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pnmdec: Implementation of GRAY16 handling

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=757022
This commit is contained in:
Dimitrios Katsaros 2015-10-22 17:06:01 +02:00 committed by Jan Schmidt
parent 61440e58c1
commit 88a9b151c1
3 changed files with 103 additions and 11 deletions
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107
gst/pnm/gstpnmdec.c
View file

@ -57,11 +57,11 @@ gst_pnmdec_parse_ascii (GstPnmdec * s, const guint8 * b, guint bs);
G_DEFINE_TYPE (GstPnmdec, gst_pnmdec, GST_TYPE_VIDEO_DECODER);
static GstStaticPadTemplate gst_pnmdec_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("RGB") "; "
GST_VIDEO_CAPS_MAKE ("GRAY8")));
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE
("{ RGB, GRAY8, GRAY16_BE, GRAY16_LE }")));
static GstStaticPadTemplate gst_pnmdec_sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink",
@ -69,6 +69,8 @@ GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_ALWAYS,
GST_STATIC_CAPS (MIME_ALL));
GST_DEBUG_CATEGORY (pnmdecoder_debug);
#define GST_CAT_DEFAULT pnmdecoder_debug
static void
gst_pnmdec_class_init (GstPnmdecClass * klass)
@ -76,10 +78,13 @@ gst_pnmdec_class_init (GstPnmdecClass * klass)
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstVideoDecoderClass *vdec_class = (GstVideoDecoderClass *) klass;
GST_DEBUG_CATEGORY_INIT (pnmdecoder_debug, "pnmdec", 0, "PNM Video Decoder");
gst_element_class_add_static_pad_template (element_class,
&gst_pnmdec_src_pad_template);
gst_element_class_add_static_pad_template (element_class,
&gst_pnmdec_sink_pad_template);
gst_element_class_set_static_metadata (element_class, "PNM image decoder",
"Codec/Decoder/Image",
"Decodes images in portable pixmap/graymap/bitmap/anymamp (PNM) format",
@ -116,11 +121,74 @@ gst_pnmdec_init (GstPnmdec * s)
GST_PAD_SET_ACCEPT_TEMPLATE (GST_VIDEO_DECODER_SINK_PAD (s));
}
static void
gst_pnmdec_resolve_gray16_format (GstVideoDecoder * decoder)
{
GstPnmdec *pnmdec = (GstPnmdec *) decoder;
GstCaps *peercaps;
GstStructure *peerstruct;
gint i, j;
const GValue *svalue, *lvalue;
const gchar *fmtstr = NULL;
GstVideoFormat fmt = GST_VIDEO_FORMAT_UNKNOWN;
/* perform some basic negotiation to resolve which endianess, if any is supported by the
* component downstream
*/
peercaps = gst_pad_peer_query_caps (decoder->srcpad, NULL);
if (!gst_caps_is_empty (peercaps) && !gst_caps_is_any (peercaps)) {
GST_DEBUG ("Received caps from peer: %" GST_PTR_FORMAT, peercaps);
for (i = 0; i < gst_caps_get_size (peercaps); i++) {
peerstruct = gst_caps_get_structure (peercaps, i);
if (peerstruct) {
svalue = gst_structure_get_value (peerstruct, "format");
/* if it is fixated, check if it is a GRAY16 format */
if (G_VALUE_TYPE (svalue) == G_TYPE_STRING) {
fmtstr = gst_structure_get_string (peerstruct, "format");
if (fmtstr && g_str_equal (fmtstr, "GRAY16_BE")) {
fmt = GST_VIDEO_FORMAT_GRAY16_BE;
} else if (fmtstr && g_str_equal (fmtstr, "GRAY16_LE")) {
fmt = GST_VIDEO_FORMAT_GRAY16_LE;
}
}
/* if layout is not fixated, check for BE and LE, prioritizing BE */
else if (G_VALUE_TYPE (svalue) == GST_TYPE_LIST) {
for (j = 0; j < gst_value_list_get_size (svalue); j++) {
lvalue = gst_value_list_get_value (svalue, j);
if (lvalue && G_VALUE_TYPE (lvalue) == G_TYPE_STRING) {
fmtstr = g_value_get_string (lvalue);
if (fmtstr && g_str_equal (fmtstr, "GRAY16_BE")) {
GST_DEBUG ("Found GRAY16_BE, setting pnm 16bit format");
fmt = GST_VIDEO_FORMAT_GRAY16_BE;
break;
} else if (fmtstr && g_str_equal (fmtstr, "GRAY16_LE")) {
GST_DEBUG ("Found GRAY16_LE, setting pnm 16bit format");
fmt = GST_VIDEO_FORMAT_GRAY16_LE;
}
}
}
}
}
if (fmt == GST_VIDEO_FORMAT_GRAY16_BE)
break;
}
}
gst_caps_unref (peercaps);
/* if no negotiation was achieved we default to big endian. */
