaults */
GST_DEBUG_OBJECT (filter, "ALLOCATION query failed");
}
if (gst_query_get_n_allocation_pools (query) > 0) {
/* we got configuration from our peer, parse them */
gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
} else {
pool = NULL;
size = info->size;
min = max = 0;
}
gst_query_unref (query);
if (pool == NULL) {
/* we did not get a pool, make one ourselves then */
pool = gst_buffer_pool_new ();
}
/* and configure */
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (config, target, size, min, max);
gst_buffer_pool_set_config (pool, config);
if (filter->pool) {
gst_buffer_pool_set_active (filter->pool, FALSE);
gst_object_unref (filter->pool);
}
filter->pool = pool;
/* and activate */
gst_buffer_pool_set_active (filter->pool, TRUE);
gst_caps_unref (target);
return TRUE;
}
static GstFlowReturn
gst_gdk_pixbuf_dec_flush (GstGdkPixbufDec * filter)
{
GstBuffer *outbuf;
GdkPixbuf *pixbuf;
int y;
guint8 *out_pix;
guint8 *in_pix;
int in_rowstride, out_rowstride;
GstFlowReturn ret;
GstCaps *caps = NULL;
gint width, height;
gint n_channels;
GstVideoFrame frame;
pixbuf = gdk_pixbuf_loader_get_pixbuf (filter->pixbuf_loader);
if (pixbuf == NULL)
goto no_pixbuf;
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
if (GST_VIDEO_INFO_FORMAT (&filter->info) == GST_VIDEO_FORMAT_UNKNOWN) {
GstVideoInfo info;
GstVideoFormat fmt;
GList *l;
GST_DEBUG ("Set size to %dx%d", width, height);
n_channels = gdk_pixbuf_get_n_channels (pixbuf);
switch (n_channels) {
case 3:
fmt = GST_VIDEO_FORMAT_RGB;
break;
case 4:
fmt = GST_VIDEO_FORMAT_RGBA;
break;
default:
goto channels_not_supported;
}
gst_video_info_init (&info);
gst_video_info_set_format (&info, fmt, width, height);
info.fps_n = filter->in_fps_n;
info.fps_d = filter->in_fps_d;
caps = gst_video_info_to_caps (&info);
filter->info = info;
gst_pad_set_caps (filter->srcpad, caps);
gst_caps_unref (caps);
gst_gdk_pixbuf_dec_setup_pool (filter, &info);
for (l = filter->pending_events; l; l = l->next)
gst_pad_push_event (filter->srcpad, l->data);
g_list_free (filter->pending_events);
filter->pending_events = NULL;
}
ret = gst_buffer_pool_acquire_buffer (filter->pool, &outbuf, NULL);
if (ret != GST_FLOW_OK)
goto no_buffer;
GST_BUFFER_TIMESTAMP (outbuf) = filter->last_timestamp;
GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
in_pix = gdk_pixbuf_get_pixels (pixbuf);
in_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
gst_video_frame_map (&frame, &filter->info, outbuf, GST_MAP_WRITE);
out_pix = GST_VIDEO_FRAME_PLANE_DATA (&frame, 0);
out_rowstride = GST_VIDEO_FRAME_PLANE_STRIDE (&frame, 0);
for (y = 0; y < height; y++) {
memcpy (out_pix, in_pix, width * GST_VIDEO_FRAME_COMP_PSTRIDE (&frame, 0));
in_pix += in_rowstride;
out_pix += out_rowstride;
}
gst_video_frame_unmap (&frame);
GST_DEBUG ("pushing... %" G_GSIZE_FORMAT " bytes",
gst_buffer_get_size (outbuf));
ret = gst_pad_push (filter->srcpad, outbuf);
if (ret != GST_FLOW_OK)
GST_DEBUG_OBJECT (filter, "flow: %s", gst_flow_get_name (ret));
return ret;
/* ERRORS */
no_pixbuf:
{
GST_ELEMENT_ERROR (filter, STREAM, DECODE, (NULL),
("error getting pixbuf"));
return GST_FLOW_ERROR;
}
channels_not_supported:
{
GST_ELEMENT_ERROR (filter, STREAM, DECODE, (NULL),
("%d channels not supported", n_channels));
return GST_FLOW_ERROR;
}
no_buffer:
{
GST_DEBUG ("Failed to create outbuffer - %s", gst_flow_get_name (ret));
return ret;
}
}
static gboolean
gst_gdk_pixbuf_dec_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstFlowReturn res = GST_FLOW_OK;
gboolean ret = TRUE, forward = TRUE;
GstGdkPixbufDec *pixbuf;
pixbuf = GST_GDK_PIXBUF_DEC (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_gdk_pixbuf_dec_sink_setcaps (pixbuf, caps);
forward = FALSE;
break;
}
case GST_EVENT_EOS:
if (pixbuf->pixbuf_loader != NULL) {
gdk_pixbuf_loader_close (pixbuf->pixbuf_loader, NULL);
res = gst_gdk_pixbuf_dec_flush (pixbuf);
