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gstreamer/gst/videoparsers/gstjpeg2000parse.c
Luis de Bethencourt 418e643b61 gstjpeg2000parse: no need for else after a goto 
else clause is redundant when the end of the if statement is a jump.
If we haven't gone to the beach, we are in the false branch.
2016-07-01 14:08:13 +01:00

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/* GStreamer JPEG 2000 Parser
* Copyright (C) <2016> Grok Image Compession Inc.
* @author Aaron Boxer <boxerab@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstjpeg2000parse.h"
#include <gst/base/base.h>
static void
gst_jpeg2000_parse_get_subsampling (GstJPEG2000Sampling sampling, guint8 * dx,
guint8 * dy)
{
*dx = 1;
*dy = 1;
if (sampling == GST_JPEG2000_SAMPLING_YBR422) {
*dx = 2;
} else if (sampling == GST_JPEG2000_SAMPLING_YBR420) {
*dx = 2;
*dy = 2;
} else if (sampling == GST_JPEG2000_SAMPLING_YBR410) {
*dx = 4;
*dy = 2;
}
}
#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 (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_MARKER_SIZE + GST_JPEG2000_PARSE_SIZE_OF_J2C_PREFIX_BYTES + 36)
#define GST_JPEG2000_PARSE_J2K_MAGIC 0xFF4FFF51
GST_DEBUG_CATEGORY (jpeg2000_parse_debug);
#define GST_CAT_DEFAULT jpeg2000_parse_debug
static GstStaticPadTemplate srctemplate =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/x-jpc,"
" width = (int)[1, MAX], height = (int)[1, MAX],"
GST_JPEG2000_SAMPLING_LIST ","
GST_JPEG2000_COLORSPACE_LIST ","
" parsed = (boolean) true;"
"image/x-j2c,"
" width = (int)[1, MAX], height = (int)[1, MAX],"
GST_JPEG2000_SAMPLING_LIST ","
GST_JPEG2000_COLORSPACE_LIST "," " parsed = (boolean) true")
);
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)
);
#define parent_class gst_jpeg2000_parse_parent_class
G_DEFINE_TYPE (GstJPEG2000Parse, gst_jpeg2000_parse, GST_TYPE_BASE_PARSE);
static gboolean gst_jpeg2000_parse_start (GstBaseParse * parse);
static gboolean gst_jpeg2000_parse_event (GstBaseParse * parse,
GstEvent * event);
static GstFlowReturn gst_jpeg2000_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize);
static gboolean gst_jpeg2000_parse_set_sink_caps (GstBaseParse * parse,
GstCaps * caps);
static void
gst_jpeg2000_parse_class_init (GstJPEG2000ParseClass * klass)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (jpeg2000_parse_debug, "jpeg2000parse", 0,
"jpeg 2000 parser");
gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
gst_element_class_set_static_metadata (gstelement_class, "JPEG 2000 parser",
"Codec/Parser/Video/Image",
"Parses JPEG 2000 files", "Aaron Boxer <boxerab@gmail.com>");
/* Override BaseParse vfuncs */
parse_class->set_sink_caps =
GST_DEBUG_FUNCPTR (gst_jpeg2000_parse_set_sink_caps);
parse_class->start = GST_DEBUG_FUNCPTR (gst_jpeg2000_parse_start);
parse_class->sink_event = GST_DEBUG_FUNCPTR (gst_jpeg2000_parse_event);
parse_class->handle_frame =
GST_DEBUG_FUNCPTR (gst_jpeg2000_parse_handle_frame);
}
static gboolean
gst_jpeg2000_parse_start (GstBaseParse * parse)
{
GstJPEG2000Parse *jpeg2000parse = GST_JPEG2000_PARSE (parse);
GST_DEBUG_OBJECT (jpeg2000parse, "start");
gst_base_parse_set_min_frame_size (parse, GST_JPEG2000_PARSE_MIN_FRAME_SIZE);
jpeg2000parse->width = 0;
jpeg2000parse->height = 0;
jpeg2000parse->sampling = GST_JPEG2000_SAMPLING_NONE;
jpeg2000parse->colorspace = GST_JPEG2000_COLORSPACE_NONE;
jpeg2000parse->codec_format = GST_JPEG2000_PARSE_NO_CODEC;
return TRUE;
}
