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gstreamer/ext/jpeg/gstjpegdec.c
Mark Nauwelaerts 173741c10c ext/jpeg/gstjpegdec.c: Align documentation with reality. 
Original commit message from CVS:
* ext/jpeg/gstjpegdec.c:
Align documentation with reality.
2008-07-14 16:28:25 +00:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-jpegdec
*
* Decodes jpeg images.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstjpegdec.h"
#include <gst/video/video.h>
#include "gst/gst-i18n-plugin.h"
#include <jerror.h>
static const GstElementDetails gst_jpeg_dec_details =
GST_ELEMENT_DETAILS ("JPEG image decoder",
"Codec/Decoder/Image",
"Decode images from JPEG format",
"Wim Taymans <wim@fluendo.com>");
#define MIN_WIDTH 16
#define MAX_WIDTH 4096
#define MIN_HEIGHT 8
#define MAX_HEIGHT 4096
#define DEFAULT_IDCT_METHOD JDCT_FASTEST
enum
{
PROP_0,
PROP_IDCT_METHOD
};
#define GST_TYPE_IDCT_METHOD (gst_idct_method_get_type())
static GType
gst_idct_method_get_type (void)
{
static GType idct_method_type = 0;
static const GEnumValue idct_method[] = {
{JDCT_ISLOW, "Slow but accurate integer algorithm", "islow"},
{JDCT_IFAST, "Faster, less accurate integer method", "ifast"},
{JDCT_FLOAT, "Floating-point: accurate, fast on fast HW", "float"},
{0, NULL, NULL},
};
if (!idct_method_type) {
idct_method_type = g_enum_register_static ("GstIDCTMethod", idct_method);
}
return idct_method_type;
}
static GstStaticPadTemplate gst_jpeg_dec_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
);
static GstStaticPadTemplate gst_jpeg_dec_sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/jpeg, "
"width = (int) [ " G_STRINGIFY (MIN_WIDTH) ", " G_STRINGIFY (MAX_WIDTH)
" ], " "height = (int) [ " G_STRINGIFY (MIN_HEIGHT) ", "
G_STRINGIFY (MAX_HEIGHT) " ], " "framerate = (fraction) [ 0/1, MAX ]")
);
GST_DEBUG_CATEGORY_STATIC (jpeg_dec_debug);
#define GST_CAT_DEFAULT jpeg_dec_debug
/* These macros are adapted from videotestsrc.c
* and/or gst-plugins/gst/games/gstvideoimage.c */
#define I420_Y_ROWSTRIDE(width) (GST_ROUND_UP_4(width))
#define I420_U_ROWSTRIDE(width) (GST_ROUND_UP_8(width)/2)
#define I420_V_ROWSTRIDE(width) ((GST_ROUND_UP_8(I420_Y_ROWSTRIDE(width)))/2)
#define I420_Y_OFFSET(w,h) (0)
#define I420_U_OFFSET(w,h) (I420_Y_OFFSET(w,h)+(I420_Y_ROWSTRIDE(w)*GST_ROUND_UP_2(h)))
#define I420_V_OFFSET(w,h) (I420_U_OFFSET(w,h)+(I420_U_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
#define I420_SIZE(w,h) (I420_V_OFFSET(w,h)+(I420_V_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
static GstElementClass *parent_class; /* NULL */
static void gst_jpeg_dec_base_init (gpointer g_class);
static void gst_jpeg_dec_class_init (GstJpegDecClass * klass);
static void gst_jpeg_dec_init (GstJpegDec * jpegdec);
static void gst_jpeg_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_jpeg_dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_jpeg_dec_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_jpeg_dec_setcaps (GstPad * pad, GstCaps * caps);
static gboolean gst_jpeg_dec_sink_event (GstPad * pad, GstEvent * event);
static GstStateChangeReturn gst_jpeg_dec_change_state (GstElement * element,
GstStateChange transition);
GType
gst_jpeg_dec_get_type (void)
{
static GType type = 0;
if (!type) {
static const GTypeInfo jpeg_dec_info = {
sizeof (GstJpegDecClass),
(GBaseInitFunc) gst_jpeg_dec_base_init,
NULL,
(GClassInitFunc) gst_jpeg_dec_class_init,
NULL,
NULL,
