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ext/libpng/gstpngdec.c: Handle only 8-bppc (bits-per-pixel-component) images, better error handling and correct strid...

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Original commit message from CVS:
Reviewed by:  Ronald S. Bultje  <rbultje@ronald.bitfreak.net>
* ext/libpng/gstpngdec.c: (gst_pngdec_src_getcaps),
(gst_pngdec_chain):
Handle only 8-bppc (bits-per-pixel-component) images, better
error handling and correct strides. Fixes #163177.
* ext/libpng/gstpngenc.c: (gst_pngenc_sinklink),
(gst_pngenc_chain):
Better error handling. Fixes #163348.
This commit is contained in:
Ronald S. Bultje 2005-01-09 01:40:14 +00:00
parent ab79962fe5
commit 25dcc61a62
3 changed files with 57 additions and 20 deletions
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12
ChangeLog
View file

@ -1,3 +1,15 @@
2005-01-09 Gergely Nagy <algernon@bonehunter.rulez.org>
Reviewed by: Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* ext/libpng/gstpngdec.c: (gst_pngdec_src_getcaps),
(gst_pngdec_chain):
Handle only 8-bppc (bits-per-pixel-component) images, better
error handling and correct strides. Fixes #163177.
* ext/libpng/gstpngenc.c: (gst_pngenc_sinklink),
(gst_pngenc_chain):
Better error handling. Fixes #163348.
2005-01-09 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* ext/dvdnav/dvdnavsrc.c: (dvdnavsrc_get_type),

35
ext/libpng/gstpngdec.c
View file

@ -185,6 +185,12 @@ gst_pngdec_src_getcaps (GstPad * pad)
if (pngdec->color_type != -1) {
GstCaps *to_inter = NULL;
if (pngdec->info && pngdec->info->bit_depth != 8) {
GST_ELEMENT_ERROR (pngdec, STREAM, NOT_IMPLEMENTED, (NULL),
("pngdec only supports 8 bit images for now"));
return NULL;
}
switch (pngdec->color_type) {
case PNG_COLOR_TYPE_RGB:
to_inter = gst_caps_new_simple ("video/x-raw-rgb",
@ -269,30 +275,38 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
pngdec->png = png_create_read_struct (PNG_LIBPNG_VER_STRING,
(png_voidp) NULL, user_error_fn, user_warning_fn);
/* FIXME: better error handling */
if (pngdec->png == NULL) {
g_warning ("Failed to initialize png structure");
gst_buffer_unref (buf);
GST_ELEMENT_ERROR (pngdec, LIBRARY, INIT, (NULL),
("Failed to initialize png structure"));
return;
}
pngdec->info = png_create_info_struct (pngdec->png);
if (pngdec->info == NULL) {
g_warning ("Failed to initialize info structure");
gst_buffer_unref (buf);
png_destroy_read_struct (&(pngdec->png), (png_infopp) NULL,
(png_infopp) NULL);
GST_ELEMENT_ERROR (pngdec, LIBRARY, INIT, (NULL),
("Failed to initialize info structure"));
return;
}
pngdec->endinfo = png_create_info_struct (pngdec->png);
if (pngdec->endinfo == NULL) {
g_warning ("Failed to initialize endinfo structure");
gst_buffer_unref (buf);
png_destroy_read_struct (&pngdec->png, &pngdec->info, (png_infopp) NULL);
GST_ELEMENT_ERROR (pngdec, LIBRARY, INIT, (NULL),
("Failed to initialize endinfo structure"));
return;
}
/* non-0 return is from a longjmp inside of libpng */
if (setjmp (pngdec->png->jmpbuf) != 0) {
GST_DEBUG ("returning from longjmp");
gst_buffer_unref (buf);
png_destroy_read_struct (&pngdec->png, &pngdec->info, &pngdec->endinfo);
GST_ELEMENT_ERROR (pngdec, LIBRARY, FAILED, (NULL),
("returning from longjmp"));
return;
}
@ -302,8 +316,6 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
png_get_IHDR (pngdec->png, pngdec->info, &width, &height,
&depth, &color, NULL, NULL, NULL);
GST_LOG ("color type: %d\n", pngdec->info->color_type);
if (pngdec->width != width ||
pngdec->height != height ||
pngdec->color_type != pngdec->info->color_type) {
@ -312,6 +324,8 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
pngdec->color_type = pngdec->info->color_type;
if (GST_PAD_LINK_FAILED (gst_pad_renegotiate (pngdec->srcpad))) {
gst_buffer_unref (buf);
png_destroy_read_struct (&pngdec->png, &pngdec->info, &pngdec->endinfo);
GST_ELEMENT_ERROR (pngdec, CORE, NEGOTIATION, (NULL), (NULL));
return;
}
@ -319,14 +333,13 @@ gst_pngdec_chain (GstPad * pad, GstData * _data)
rows = (png_bytep *) g_malloc (sizeof (png_bytep) * height);
out =
gst_pad_alloc_buffer (pngdec->srcpad, GST_BUFFER_OFFSET_NONE,
width * height * 4);
out = gst_pad_alloc_buffer (pngdec->srcpad, GST_BUFFER_OFFSET_NONE,
height * pngdec->info->rowbytes);
inp = GST_BUFFER_DATA (out);
for (i = 0; i < height; i++) {
rows[i] = inp;
inp += width * 4;
inp += pngdec->info->rowbytes;
}
png_read_image (pngdec->png, rows);