static void
gst_jpeg2000_parse_init (GstJPEG2000Parse * jpeg2000parse)
{
GST_PAD_SET_ACCEPT_INTERSECT (GST_BASE_PARSE_SINK_PAD (jpeg2000parse));
GST_PAD_SET_ACCEPT_TEMPLATE (GST_BASE_PARSE_SINK_PAD (jpeg2000parse));
}
static gboolean
gst_jpeg2000_parse_set_sink_caps (GstBaseParse * parse, GstCaps * caps)
{
GstJPEG2000Parse *jpeg2000parse = GST_JPEG2000_PARSE (parse);
GstStructure *caps_struct = gst_caps_get_structure (caps, 0);
if (gst_structure_has_name (caps_struct, "image/jp2")) {
jpeg2000parse->codec_format = GST_JPEG2000_PARSE_JP2;
} else if (gst_structure_has_name (caps_struct, "image/x-j2c")) {
jpeg2000parse->codec_format = GST_JPEG2000_PARSE_J2C;
} else if (gst_structure_has_name (caps_struct, "image/x-jpc")) {
jpeg2000parse->codec_format = GST_JPEG2000_PARSE_JPC;
}
return TRUE;
}
static gboolean
gst_jpeg2000_parse_event (GstBaseParse * parse, GstEvent * event)
{
gboolean res = GST_BASE_PARSE_CLASS (parent_class)->sink_event (parse, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
gst_base_parse_set_min_frame_size (parse,
GST_JPEG2000_PARSE_MIN_FRAME_SIZE);
break;
default:
break;
}
return res;
}
static GstFlowReturn
gst_jpeg2000_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize)
{
GstJPEG2000Parse *jpeg2000parse = GST_JPEG2000_PARSE (parse);
GstMapInfo map;
GstByteReader reader;
GstFlowReturn ret = GST_FLOW_OK;
guint eoc_offset = 0;
GstCaps *current_caps = NULL;
GstStructure *current_caps_struct = NULL;
GstJPEG2000Colorspace colorspace = GST_JPEG2000_COLORSPACE_NONE;
guint x0, y0, x1, y1;
guint width = 0, height = 0;
guint8 dx[GST_JPEG2000_PARSE_MAX_SUPPORTED_COMPONENTS];
guint8 dy[GST_JPEG2000_PARSE_MAX_SUPPORTED_COMPONENTS];
guint16 numcomps;
guint16 compno;
GstJPEG2000Sampling parsed_sampling = GST_JPEG2000_SAMPLING_NONE;
GstJPEG2000Sampling sink_sampling = GST_JPEG2000_SAMPLING_NONE;
GstJPEG2000Sampling source_sampling = GST_JPEG2000_SAMPLING_NONE;
guint magic_offset = 0;
guint j2c_box_id_offset = 0;
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");
return GST_FLOW_ERROR;
}
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;
/* 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));
if (j2c_box_id_offset == -1) {
GST_ELEMENT_ERROR (jpeg2000parse, STREAM, DECODE, NULL,
("Missing contiguous code stream box for j2c stream"));
ret = GST_FLOW_ERROR;
goto beach;
}
}
/* Look for magic. If found, skip to beginning of frame */
magic_offset = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffffff,
GST_JPEG2000_PARSE_J2K_MAGIC, 0, gst_byte_reader_get_remaining (&reader));
if (magic_offset == -1) {
*skipsize = gst_byte_reader_get_size (&reader) - num_prefix_bytes;
goto beach;
}
/* 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 (is_j2c)
*skipsize -= GST_JPEG2000_PARSE_SIZE_OF_J2C_PREFIX_BYTES;
if (*skipsize > 0)
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 */
if (!gst_byte_reader_skip (&reader, num_prefix_bytes + 2 + 2))
goto beach;
if (!gst_byte_reader_get_uint32_be (&reader, &x1))
goto beach;
if (!gst_byte_reader_get_uint32_be (&reader, &y1))
goto beach;
if (!gst_byte_reader_get_uint32_be (&reader, &x0))
goto beach;
if (!gst_byte_reader_get_uint32_be (&reader, &y0))
goto beach;
/* sanity check on image dimensions */
if (x1 < x0 || y1 < y0) {
GST_ELEMENT_ERROR (jpeg2000parse, STREAM, DECODE, NULL,
("Nonsensical image dimensions %d,%d,%d,%d", x0, y0, x1, y1));
ret = GST_FLOW_ERROR;
goto beach;
}
