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ext/libpng/: Ported pngdec to 0.9

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Original commit message from CVS:
2005-10-15  Julien MOUTTE  <julien@moutte.net>

* ext/libpng/Makefile.am:
* ext/libpng/gstpng.c: (plugin_init):
* ext/libpng/gstpngdec.c: (gst_pngdec_class_init),
(gst_pngdec_init), (user_read_data), (gst_pngdec_chain):
* ext/libpng/gstpngdec.h: Ported pngdec to 0.9
This commit is contained in:
Julien Moutte 2005-10-15 16:48:55 +00:00
parent 22b9a5cd43
commit 2ae32d6f92
6 changed files with 84 additions and 75 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2005-10-15 Julien MOUTTE <julien@moutte.net>
* ext/libpng/Makefile.am:
* ext/libpng/gstpng.c: (plugin_init):
* ext/libpng/gstpngdec.c: (gst_pngdec_class_init),
(gst_pngdec_init), (user_read_data), (gst_pngdec_chain):
* ext/libpng/gstpngdec.h: Ported pngdec to 0.9
2005-10-14 Michal Benes <michal dot benes at xeris dot cz>
Reviewed by: Tim-Philipp Müller <tim at centricular dot net>

2
common

@ -1 +1 @@
Subproject commit 2485a65b662de25fb7b71857e34411426c6f530c
Subproject commit 507a4dc1d4fd6957ee8d62ca612a9a9054c271fc

2
ext/libpng/Makefile.am
View file

@ -1,6 +1,6 @@
plugin_LTLIBRARIES = libgstpng.la
libgstpng_la_SOURCES = gstpng.c gstpngenc.c # gstpngdec.c
libgstpng_la_SOURCES = gstpng.c gstpngenc.c gstpngdec.c
libgstpng_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS)
libgstpng_la_LIBADD = $(GST_LIBS) $(LIBPNG_LIBS)
libgstpng_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)

6
ext/libpng/gstpng.c
View file

@ -29,9 +29,9 @@
static gboolean
plugin_init (GstPlugin * plugin)
{
/* if (!gst_element_register (plugin, "pngdec", GST_RANK_PRIMARY, */
/* GST_TYPE_PNGDEC)) */
/* return FALSE; */
if (!gst_element_register (plugin, "pngdec", GST_RANK_PRIMARY,
GST_TYPE_PNGDEC))
return FALSE;
if (!gst_element_register (plugin, "pngenc", GST_RANK_NONE, GST_TYPE_PNGENC))
return FALSE;