sizeof (GstJpegDec),
0,
(GInstanceInitFunc) gst_jpeg_dec_init,
};
type = g_type_register_static (GST_TYPE_ELEMENT, "GstJpegDec",
&jpeg_dec_info, 0);
}
return type;
}
static void
gst_jpeg_dec_finalize (GObject * object)
{
GstJpegDec *dec = GST_JPEG_DEC (object);
jpeg_destroy_decompress (&dec->cinfo);
if (dec->tempbuf)
gst_buffer_unref (dec->tempbuf);
if (dec->segment)
gst_segment_free (dec->segment);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_jpeg_dec_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_jpeg_dec_src_pad_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_jpeg_dec_sink_pad_template));
gst_element_class_set_details (element_class, &gst_jpeg_dec_details);
}
static void
gst_jpeg_dec_class_init (GstJpegDecClass * klass)
{
GstElementClass *gstelement_class;
GObjectClass *gobject_class;
gstelement_class = (GstElementClass *) klass;
gobject_class = (GObjectClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gst_jpeg_dec_finalize;
gobject_class->set_property = gst_jpeg_dec_set_property;
gobject_class->get_property = gst_jpeg_dec_get_property;
g_object_class_install_property (gobject_class, PROP_IDCT_METHOD,
g_param_spec_enum ("idct-method", "IDCT Method",
"The IDCT algorithm to use", GST_TYPE_IDCT_METHOD,
DEFAULT_IDCT_METHOD, G_PARAM_READWRITE));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_jpeg_dec_change_state);
GST_DEBUG_CATEGORY_INIT (jpeg_dec_debug, "jpegdec", 0, "JPEG decoder");
}
static boolean
gst_jpeg_dec_fill_input_buffer (j_decompress_ptr cinfo)
{
/*
struct GstJpegDecSourceMgr *src_mgr;
GstJpegDec *dec;
src_mgr = (struct GstJpegDecSourceMgr*) &cinfo->src;
dec = GST_JPEG_DEC (src_mgr->dec);
*/
GST_DEBUG ("fill_input_buffer");
/*
g_return_val_if_fail (dec != NULL, TRUE);
src_mgr->pub.next_input_byte = GST_BUFFER_DATA (dec->tempbuf);
src_mgr->pub.bytes_in_buffer = GST_BUFFER_SIZE (dec->tempbuf);
*/
return TRUE;
}
static void
gst_jpeg_dec_init_source (j_decompress_ptr cinfo)
{
GST_DEBUG ("init_source");
}
static void
gst_jpeg_dec_skip_input_data (j_decompress_ptr cinfo, glong num_bytes)
{
GST_DEBUG ("skip_input_data: %ld bytes", num_bytes);
if (num_bytes > 0 && cinfo->src->bytes_in_buffer >= num_bytes) {
cinfo->src->next_input_byte += (size_t) num_bytes;
cinfo->src->bytes_in_buffer -= (size_t) num_bytes;
}
}
static boolean
gst_jpeg_dec_resync_to_restart (j_decompress_ptr cinfo, gint desired)
{
GST_DEBUG ("resync_to_start");
return TRUE;
}
static void
gst_jpeg_dec_term_source (j_decompress_ptr cinfo)
{
GST_DEBUG ("term_source");
return;
}
METHODDEF (void)
gst_jpeg_dec_my_output_message (j_common_ptr cinfo)
{
return; /* do nothing */
}
METHODDEF (void)
gst_jpeg_dec_my_emit_message (j_common_ptr cinfo, int msg_level)
{
/* GST_DEBUG ("emit_message: msg_level = %d", msg_level); */
return;
}
METHODDEF (void)
gst_jpeg_dec_my_error_exit (j_common_ptr cinfo)
{
struct GstJpegDecErrorMgr *err_mgr = (struct GstJpegDecErrorMgr *) cinfo->err;
(*cinfo->err->output_message) (cinfo);
longjmp (err_mgr->setjmp_buffer, 1);
}
static void
gst_jpeg_dec_init (GstJpegDec * dec)
{
GST_DEBUG ("initializing");
/* create the sink and src pads */
dec->sinkpad =
gst_pad_new_from_static_template (&gst_jpeg_dec_sink_pad_template,
"sink");
gst_element_add_pad (GST_ELEMENT (dec), dec->sinkpad);
gst_pad_set_setcaps_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_jpeg_dec_setcaps));
gst_pad_set_chain_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_jpeg_dec_chain));