width = x1 - x0;
height = y1 - y0;
GST_DEBUG_OBJECT (jpeg2000parse, "Parsed image dimensions %d,%d", width,
height);
/* skip tile dimensions */
if (!gst_byte_reader_skip (&reader, 4 * 4))
goto beach;
/* read number of components */
if (!gst_byte_reader_get_uint16_be (&reader, &numcomps))
goto beach;
if (numcomps == 2 || numcomps > GST_JPEG2000_PARSE_MAX_SUPPORTED_COMPONENTS) {
GST_ELEMENT_ERROR (jpeg2000parse, STREAM, DECODE, NULL,
("Unsupported number of components %d", numcomps));
ret = GST_FLOW_NOT_NEGOTIATED;
goto beach;
}
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;
}
current_caps_struct = gst_caps_get_structure (current_caps, 0);
if (!current_caps_struct) {
GST_ERROR_OBJECT (jpeg2000parse,
"Unable to get structure of current caps struct");
ret = GST_FLOW_NOT_NEGOTIATED;
goto beach;
}
colorspace =
gst_jpeg2000_colorspace_from_string (gst_structure_get_string
(current_caps_struct, "colorspace"));
sink_sampling =
gst_jpeg2000_sampling_from_string (gst_structure_get_string
(current_caps_struct, "sampling"));
for (compno = 0; compno < numcomps; ++compno) {
/* skip Ssiz (precision and signed/unsigned bit ) */
if (!gst_byte_reader_skip (&reader, 1))
goto beach;
if (!gst_byte_reader_get_uint8 (&reader, dx + compno))
goto beach;
if (!gst_byte_reader_get_uint8 (&reader, dy + compno))
goto beach;
GST_DEBUG_OBJECT (jpeg2000parse,
"Parsed sub-sampling %d,%d for component %d", dx[compno], dy[compno],
compno);
}
/*** sanity check on sub-sampling *****/
if (dx[0] != 1 || dy[0] != 1) {
GST_WARNING_OBJECT (jpeg2000parse, "Sub-sampled luma channel");
}
if (dx[1] != dx[2] || dy[1] != dy[2]) {
GST_WARNING_OBJECT (jpeg2000parse,
"Chroma channel sub-sampling factors are not equal");
}
for (compno = 0; compno < numcomps; ++compno) {
if (colorspace != GST_JPEG2000_COLORSPACE_NONE
&& (colorspace != GST_JPEG2000_COLORSPACE_YUV)
&& (dx[compno] > 1 || dy[compno] > 1)) {
GST_WARNING_OBJECT (jpeg2000parse,
"Sub-sampled RGB or monochrome color spaces");
}
if (sink_sampling != GST_JPEG2000_SAMPLING_NONE) {
guint8 dx_caps, dy_caps;
gst_jpeg2000_parse_get_subsampling (sink_sampling, &dx_caps, &dy_caps);
if (dx_caps != dx[compno] || dy_caps != dy[compno]) {
GstJPEG2000Colorspace inferred_colorspace =
GST_JPEG2000_COLORSPACE_NONE;
GST_WARNING_OBJECT (jpeg2000parse,
"Sink caps sub-sampling %d,%d for channel %d does not match stream sub-sampling %d,%d",
dx_caps, dy_caps, compno, dx[compno], dy[compno]);
/* try to guess correct color space */
if (gst_jpeg2000_sampling_is_mono (sink_sampling))
inferred_colorspace = GST_JPEG2000_COLORSPACE_GRAY;
else if (gst_jpeg2000_sampling_is_rgb (sink_sampling))
inferred_colorspace = GST_JPEG2000_COLORSPACE_RGB;
else if (gst_jpeg2000_sampling_is_yuv (sink_sampling))
inferred_colorspace = GST_JPEG2000_COLORSPACE_YUV;
else if (colorspace)
inferred_colorspace = colorspace;
if (inferred_colorspace != GST_JPEG2000_COLORSPACE_NONE) {
sink_sampling = GST_JPEG2000_SAMPLING_NONE;
colorspace = inferred_colorspace;
break;
} else {
/* unrecognized sink_sampling and no colorspace */
GST_ERROR_OBJECT (jpeg2000parse,
"Unrecognized sink sampling field and no sink colorspace field");
ret = GST_FLOW_NOT_NEGOTIATED;
goto beach;
}
}
}
}
/*************************************/
/* if colorspace is present, we can work out the parsed_sampling field */
if (colorspace != GST_JPEG2000_COLORSPACE_NONE) {
if (colorspace == GST_JPEG2000_COLORSPACE_YUV) {
