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jpeg2000parse: allow parsing when current caps are null

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In this case, we assume that the format is jpc, and we infer the color
space from the number of components. This allows the parser to process a
jpc disk file coming from a filesrc element.

https://bugzilla.gnome.org/show_bug.cgi?id=783291
This commit is contained in:
Aaron Boxer 2017-06-12 09:47:49 -04:00 committed by Sebastian Dröge
parent eebc4c0022
commit 2cffa1579a
1 changed files with 70 additions and 42 deletions
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84
gst/videoparsers/gstjpeg2000parse.c
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@ -108,13 +108,7 @@ static GstStaticPadTemplate srctemplate =
static GstStaticPadTemplate sinktemplate =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/x-jpc,"
GST_JPEG2000_SAMPLING_LIST ";"
"image/x-jpc, "
GST_JPEG2000_COLORSPACE_LIST ";"
"image/x-j2c,"
GST_JPEG2000_SAMPLING_LIST ";"
"image/x-j2c, " GST_JPEG2000_COLORSPACE_LIST)
GST_STATIC_CAPS ("image/x-jpc;image/x-j2c")
);
#define parent_class gst_jpeg2000_parse_parent_class
@ -250,17 +244,12 @@ gst_jpeg2000_parse_negotiate (GstJPEG2000Parse * parse, GstCaps * in_caps)
}
}
/* FIXME We could fail the negotiation immediatly if caps are empty */
if (caps && !gst_caps_is_empty (caps)) {
/* fixate to avoid ambiguity with lists when parsing */
caps = gst_caps_fixate (caps);
codec_format = format_from_media_type (gst_caps_get_structure (caps, 0));
}
/* default */
if (codec_format == GST_JPEG2000_PARSE_NO_CODEC)
codec_format = GST_JPEG2000_PARSE_J2C;
GST_DEBUG_OBJECT (parse, "selected codec format %d", codec_format);
parse->codec_format = codec_format;
@ -296,7 +285,6 @@ gst_jpeg2000_parse_handle_frame (GstBaseParse * parse,
guint eoc_offset = 0;
GstCaps *current_caps = NULL;
GstStructure *current_caps_struct = NULL;
const gchar *colorspace_string = NULL;
GstJPEG2000Colorspace colorspace = GST_JPEG2000_COLORSPACE_NONE;
guint x0, y0, x1, y1;
guint width = 0, height = 0;
@ -319,27 +307,45 @@ gst_jpeg2000_parse_handle_frame (GstBaseParse * parse,
GstCaps *src_caps = NULL;
guint frame_size = 0;
gboolean is_j2c;
gboolean parsed_j2c_4cc = FALSE;
if (!gst_buffer_map (frame->buffer, &map, GST_MAP_READ)) {
GST_ERROR_OBJECT (jpeg2000parse, "Unable to map buffer");
return GST_FLOW_ERROR;
}
gst_byte_reader_init (&reader, map.data, map.size);
/* try to get from caps */
if (jpeg2000parse->codec_format == GST_JPEG2000_PARSE_NO_CODEC)
gst_jpeg2000_parse_negotiate (jpeg2000parse, NULL);
is_j2c = jpeg2000parse->codec_format == GST_JPEG2000_PARSE_J2C;
gst_byte_reader_init (&reader, map.data, map.size);
num_prefix_bytes = GST_JPEG2000_MARKER_SIZE;
if (is_j2c) {
num_prefix_bytes +=
GST_JPEG2000_JP2_SIZE_OF_BOX_LEN + GST_JPEG2000_JP2_SIZE_OF_BOX_ID;
/* if we can't get from caps, then try to parse */
if (jpeg2000parse->codec_format == GST_JPEG2000_PARSE_NO_CODEC) {
/* check for "jp2c" */
j2c_box_id_offset = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffffff,