122
ext/libpng/gstpngdec.c
View file

@ -16,9 +16,10 @@
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include "gstpngdec.h"
#include <string.h>
#include <gst/video/video.h>
static GstElementDetails gst_pngdec_details = {
@ -28,28 +29,17 @@ static GstElementDetails gst_pngdec_details = {
"Wim Taymans <wim@fluendo.com>",
};
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
};
GST_DEBUG_CATEGORY (pngdec_debug);
#define GST_CAT_DEFAULT pngdec_debug
static void gst_pngdec_base_init (gpointer g_class);
static void gst_pngdec_class_init (GstPngDecClass * klass);
static void gst_pngdec_init (GstPngDec * pngdec);
static void gst_pngdec_chain (GstPad * pad, GstData * _data);
static GstFlowReturn gst_pngdec_chain (GstPad * pad, GstBuffer * buf);
static GstElementClass *parent_class = NULL;
static void
user_error_fn (png_structp png_ptr, png_const_charp error_msg)
{
@ -62,7 +52,6 @@ user_warning_fn (png_structp png_ptr, png_const_charp warning_msg)
g_warning ("%s", warning_msg);
}
GType
gst_pngdec_get_type (void)
{
@ -91,7 +80,7 @@ static GstStaticPadTemplate gst_pngdec_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_BGRA ";" GST_VIDEO_CAPS_BGR)
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_RGB)
);
static GstStaticPadTemplate gst_pngdec_sink_pad_template =
@ -125,21 +114,10 @@ gst_pngdec_class_init (GstPngDecClass * klass)
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
GST_DEBUG_CATEGORY_INIT (pngdec_debug, "pngdec", 0, "PNG image decoder");
}
static GstPadLinkReturn
gst_pngdec_sinklink (GstPad * pad, const GstCaps * caps)
{
GstPngDec *pngdec;
GstStructure *structure;
pngdec = GST_PNGDEC (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_double (structure, "framerate", &pngdec->fps);
return TRUE;
}
static void
gst_pngdec_init (GstPngDec * pngdec)
@ -153,9 +131,6 @@ gst_pngdec_init (GstPngDec * pngdec)
gst_element_add_pad (GST_ELEMENT (pngdec), pngdec->srcpad);
gst_pad_set_chain_function (pngdec->sinkpad, gst_pngdec_chain);
gst_pad_set_link_function (pngdec->sinkpad, gst_pngdec_sinklink);
gst_pad_use_explicit_caps (pngdec->srcpad);
pngdec->png = NULL;
pngdec->info = NULL;
@ -163,7 +138,7 @@ gst_pngdec_init (GstPngDec * pngdec)
pngdec->color_type = -1;
pngdec->width = -1;
pngdec->height = -1;
pngdec->fps = -1;
pngdec->fps = 0.0;
}
static void
@ -173,6 +148,8 @@ user_read_data (png_structp png_ptr, png_bytep data, png_size_t length)
dec = GST_PNGDEC (png_ptr->io_ptr);
GST_LOG ("reading %d bytes of data at offset %d", length, dec->offset);
if (GST_BUFFER_SIZE (dec->buffer_in) < dec->offset + length) {
g_warning ("reading past end of buffer");
}
@ -182,10 +159,12 @@ user_read_data (png_structp png_ptr, png_bytep data, png_size_t length)
dec->offset += length;
}
static void
gst_pngdec_chain (GstPad * pad, GstData * _data)
#define ROUND_UP_4(x) (((x) + 3) & ~3)
static GstFlowReturn
gst_pngdec_chain (GstPad * pad, GstBuffer * buf)
{
GstBuffer *buf = GST_BUFFER (_data);
GstFlowReturn ret = GST_FLOW_OK;
GstPngDec *pngdec;
png_uint_32 width, height;
gint depth, color;
@ -193,11 +172,14 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
GstBuffer *out;
gint i;
GST_LOG ("chain");
pngdec = GST_PNGDEC (gst_pad_get_parent (pad));
if (!GST_PAD_IS_USABLE (pngdec->srcpad)) {
gst_buffer_unref (buf);
return;
ret = GST_FLOW_UNEXPECTED;
goto beach;
}
pngdec->buffer_in = buf;
@ -211,7 +193,8 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
gst_buffer_unref (buf);
GST_ELEMENT_ERROR (pngdec, LIBRARY, INIT, (NULL),
("Failed to initialize png structure"));
return;
ret = GST_FLOW_UNEXPECTED;
goto beach;
}
pngdec->info = png_create_info_struct (pngdec->png);
@ -221,7 +204,8 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
(png_infopp) NULL);
GST_ELEMENT_ERROR (pngdec, LIBRARY, INIT, (NULL),
("Failed to initialize info structure"));
return;
ret = GST_FLOW_UNEXPECTED;
goto beach;
}
pngdec->endinfo = png_create_info_struct (pngdec->png);
@ -230,7 +214,8 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
png_destroy_read_struct (&pngdec->png, &pngdec->info, (png_infopp) NULL);
GST_ELEMENT_ERROR (pngdec, LIBRARY, INIT, (NULL),
("Failed to initialize endinfo structure"));
return;
ret = GST_FLOW_UNEXPECTED;
goto beach;
}
/* non-0 return is from a longjmp inside of libpng */
@ -239,7 +224,8 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