30
ext/libpng/gstpngenc.c
View file

@ -160,6 +160,8 @@ gst_pngenc_sinklink (GstPad * pad, const GstCaps * caps)
GstPngEnc *pngenc;
gdouble fps;
GstStructure *structure;
GstCaps *pcaps;
GstPadLinkReturn ret;
pngenc = GST_PNGENC (gst_pad_get_parent (pad));
@ -169,12 +171,14 @@ gst_pngenc_sinklink (GstPad * pad, const GstCaps * caps)
gst_structure_get_double (structure, "framerate", &fps);
gst_structure_get_int (structure, "bpp", &pngenc->bpp);
caps = gst_caps_new_simple ("image/png",
pcaps = gst_caps_new_simple ("image/png",
"framerate", G_TYPE_DOUBLE, fps,
"width", G_TYPE_INT, pngenc->width,
"height", G_TYPE_INT, pngenc->height, NULL);
return gst_pad_try_set_caps (pngenc->srcpad, caps);
ret = gst_pad_try_set_caps (pngenc->srcpad, pcaps);
gst_caps_free (pcaps);
return ret;
}
static void
@ -250,20 +254,28 @@ gst_pngenc_chain (GstPad * pad, GstData * _data)
/* 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);
/* FIXME: better error handling */
if (pngenc->png_struct_ptr == NULL)
g_warning ("Failed to initialize png structure");
if (pngenc->png_struct_ptr == NULL) {
gst_buffer_unref (buf);
GST_ELEMENT_ERROR (pngenc, LIBRARY, INIT, (NULL),
("Failed to initialize png structure"));
return;
}
pngenc->png_info_ptr = png_create_info_struct (pngenc->png_struct_ptr);
if (!pngenc->png_info_ptr) {
png_destroy_read_struct (&(pngenc->png_struct_ptr), (png_infopp) NULL,
(png_infopp) NULL);
gst_buffer_unref (buf);
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;
}
/* non-0 return is from a longjmp inside of libpng */
if (setjmp (pngenc->png_struct_ptr->jmpbuf) != 0) {
GST_DEBUG ("returning from longjmp");
gst_buffer_unref (buf);
png_destroy_write_struct (&pngenc->png_struct_ptr, &pngenc->png_info_ptr);
GST_ELEMENT_ERROR (pngenc, LIBRARY, FAILED, (NULL),
("returning from longjmp"));
return;
}
@ -285,7 +297,7 @@ gst_pngenc_chain (GstPad * pad, GstData * _data)
for (row_index = 0; row_index < pngenc->height; row_index++)
row_pointers[row_index] = GST_BUFFER_DATA (buf) +
(pngenc->width * row_index * pngenc->bpp / 8);
(row_index * pngenc->png_info_ptr->rowbytes);
png_write_info (pngenc->png_struct_ptr, pngenc->png_info_ptr);
png_write_image (pngenc->png_struct_ptr, row_pointers);