g_object_unref (G_OBJECT (pixbuf->pixbuf_loader));
pixbuf->pixbuf_loader = NULL;
/* as long as we don't have flow returns for event functions we need
* to post an error here, or the application might never know that
* things failed */
if (res != GST_FLOW_OK && res != GST_FLOW_FLUSHING
&& res != GST_FLOW_EOS && res != GST_FLOW_NOT_LINKED) {
GST_ELEMENT_FLOW_ERROR (pixbuf, res);
forward = FALSE;
ret = FALSE;
}
}
break;
case GST_EVENT_FLUSH_STOP:
g_list_free_full (pixbuf->pending_events,
(GDestroyNotify) gst_event_unref);
pixbuf->pending_events = NULL;
/* Fall through */
case GST_EVENT_SEGMENT:
{
const GstSegment *segment;
GstSegment output_segment;
guint32 seqnum;
gst_event_parse_segment (event, &segment);
if (segment->format == GST_FORMAT_BYTES)
pixbuf->packetized = FALSE;
else
pixbuf->packetized = TRUE;
if (segment->format != GST_FORMAT_TIME) {
seqnum = gst_event_get_seqnum (event);
gst_event_unref (event);
gst_segment_init (&output_segment, GST_FORMAT_TIME);
event = gst_event_new_segment (&output_segment);
gst_event_set_seqnum (event, seqnum);
}
if (pixbuf->pixbuf_loader != NULL) {
gdk_pixbuf_loader_close (pixbuf->pixbuf_loader, NULL);
g_object_unref (G_OBJECT (pixbuf->pixbuf_loader));
pixbuf->pixbuf_loader = NULL;
}
break;
}
default:
break;
}
if (forward) {
if (!gst_pad_has_current_caps (pixbuf->srcpad) &&
GST_EVENT_IS_SERIALIZED (event)
&& GST_EVENT_TYPE (event) > GST_EVENT_CAPS
&& GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP
&& GST_EVENT_TYPE (event) != GST_EVENT_EOS) {
ret = TRUE;
pixbuf->pending_events = g_list_prepend (pixbuf->pending_events, event);
} else {
ret = gst_pad_event_default (pad, parent, event);
}
} else {
gst_event_unref (event);
}
return ret;
}
static GstFlowReturn
gst_gdk_pixbuf_dec_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstGdkPixbufDec *filter;
GstFlowReturn ret = GST_FLOW_OK;
GError *error = NULL;
GstClockTime timestamp;
GstMapInfo map;
filter = GST_GDK_PIXBUF_DEC (parent);
timestamp = GST_BUFFER_TIMESTAMP (buf);
if (GST_CLOCK_TIME_IS_VALID (timestamp))
filter->last_timestamp = timestamp;
GST_LOG_OBJECT (filter, "buffer with ts: %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
if (filter->pixbuf_loader == NULL)
filter->pixbuf_loader = gdk_pixbuf_loader_new ();
gst_buffer_map (buf, &map, GST_MAP_READ);
GST_LOG_OBJECT (filter, "Writing buffer size %d", (gint) map.size);
if (!gdk_pixbuf_loader_write (filter->pixbuf_loader, map.data, map.size,
&error))
goto error;
if (filter->packetized == TRUE) {
gdk_pixbuf_loader_close (filter->pixbuf_loader, NULL);
ret = gst_gdk_pixbuf_dec_flush (filter);
g_object_unref (filter->pixbuf_loader);
filter->pixbuf_loader = NULL;
}
gst_buffer_unmap (buf, &map);
gst_buffer_unref (buf);
return ret;
/* ERRORS */
error:
{
GST_ELEMENT_ERROR (filter, STREAM, DECODE, (NULL),
("gdk_pixbuf_loader_write error: %s", error->message));
g_error_free (error);
gst_buffer_unmap (buf, &map);
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}
static GstStateChangeReturn
gst_gdk_pixbuf_dec_change_state (GstElement * element,
GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstGdkPixbufDec *dec = GST_GDK_PIXBUF_DEC (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* default to single image mode, setcaps function might not be called */
dec->in_fps_n = 0;
dec->in_fps_d = 1;
gst_video_info_init (&dec->info);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
dec->in_fps_n = 0;
dec->in_fps_d = 0;
if (dec->pool) {
gst_buffer_pool_set_active (dec->pool, FALSE);
gst_object_replace ((GstObject **) & dec->pool, NULL);
}
g_list_free_full (dec->pending_events, (GDestroyNotify) gst_event_unref);
dec->pending_events = NULL;
if (dec->pixbuf_loader != NULL) {
gdk_pixbuf_loader_close (dec->pixbuf_loader, NULL);
g_object_unref (G_OBJECT (dec->pixbuf_loader));
dec->pixbuf_loader = NULL;
}
break;
default:
break;
}
return ret;
}