GST_MAKE_FOURCC ('j', 'p', '2', 'c'), 0,
gst_byte_reader_get_remaining (&reader));
parsed_j2c_4cc = TRUE;
is_j2c = j2c_box_id_offset != -1;
/* since we only support j2c and jpc at the moment, we can deduce the codec format */
jpeg2000parse->codec_format =
is_j2c ? GST_JPEG2000_PARSE_J2C : GST_JPEG2000_PARSE_JPC;
} else {
is_j2c = jpeg2000parse->codec_format == GST_JPEG2000_PARSE_J2C;
}
num_prefix_bytes = GST_JPEG2000_MARKER_SIZE;
if (is_j2c) {
num_prefix_bytes +=
GST_JPEG2000_JP2_SIZE_OF_BOX_LEN + GST_JPEG2000_JP2_SIZE_OF_BOX_ID;
/* check for "jp2c" (may have already parsed j2c_box_id_offset if caps are empty) */
if (!parsed_j2c_4cc) {
j2c_box_id_offset =
gst_byte_reader_masked_scan_uint32 (&reader, 0xffffffff,
GST_MAKE_FOURCC ('j', 'p', '2', 'c'), 0,
gst_byte_reader_get_remaining (&reader));
}
if (j2c_box_id_offset == -1) {
GST_ELEMENT_ERROR (jpeg2000parse, STREAM, DECODE, NULL,
@ -480,12 +486,8 @@ gst_jpeg2000_parse_handle_frame (GstBaseParse * parse,
}
current_caps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (parse));
if (!current_caps) {
GST_ERROR_OBJECT (jpeg2000parse, "Unable to get current caps");
ret = GST_FLOW_NOT_NEGOTIATED;
goto beach;
}
if (current_caps) {
const gchar *colorspace_string = NULL;
current_caps_struct = gst_caps_get_structure (current_caps, 0);
if (!current_caps_struct) {
GST_ERROR_OBJECT (jpeg2000parse,
@ -503,6 +505,28 @@ gst_jpeg2000_parse_handle_frame (GstBaseParse * parse,
if (sink_sampling_string)
sink_sampling = gst_jpeg2000_sampling_from_string (sink_sampling_string);
} else {
/* guess color space based on number of components */
if (numcomps == 0 || numcomps > 4) {
GST_ERROR_OBJECT (jpeg2000parse,
"Unable to guess color space from number of components %d", numcomps);
ret = GST_FLOW_NOT_NEGOTIATED;
goto beach;
}
colorspace =
(numcomps >=
3) ? GST_JPEG2000_COLORSPACE_RGB : GST_JPEG2000_COLORSPACE_GRAY;
if (numcomps == 4) {
GST_WARNING_OBJECT (jpeg2000parse, "No caps available: assuming RGBA");
} else if (numcomps == 3) {
GST_WARNING_OBJECT (jpeg2000parse, "No caps available: assuming RGB");
} else if (numcomps == 2) {
GST_WARNING_OBJECT (jpeg2000parse,
"No caps available: assuming grayscale with alpha");
}
}
for (compno = 0; compno < numcomps; ++compno) {
/* skip Ssiz (precision and signed/unsigned bit ) */
@ -651,13 +675,15 @@ gst_jpeg2000_parse_handle_frame (GstBaseParse * parse,
}
}
if (gst_structure_get_fraction (current_caps_struct, "framerate", &fr_num,
if (current_caps_struct &&
gst_structure_get_fraction (current_caps_struct, "framerate", &fr_num,
&fr_denom)) {
gst_caps_set_simple (src_caps, "framerate", GST_TYPE_FRACTION, fr_num,
fr_denom, NULL);
} else {
GST_WARNING_OBJECT (jpeg2000parse, "No framerate set");
}
if (!gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), src_caps)) {
GST_ERROR_OBJECT (jpeg2000parse, "Unable to set source caps");
ret = GST_FLOW_NOT_NEGOTIATED;
@ -690,6 +716,8 @@ gst_jpeg2000_parse_handle_frame (GstBaseParse * parse,
frame_size, eoc_frame_size);
}
frame_size = eoc_frame_size;
} else {
goto beach;
}
/* clean up and finish frame */