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cairorender: Remove pull mode, it only adds complexity but not advantages

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This commit is contained in:
Sebastian Dröge 2009-07-17 13:24:28 +02:00
parent 5d0787aa20
commit 644e113064
1 changed files with 5 additions and 77 deletions
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82
ext/cairo/gstcairorender.c
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@ -72,20 +72,6 @@ write_func (void *closure, const unsigned char *data, unsigned int length)
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
read_func (void *closure, unsigned char *data, unsigned int length)
{
GstCairoRender *c = GST_CAIRO_RENDER (closure);
GstBuffer *buf;
if (gst_pad_pull_range (c->snk, c->offset, length, &buf) != GST_FLOW_OK)
return CAIRO_STATUS_READ_ERROR;
c->offset += GST_BUFFER_SIZE (buf);
memcpy (data, GST_BUFFER_DATA (buf), length);
gst_buffer_unref (buf);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
read_buffer (void *closure, unsigned char *data, unsigned int length)
{
@ -142,28 +128,6 @@ gst_cairo_render_chain (GstPad * pad, GstBuffer * buf)
return success ? GST_FLOW_OK : GST_FLOW_ERROR;
}
static gboolean
gst_cairo_render_activate_sink (GstPad * pad)
{
GstCairoRender *c = GST_CAIRO_RENDER (GST_PAD_PARENT (pad));
GstFormat format = GST_FORMAT_BYTES;
if (c->png) {
if (!gst_pad_check_pull_range (pad)) {
GST_DEBUG_OBJECT (c, "We do not have random access. "
"Let's hope each buffer we receive contains a whole png image.");
return gst_pad_activate_push (pad, TRUE);
}
if (!gst_pad_query_peer_duration (c->snk, &format, &c->duration)) {
GST_DEBUG_OBJECT (c, "Could not query duration. "
"Let's hope each buffer we receive contains a whole png image.");
return gst_pad_activate_push (pad, TRUE);
}
return gst_pad_activate_pull (pad, TRUE);
}
return gst_pad_activate_push (pad, TRUE);
}
static gboolean
gst_cairo_render_setcaps_sink (GstPad * pad, GstCaps * caps)
{
@ -231,6 +195,7 @@ gst_cairo_render_setcaps_sink (GstPad * pad, GstCaps * caps)
} else
#endif
#if CAIRO_HAS_SVG_SURFACE
//TODO: SVG mimetype + typefinder !!
if (!strcmp (mime, "image/svg")) {
c->surface = cairo_svg_surface_create_for_stream (write_func, c, w, h);
} else
@ -245,42 +210,6 @@ gst_cairo_render_setcaps_sink (GstPad * pad, GstCaps * caps)
return TRUE;
}
static void
gst_cairo_render_loop (gpointer data)
{
GstCairoRender *c = GST_CAIRO_RENDER (data);
if (c->offset >= c->duration) {
gst_pad_pause_task (c->snk);
gst_pad_send_event (c->snk, gst_event_new_eos ());
return;
}
if (!gst_cairo_render_push_surface (c,
cairo_image_surface_create_from_png_stream (read_func, c))) {
GST_DEBUG_OBJECT (c, "Could not push image.");
gst_pad_pause_task (c->snk);
gst_pad_send_event (c->snk, gst_event_new_eos ());
}
}
static gboolean
gst_cairo_render_activatepull_sink (GstPad * pad, gboolean active)
{
GstCairoRender *c = GST_CAIRO_RENDER (GST_PAD_PARENT (pad));
if (active) {
c->offset = 0;
return gst_pad_start_task (pad, gst_cairo_render_loop, c);
} else
return gst_pad_stop_task (pad);
}
static GstElementDetails cairo_render_details =
GST_ELEMENT_DETAILS ("CAIRO encoder",
"Codec/Encoder", "Encodes streams using CAIRO",
"Lutz Mueller <lutz@topfrose.de>");
static GstStaticPadTemplate t_src = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (
#if CAIRO_HAS_PDF_SURFACE
@ -326,9 +255,6 @@ gst_cairo_render_init (GstCairoRender * c, GstCairoRenderClass * klass)
gst_pad_new_from_template (gst_static_pad_template_get (&t_snk), "sink");
gst_pad_set_event_function (c->snk, gst_cairo_render_event);
gst_pad_set_chain_function (c->snk, gst_cairo_render_chain);
gst_pad_set_activate_function (c->snk, gst_cairo_render_activate_sink);
gst_pad_set_activatepull_function (c->snk,
gst_cairo_render_activatepull_sink);
gst_pad_set_setcaps_function (c->snk, gst_cairo_render_setcaps_sink);
gst_pad_use_fixed_caps (c->snk);
gst_element_add_pad (GST_ELEMENT (c), c->snk);
@ -348,7 +274,9 @@ gst_cairo_render_base_init (gpointer g_class)
{
GstElementClass *ec = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (ec, &cairo_render_details);
gst_element_class_set_details_simple (ec, "Cairo encoder",
"Codec/Encoder", "Encodes streams using Cairo",
"Lutz Mueller <lutz@topfrose.de>");
gst_element_class_add_pad_template (ec, gst_static_pad_template_get (&t_snk));
gst_element_class_add_pad_template (ec, gst_static_pad_template_get (&t_src));
}
@ -374,5 +302,5 @@ gst_cairo_render_class_init (GstCairoRenderClass * klass)
gobject_class->finalize = gst_cairo_render_finalize;
GST_DEBUG_CATEGORY_INIT (cairo_render_debug, "cairo_render", 0,
"CAIRO encoder");
"Cairo encoder");
}