png_destroy_read_struct (&pngdec->png, &pngdec->info, &pngdec->endinfo);
GST_ELEMENT_ERROR (pngdec, LIBRARY, FAILED, (NULL),
("returning from longjmp"));
return;
ret = GST_FLOW_UNEXPECTED;
goto beach;
}
png_set_read_fn (pngdec->png, pngdec, user_read_data);
@ -253,7 +239,8 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
png_destroy_read_struct (&pngdec->png, &pngdec->info, &pngdec->endinfo);
GST_ELEMENT_ERROR (pngdec, STREAM, NOT_IMPLEMENTED, (NULL),
("pngdec only supports 8 bit images for now"));
return;
ret = GST_FLOW_UNEXPECTED;
goto beach;
}
if (pngdec->width != width ||
@ -263,24 +250,25 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
gboolean ret;
gint bpp;
GST_LOG ("this is a %dx%d PNG image", width, height);
pngdec->width = width;
pngdec->height = height;
pngdec->color_type = pngdec->info->color_type;
templ = gst_caps_copy (gst_pad_template_get_caps
(gst_static_pad_template_get (&gst_pngdec_src_pad_template)));
switch (pngdec->color_type) {
case PNG_COLOR_TYPE_RGB:
GST_LOG ("we have no alpha channel, depth is 24 bits");
bpp = 24;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
GST_LOG ("we have an alpha channel, depth is 32 bits");
bpp = 32;
break;
default:
GST_ELEMENT_ERROR (pngdec, STREAM, NOT_IMPLEMENTED, (NULL),
("pngdec does not support grayscale or paletted data yet"));
return;
ret = GST_FLOW_UNEXPECTED;
goto beach;
}
caps = gst_caps_new_simple ("video/x-raw-rgb",
@ -288,29 +276,44 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
"height", G_TYPE_INT, height,
"bpp", G_TYPE_INT, bpp, "framerate", G_TYPE_DOUBLE, pngdec->fps, NULL);
templ = gst_caps_copy (gst_pad_template_get_caps
(gst_static_pad_template_get (&gst_pngdec_src_pad_template)));
res = gst_caps_intersect (templ, caps);
gst_caps_free (caps);
gst_caps_free (templ);
ret = gst_pad_set_explicit_caps (pngdec->srcpad, res);
gst_caps_free (res);
gst_caps_unref (caps);
gst_caps_unref (templ);
{
gchar *caps_str = gst_caps_to_string (res);
GST_LOG ("intersecting caps with template gave %s", caps_str);
g_free (caps_str);
}
ret = gst_pad_set_caps (pngdec->srcpad, res);
gst_caps_unref (res);
if (!ret) {
gst_buffer_unref (buf);
png_destroy_read_struct (&pngdec->png, &pngdec->info, &pngdec->endinfo);
GST_ELEMENT_ERROR (pngdec, CORE, NEGOTIATION, (NULL), (NULL));
return;
ret = GST_FLOW_UNEXPECTED;
goto beach;
}
}
rows = (png_bytep *) g_malloc (sizeof (png_bytep) * height);
out = gst_pad_alloc_buffer (pngdec->srcpad, GST_BUFFER_OFFSET_NONE,
height * pngdec->info->rowbytes);
ret = gst_pad_alloc_buffer (pngdec->srcpad, GST_BUFFER_OFFSET_NONE,
height * ROUND_UP_4 (pngdec->info->rowbytes),
GST_PAD_CAPS (pngdec->srcpad), &out);
if (ret != GST_FLOW_OK) {
goto beach;
}
inp = GST_BUFFER_DATA (out);
for (i = 0; i < height; i++) {
rows[i] = inp;
inp += pngdec->info->rowbytes;
inp += ROUND_UP_4 (pngdec->info->rowbytes);
}
png_read_image (pngdec->png, rows);
@ -322,5 +325,10 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
pngdec->buffer_in = NULL;
gst_buffer_unref (buf);
gst_pad_push (pngdec->srcpad, GST_DATA (out));
/* Pushing */
GST_LOG ("pushing our raw RGB frame");
ret = gst_pad_push (pngdec->srcpad, out);
beach:
return ret;
}

19
ext/libpng/gstpngdec.h
View file

@ -24,16 +24,13 @@
#include <gst/gst.h>
#include <png.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
G_BEGIN_DECLS
#define GST_TYPE_PNGDEC (gst_pngdec_get_type())
#define GST_PNGDEC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PNGDEC,GstPngDec))
#define GST_TYPE_PNGDEC (gst_pngdec_get_type())
#define GST_PNGDEC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PNGDEC,GstPngDec))
#define GST_PNGDEC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PNGDEC,GstPngDec))
#define GST_IS_PNGDEC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PNGDEC))
#define GST_IS_PNGDEC_CLASS(obj)(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PNGDEC))
#define GST_IS_PNGDEC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PNGDEC))
#define GST_IS_PNGDEC_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PNGDEC))
typedef struct _GstPngDec GstPngDec;
typedef struct _GstPngDecClass GstPngDecClass;
@ -65,10 +62,6 @@ struct _GstPngDecClass
GType gst_pngdec_get_type(void);
#ifdef __cplusplus
}
#endif /* __cplusplus */
G_END_DECLS
#endif /* __GST_PNGDEC_H__ */