if (numcomps == 4) {
guint i;
parsed_sampling = GST_JPEG2000_SAMPLING_YBRA4444_EXT;
for (i = 0; i < 4; ++i) {
if (dx[i] > 1 || dy[i] > 1) {
GST_WARNING_OBJECT (jpeg2000parse, "Sub-sampled YUVA images");
}
}
} else if (numcomps == 3) {
/* use sub-sampling from U chroma channel */
if (dx[1] == 1 && dy[1] == 1) {
parsed_sampling = GST_JPEG2000_SAMPLING_YBR444;
} else if (dx[1] == 2 && dy[1] == 2) {
parsed_sampling = GST_JPEG2000_SAMPLING_YBR420;
} else if (dx[1] == 4 && dy[1] == 2) {
parsed_sampling = GST_JPEG2000_SAMPLING_YBR410;
} else if (dx[1] == 2 && dy[1] == 1) {
parsed_sampling = GST_JPEG2000_SAMPLING_YBR422;
} else {
GST_WARNING_OBJECT (jpeg2000parse,
"Unsupported sub-sampling factors %d,%d", dx[1], dy[1]);
/* best effort */
parsed_sampling = GST_JPEG2000_SAMPLING_YBR444;
}
}
} else if (colorspace == GST_JPEG2000_COLORSPACE_GRAY) {
parsed_sampling = GST_JPEG2000_SAMPLING_GRAYSCALE;
} else {
parsed_sampling =
(numcomps ==
4) ? GST_JPEG2000_SAMPLING_RGBA : GST_JPEG2000_COLORSPACE_RGB;
}
} else {
if (gst_jpeg2000_sampling_is_mono (sink_sampling)) {
colorspace = GST_JPEG2000_COLORSPACE_GRAY;
} else if (gst_jpeg2000_sampling_is_rgb (sink_sampling)) {
colorspace = GST_JPEG2000_COLORSPACE_RGB;
} else {
/* best effort */
colorspace = GST_JPEG2000_COLORSPACE_YUV;
}
}
/* now we can set the source caps, if something has changed */
source_sampling =
sink_sampling !=
GST_JPEG2000_SAMPLING_NONE ? sink_sampling : parsed_sampling;
if (width != jpeg2000parse->width || height != jpeg2000parse->height
|| jpeg2000parse->sampling != source_sampling
|| jpeg2000parse->colorspace != colorspace) {
gint fr_num = 0, fr_denom = 0;
jpeg2000parse->width = width;
jpeg2000parse->height = height;
jpeg2000parse->sampling = source_sampling;
jpeg2000parse->colorspace = colorspace;
src_caps =
gst_caps_new_simple (gst_structure_get_name (current_caps_struct),
"width", G_TYPE_INT, width, "height", G_TYPE_INT, height,
"colorspace", G_TYPE_STRING,
gst_jpeg2000_colorspace_to_string (colorspace), "sampling",
G_TYPE_STRING, gst_jpeg2000_sampling_to_string (source_sampling), NULL);
if (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;
gst_caps_unref (src_caps);
goto beach;
}
gst_caps_unref (src_caps);
}
/*************************************************/
/* look for EOC to mark frame end */
/* look for EOC end of codestream marker */
eoc_offset = gst_byte_reader_masked_scan_uint32 (&reader, 0x0000ffff,
0xFFD9, 0, gst_byte_reader_get_remaining (&reader));
if (eoc_offset != -1) {
/* add 4 for eoc marker and eoc marker size */
guint eoc_frame_size = gst_byte_reader_get_pos (&reader) + eoc_offset + 4;
GST_DEBUG_OBJECT (jpeg2000parse,
"Found EOC at offset = %d, frame size = %d", eoc_offset,
eoc_frame_size);
/* bail out if not enough data for frame */
if (gst_byte_reader_get_size (&reader) < eoc_frame_size)
goto beach;
if (frame_size && frame_size != eoc_frame_size) {
GST_WARNING_OBJECT (jpeg2000parse,
"Frame size %d from contiguous code size does not equal frame size %d signalled by eoc",
frame_size, eoc_frame_size);
}
frame_size = eoc_frame_size;
}
/* clean up and finish frame */
if (current_caps)
gst_caps_unref (current_caps);
gst_buffer_unmap (frame->buffer, &map);
return gst_base_parse_finish_frame (parse, frame, frame_size);
beach:
if (current_caps)
gst_caps_unref (current_caps);
gst_buffer_unmap (frame->buffer, &map);
return ret;
}
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