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gstjpeg2000parse: improved parsing of jpc magic and j2c box

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https://bugzilla.gnome.org/show_bug.cgi?id=767512
This commit is contained in:
Aaron Boxer 2016-06-30 07:47:50 -04:00 committed by Luis de Bethencourt
parent 43a2ee8948
commit 154698389d
1 changed files with 43 additions and 44 deletions
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87
gst/videoparsers/gstjpeg2000parse.c
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@ -44,14 +44,16 @@ gst_jpeg2000_parse_get_subsampling (GstJPEG2000Sampling sampling, guint8 * dx,
}
}
#define GST_JPEG2000_PARSE_SIZE_OF_J2K_MAGIC 4
#define GST_JPEG2000_PARSE_SIZE_OF_J2C_BOX_SIZE 4
#define GST_JPEG2000_JP2_SIZE_OF_BOX_ID 4
#define GST_JPEG2000_JP2_SIZE_OF_BOX_LEN 4
#define GST_JPEG2000_MARKER_SIZE 4
/* J2C has 8 bytes preceding J2K magic: 4 for size of box, and 4 for fourcc */
#define GST_JPEG2000_PARSE_SIZE_OF_J2C_PREFIX_BYTES 8
#define GST_JPEG2000_PARSE_SIZE_OF_J2C_PREFIX_BYTES (GST_JPEG2000_JP2_SIZE_OF_BOX_LEN + GST_JPEG2000_JP2_SIZE_OF_BOX_ID)
/* SOC marker plus minimum size of SIZ marker */
#define GST_JPEG2000_PARSE_MIN_FRAME_SIZE (GST_JPEG2000_PARSE_SIZE_OF_J2K_MAGIC + GST_JPEG2000_PARSE_SIZE_OF_J2C_PREFIX_BYTES + 36)
#define GST_JPEG2000_PARSE_MIN_FRAME_SIZE (GST_JPEG2000_MARKER_SIZE + GST_JPEG2000_PARSE_SIZE_OF_J2C_PREFIX_BYTES + 36)
#define GST_JPEG2000_PARSE_J2K_MAGIC 0xFF4FFF51
@ -201,6 +203,7 @@ gst_jpeg2000_parse_handle_frame (GstBaseParse * parse,
guint num_prefix_bytes = 0; /* number of bytes to skip before actual code stream */
GstCaps *src_caps = NULL;
guint frame_size = 0;
gboolean is_j2c = jpeg2000parse->codec_format == GST_JPEG2000_PARSE_J2C;
if (!gst_buffer_map (frame->buffer, &map, GST_MAP_READ)) {
GST_ERROR_OBJECT (jpeg2000parse, "Unable to map buffer");
@ -208,9 +211,11 @@ gst_jpeg2000_parse_handle_frame (GstBaseParse * parse,
}
gst_byte_reader_init (&reader, map.data, map.size);
num_prefix_bytes = GST_JPEG2000_PARSE_SIZE_OF_J2K_MAGIC;
num_prefix_bytes = GST_JPEG2000_MARKER_SIZE;
if (jpeg2000parse->codec_format == GST_JPEG2000_PARSE_J2C) {
if (is_j2c) {
num_prefix_bytes +=
GST_JPEG2000_JP2_SIZE_OF_BOX_LEN + GST_JPEG2000_JP2_SIZE_OF_BOX_ID;
/* check for "jp2c" */
j2c_box_id_offset = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffffff,
GST_MAKE_FOURCC ('j', 'p', '2', 'c'), 0,
@ -231,54 +236,48 @@ gst_jpeg2000_parse_handle_frame (GstBaseParse * parse,
*skipsize = gst_byte_reader_get_size (&reader) - num_prefix_bytes;
goto beach;
} else {
if (jpeg2000parse->codec_format == GST_JPEG2000_PARSE_J2C) {
/* check for corrupt contiguous code stream box */
if (j2c_box_id_offset + GST_JPEG2000_PARSE_SIZE_OF_J2K_MAGIC !=
magic_offset) {
GST_ELEMENT_ERROR (jpeg2000parse, STREAM, DECODE, NULL,
("Corrupt contiguous code stream box for j2c stream"));
ret = GST_FLOW_ERROR;
goto beach;
}
/* check for missing contiguous code stream box size */
if (j2c_box_id_offset < GST_JPEG2000_PARSE_SIZE_OF_J2C_BOX_SIZE) {
GST_ELEMENT_ERROR (jpeg2000parse, STREAM, DECODE, NULL,
("Missing contiguous code stream box size for j2c stream"));
ret = GST_FLOW_ERROR;
goto beach;
}
/* check that we have enough bytes for the J2C box size */
if (j2c_box_id_offset < GST_JPEG2000_PARSE_SIZE_OF_J2C_BOX_SIZE) {
*skipsize = gst_byte_reader_get_size (&reader) - num_prefix_bytes;
goto beach;
}
if (!gst_byte_reader_skip (&reader,
j2c_box_id_offset - GST_JPEG2000_PARSE_SIZE_OF_J2C_BOX_SIZE))
goto beach;
/* read the box size, and adjust num_prefix_bytes accordingly */
if (!gst_byte_reader_get_uint32_be (&reader, &frame_size))
goto beach;
num_prefix_bytes += GST_JPEG2000_PARSE_SIZE_OF_J2C_PREFIX_BYTES -
GST_JPEG2000_PARSE_SIZE_OF_J2C_BOX_SIZE;
}
/* see if we need to skip any bytes at beginning of frame */
GST_DEBUG_OBJECT (jpeg2000parse, "Found magic at offset = %d",
magic_offset);
if (magic_offset > 0) {
*skipsize = magic_offset;
/* J2C has 8 bytes preceding J2K magic */
if (jpeg2000parse->codec_format == GST_JPEG2000_PARSE_J2C)
if (is_j2c)
*skipsize -= GST_JPEG2000_PARSE_SIZE_OF_J2C_PREFIX_BYTES;
if (*skipsize > 0)
goto beach;
}
/* bail out if not enough data for frame */
if (frame_size && (gst_byte_reader_get_size (&reader) < frame_size))
goto beach;
if (is_j2c) {
/* sanity check on box id offset */
if (j2c_box_id_offset + GST_JPEG2000_JP2_SIZE_OF_BOX_ID != magic_offset) {
GST_ELEMENT_ERROR (jpeg2000parse, STREAM, DECODE, NULL,
("Corrupt contiguous code stream box for j2c stream"));
ret = GST_FLOW_ERROR;
goto beach;
}
/* check that we have enough bytes for the J2C box length */
if (j2c_box_id_offset < GST_JPEG2000_JP2_SIZE_OF_BOX_LEN) {
*skipsize = gst_byte_reader_get_size (&reader) - num_prefix_bytes;
goto beach;
}
if (!gst_byte_reader_skip (&reader,
j2c_box_id_offset - GST_JPEG2000_JP2_SIZE_OF_BOX_LEN))
goto beach;
/* read the box length, and adjust num_prefix_bytes accordingly */
if (!gst_byte_reader_get_uint32_be (&reader, &frame_size))
goto beach;
num_prefix_bytes -= GST_JPEG2000_JP2_SIZE_OF_BOX_LEN;
/* bail out if not enough data for frame */
if ((gst_byte_reader_get_size (&reader) < frame_size))
goto beach;
}
}
/* 2 to skip marker size, and another 2 to skip rsiz field */