gst_pad_set_event_function (dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_jpeg_dec_sink_event));
dec->srcpad =
gst_pad_new_from_static_template (&gst_jpeg_dec_src_pad_template, "src");
gst_pad_use_fixed_caps (dec->srcpad);
gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
dec->segment = gst_segment_new ();
/* setup jpeglib */
memset (&dec->cinfo, 0, sizeof (dec->cinfo));
memset (&dec->jerr, 0, sizeof (dec->jerr));
dec->cinfo.err = jpeg_std_error (&dec->jerr.pub);
dec->jerr.pub.output_message = gst_jpeg_dec_my_output_message;
dec->jerr.pub.emit_message = gst_jpeg_dec_my_emit_message;
dec->jerr.pub.error_exit = gst_jpeg_dec_my_error_exit;
jpeg_create_decompress (&dec->cinfo);
dec->cinfo.src = (struct jpeg_source_mgr *) &dec->jsrc;
dec->cinfo.src->init_source = gst_jpeg_dec_init_source;
dec->cinfo.src->fill_input_buffer = gst_jpeg_dec_fill_input_buffer;
dec->cinfo.src->skip_input_data = gst_jpeg_dec_skip_input_data;
dec->cinfo.src->resync_to_restart = gst_jpeg_dec_resync_to_restart;
dec->cinfo.src->term_source = gst_jpeg_dec_term_source;
dec->jsrc.dec = dec;
/* init properties */
dec->idct_method = DEFAULT_IDCT_METHOD;
}
static inline gboolean
is_jpeg_start_marker (const guint8 * data)
{
return (data[0] == 0xff && data[1] == 0xd8);
}
static inline gboolean
is_jpeg_end_marker (const guint8 * data)
{
return (data[0] == 0xff && data[1] == 0xd9);
}
static gboolean
gst_jpeg_dec_find_jpeg_header (GstJpegDec * dec)
{
const guint8 *data;
guint size;
data = GST_BUFFER_DATA (dec->tempbuf);
size = GST_BUFFER_SIZE (dec->tempbuf);
g_return_val_if_fail (size >= 2, FALSE);
while (!is_jpeg_start_marker (data) || data[2] != 0xff) {
const guint8 *marker;
GstBuffer *tmp;
guint off;
marker = memchr (data + 1, 0xff, size - 1 - 2);
if (marker == NULL) {
off = size - 1; /* keep last byte */
} else {
off = marker - data;
}
tmp = gst_buffer_create_sub (dec->tempbuf, off, size - off);
gst_buffer_unref (dec->tempbuf);
dec->tempbuf = tmp;
data = GST_BUFFER_DATA (dec->tempbuf);
size = GST_BUFFER_SIZE (dec->tempbuf);
if (size < 2)
return FALSE; /* wait for more data */
}
return TRUE; /* got header */
}
static gboolean
gst_jpeg_dec_ensure_header (GstJpegDec * dec)
{
g_return_val_if_fail (dec->tempbuf != NULL, FALSE);
check_header:
/* we need at least a start marker (0xff 0xd8)
* and an end marker (0xff 0xd9) */
if (GST_BUFFER_SIZE (dec->tempbuf) <= 4) {
GST_DEBUG ("Not enough data");
return FALSE; /* we need more data */
}
if (!is_jpeg_start_marker (GST_BUFFER_DATA (dec->tempbuf))) {
GST_DEBUG ("Not a JPEG header, resyncing to header...");
if (!gst_jpeg_dec_find_jpeg_header (dec)) {
GST_DEBUG ("No JPEG header in current buffer");
return FALSE; /* we need more data */
}
GST_DEBUG ("Found JPEG header");
goto check_header; /* buffer might have changed */
}
return TRUE;
}
#if 0
static gboolean
gst_jpeg_dec_have_end_marker (GstJpegDec * dec)
{
guint8 *data = GST_BUFFER_DATA (dec->tempbuf);
guint size = GST_BUFFER_SIZE (dec->tempbuf);
return (size > 2 && data && is_jpeg_end_marker (data + size - 2));
}
#endif
static inline gboolean
gst_jpeg_dec_parse_tag_has_entropy_segment (guint8 tag)
{
if (tag == 0xda || (tag >= 0xd0 && tag <= 0xd7))
return TRUE;
return FALSE;
}
/* returns image length in bytes if parsed
* successfully, otherwise 0 */
static guint
gst_jpeg_dec_parse_image_data (GstJpegDec * dec)
{
guint8 *start, *data, *end;