if (fmt == GST_VIDEO_FORMAT_UNKNOWN) {
GST_DEBUG ("No 16bit format detected, defaulting to GRAY16_BE");
pnmdec->gray16format = GST_VIDEO_FORMAT_GRAY16_BE;
} else
pnmdec->gray16format = fmt;
}
static gboolean
gst_pnmdec_set_format (GstVideoDecoder * decoder, GstVideoCodecState * state)
{
GstPnmdec *pnmdec = (GstPnmdec *) decoder;
gst_pnmdec_resolve_gray16_format (decoder);
if (pnmdec->input_state)
gst_video_codec_state_unref (pnmdec->input_state);
pnmdec->input_state = gst_video_codec_state_ref (state);
@ -172,7 +240,7 @@ gst_pnmdec_parse_ascii (GstPnmdec * s, const guint8 * b, guint bs)
goto drop_error;
}
}
if (s->last_byte > 255) {
if (s->last_byte > s->mngr.info.max) {
GST_DEBUG_OBJECT (s, "Corrupt ASCII encoded PNM file.");
goto drop_error;
}
@ -269,7 +337,10 @@ gst_pnmdec_handle_frame (GstVideoDecoder * decoder, GstVideoCodecFrame * frame)
i_rowstride = 3 * s->mngr.info.width;
o_rowstride = GST_ROUND_UP_4 (i_rowstride);
} else {
i_rowstride = s->mngr.info.width;
if (s->mngr.info.max > 255)
i_rowstride = s->mngr.info.width * 2;
else
i_rowstride = s->mngr.info.width;
o_rowstride = GST_ROUND_UP_4 (i_rowstride);
}
@ -284,7 +355,19 @@ gst_pnmdec_handle_frame (GstVideoDecoder * decoder, GstVideoCodecFrame * frame)
if (s->mngr.info.type != GST_PNM_TYPE_BITMAP) {
/* Convert the pixels from 0 - max range to 0 - 255 range */
if (s->mngr.info.max < 255) {
if (s->mngr.info.max > 255 && s->mngr.info.max < 65535) {
guint16 *data = (guint16 *) omap.data;
gint max = s->mngr.info.max;
for (i = 0; i < total_bytes / 2; i++) {
if (data[i] <= max) {
data[i] = 65535 * data[i] / max;
} else {
/* This is an error case, wherein value in the data stream is
more than max. Clamp such values to 255 */
data[i] = 65535;
}
}
} else if (s->mngr.info.max < 255) {
gint max = s->mngr.info.max;
for (i = 0; i < total_bytes; i++) {
if (omap.data[i] <= max) {
@ -356,8 +439,13 @@ gst_pnmdec_parse (GstVideoDecoder * decoder, GstVideoCodecFrame * frame,
format = GST_VIDEO_FORMAT_GRAY8;
break;
case GST_PNM_TYPE_GRAYMAP:
s->size = s->mngr.info.width * s->mngr.info.height * 1;
format = GST_VIDEO_FORMAT_GRAY8;
if (s->mngr.info.max > 255) {
s->size = s->mngr.info.width * s->mngr.info.height * 2;
format = s->gray16format;
} else {
s->size = s->mngr.info.width * s->mngr.info.height * 1;
format = GST_VIDEO_FORMAT_GRAY8;
}
break;
case GST_PNM_TYPE_PIXMAP:
s->size = s->mngr.info.width * s->mngr.info.height * 3;
@ -387,7 +475,7 @@ gst_pnmdec_parse (GstVideoDecoder * decoder, GstVideoCodecFrame * frame,
}
if (s->mngr.info.encoding == GST_PNM_ENCODING_ASCII) {
/* Parse ASCII data dn populate s->current_size with the number of
/* Parse ASCII data dn populate s->current_size with the number of
bytes actually parsed from the input data */
r = gst_pnmdec_parse_ascii (s, raw_data + offset, size);
} else {
@ -417,7 +505,6 @@ static gboolean
gst_pnmdec_start (GstVideoDecoder * decoder)
{
GstPnmdec *pnmdec = (GstPnmdec *) decoder;
gst_video_decoder_set_packetized (GST_VIDEO_DECODER (pnmdec), FALSE);
return TRUE;
}

1
gst/pnm/gstpnmdec.h
View file

@ -44,6 +44,7 @@ struct _GstPnmdec
GstVideoCodecState *input_state;
guint size, last_byte, current_size ;
GstBuffer *buf;
GstVideoFormat gray16format;
};
struct _GstPnmdecClass

6
gst/pnm/gstpnmutils.c
View file

@ -178,7 +178,11 @@ gst_pnm_info_mngr_scan (GstPnmInfoMngr * mngr, const guint8 * buf,
case ' ':
/* Check for maximum and minimum supported bit depth and
return error if its out of range */
if ((mngr->info.max > 255) || (mngr->info.max < 1)) {
if (mngr->info.type == GST_PNM_TYPE_GRAYMAP) {
if ((mngr->info.max > 65535) || (mngr->info.max < 1)) {
return GST_PNM_INFO_MNGR_RESULT_FAILED;
}
} else if ((mngr->info.max > 255) || (mngr->info.max < 1)) {
return GST_PNM_INFO_MNGR_RESULT_FAILED;
}
mngr->info.fields |= GST_PNM_INFO_FIELDS_MAX;