guint size;
size = GST_BUFFER_SIZE (dec->tempbuf);
start = GST_BUFFER_DATA (dec->tempbuf);
end = start + size;
data = start;
g_return_val_if_fail (is_jpeg_start_marker (data), 0);
GST_DEBUG ("Parsing jpeg image data (%u bytes)", size);
/* skip start marker */
data += 2;
while (1) {
guint frame_len;
/* enough bytes left for EOI marker? (we need 0xff 0xNN, thus end-1) */
if (data >= end - 1) {
GST_DEBUG ("at end of input and no EOI marker found, need more data");
return 0;
}
if (is_jpeg_end_marker (data)) {
GST_DEBUG ("0x%08x: end marker", data - start);
goto found_eoi;
}
/* do we need to resync? */
if (*data != 0xff) {
GST_DEBUG ("Lost sync at 0x%08x, resyncing", data - start);
/* at the very least we expect 0xff 0xNN, thus end-1 */
while (*data != 0xff && data < end - 1)
++data;
if (is_jpeg_end_marker (data)) {
GST_DEBUG ("resynced to end marker");
goto found_eoi;
}
/* we need 0xFF 0xNN 0xLL 0xLL */
if (data >= end - 1 - 2) {
GST_DEBUG ("at end of input, without new sync, need more data");
return 0;
}
/* check if we will still be in sync if we interpret
* this as a sync point and skip this frame */
frame_len = GST_READ_UINT16_BE (data + 2);
GST_DEBUG ("possible sync at 0x%08x, frame_len=%u", data - start,
frame_len);
if (data + 2 + frame_len >= end - 1 || data[2 + frame_len] != 0xff) {
/* ignore and continue resyncing until we hit the end
* of our data or find a sync point that looks okay */
++data;
continue;
}
GST_DEBUG ("found sync at %p", data - size);
}
while (*data == 0xff)
++data;
if (data + 2 >= end)
return 0;
if (*data >= 0xd0 && *data <= 0xd7)
frame_len = 0;
else
frame_len = GST_READ_UINT16_BE (data + 1);
GST_DEBUG ("0x%08x: tag %02x, frame_len=%u", data - start - 1, *data,
frame_len);
/* the frame length includes the 2 bytes for the length; here we want at
* least 2 more bytes at the end for an end marker, thus end-2 */
if (data + 1 + frame_len >= end - 2) {
/* theoretically we could have lost sync and not really need more
* data, but that's just tough luck and a broken image then */
GST_DEBUG ("at end of input and no EOI marker found, need more data");
return 0;
}
if (gst_jpeg_dec_parse_tag_has_entropy_segment (*data)) {
guint8 *d2 = data + 1 + frame_len;
guint eseglen = 0;
GST_DEBUG ("0x%08x: finding entropy segment length", data - start - 1);
while (1) {
if (d2[eseglen] == 0xff && d2[eseglen + 1] != 0x00)
break;
if (d2 + eseglen >= end - 1)
return 0; /* need more data */
++eseglen;
}
frame_len += eseglen;
GST_DEBUG ("entropy segment length=%u => frame_len=%u", eseglen,
frame_len);
}
data += 1 + frame_len;
}
found_eoi:
/* data is assumed to point to the 0xff sync point of the
* EOI marker (so there is one more byte after that) */
g_assert (is_jpeg_end_marker (data));
return ((data + 1) - start + 1);
}
/* shamelessly ripped from jpegutils.c in mjpegtools */
static void
add_huff_table (j_decompress_ptr dinfo,
JHUFF_TBL ** htblptr, const UINT8 * bits, const UINT8 * val)
/* Define a Huffman table */
{
int nsymbols, len;
if (*htblptr == NULL)
*htblptr = jpeg_alloc_huff_table ((j_common_ptr) dinfo);
/* Copy the number-of-symbols-of-each-code-length counts */
memcpy ((*htblptr)->bits, bits, sizeof ((*htblptr)->bits));
/* Validate the counts. We do this here mainly so we can copy the right
* number of symbols from the val[] array, without risking marching off
* the end of memory. jchuff.c will do a more thorough test later.
*/
nsymbols = 0;
for (len = 1; len <= 16; len++)
nsymbols += bits[len];
if (nsymbols < 1 || nsymbols > 256)
g_error ("jpegutils.c: add_huff_table failed badly. ");
memcpy ((*htblptr)->huffval, val, nsymbols * sizeof (UINT8));
}
static void
std_huff_tables (j_decompress_ptr dinfo)
/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
/* IMPORTANT: these are only valid for 8-bit data precision! */
{
static const UINT8 bits_dc_luminance[17] =
{ /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
static const UINT8 val_dc_luminance[] =
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
static const UINT8 bits_dc_chrominance[17] =
{ /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
static const UINT8 val_dc_chrominance[] =
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
static const UINT8 bits_ac_luminance[17] =
{ /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
static const UINT8 val_ac_luminance[] =
{ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
0xf9, 0xfa
};
static const UINT8 bits_ac_chrominance[17] =
{ /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
static const UINT8 val_ac_chrominance[] =
{ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
0xf9, 0xfa
};
add_huff_table (dinfo, &dinfo->dc_huff_tbl_ptrs[0],
bits_dc_luminance, val_dc_luminance);
add_huff_table (dinfo, &dinfo->ac_huff_tbl_ptrs[0],
bits_ac_luminance, val_ac_luminance);
add_huff_table (dinfo, &dinfo->dc_huff_tbl_ptrs[1],
bits_dc_chrominance, val_dc_chrominance);
add_huff_table (dinfo, &dinfo->ac_huff_tbl_ptrs[1],
bits_ac_chrominance, val_ac_chrominance);
}
static void
guarantee_huff_tables (j_decompress_ptr dinfo)
{
if ((dinfo->dc_huff_tbl_ptrs[0] == NULL) &&
(dinfo->dc_huff_tbl_ptrs[1] == NULL) &&
(dinfo->ac_huff_tbl_ptrs[0] == NULL) &&
(dinfo->ac_huff_tbl_ptrs[1] == NULL)) {
GST_DEBUG ("Generating standard Huffman tables for this frame.");
std_huff_tables (dinfo);
}
}
static gboolean
gst_jpeg_dec_setcaps (GstPad * pad, GstCaps * caps)
{
GstStructure *s;
GstJpegDec *dec;
const GValue *framerate;
dec = GST_JPEG_DEC (GST_OBJECT_PARENT (pad));
s = gst_caps_get_structure (caps, 0);
if ((framerate = gst_structure_get_value (s, "framerate")) != NULL) {
dec->framerate_numerator = gst_value_get_fraction_numerator (framerate);
dec->framerate_denominator = gst_value_get_fraction_denominator (framerate);
dec->packetized = TRUE;
GST_DEBUG ("got framerate of %d/%d fps => packetized mode",
dec->framerate_numerator, dec->framerate_denominator);
}
/* do not extract width/height here. we do that in the chain
* function on a per-frame basis (including the line[] array
* setup) */
/* But we can take the framerate values and set them on the src pad */
return TRUE;
}
/* yuk */
static void
hresamplecpy1 (guint8 * dest, const guint8 * src, guint len)
{
gint i;
for (i = 0; i < len; ++i) {
/* equivalent to: dest[i] = src[i << 1] */
*dest = *src;
++dest;
++src;
++src;
}
}
static void
gst_jpeg_dec_decode_indirect (GstJpegDec * dec, guchar * base[3],
guchar * last[3], guint width, guint height, gint r_v, gint r_h)
{
guchar y[16][MAX_WIDTH];
guchar u[16][MAX_WIDTH];
guchar v[16][MAX_WIDTH];
guchar *y_rows[16] = { y[0], y[1], y[2], y[3], y[4], y[5], y[6], y[7],
y[8], y[9], y[10], y[11], y[12], y[13], y[14], y[15]
};
guchar *u_rows[16] = { u[0], u[1], u[2], u[3], u[4], u[5], u[6], u[7],
u[8], u[9], u[10], u[11], u[12], u[13], u[14], u[15]
};
guchar *v_rows[16] = { v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7],
v[8], v[9], v[10], v[11], v[12], v[13], v[14], v[15]
};
guchar **scanarray[3] = { y_rows, u_rows, v_rows };
gint i, j, k;
GST_DEBUG_OBJECT (dec,
"unadvantageous width or r_h, taking slow route involving memcpy");
for (i = 0; i < height; i += r_v * DCTSIZE) {
jpeg_read_raw_data (&dec->cinfo, scanarray, r_v * DCTSIZE);
for (j = 0, k = 0; j < (r_v * DCTSIZE); j += r_v, k++) {
memcpy (base[0], y_rows[j], I420_Y_ROWSTRIDE (width));
if (base[0] < last[0])
base[0] += I420_Y_ROWSTRIDE (width);
if (r_v == 2) {
memcpy (base[0], y_rows[j + 1], I420_Y_ROWSTRIDE (width));
if (base[0] < last[0])
base[0] += I420_Y_ROWSTRIDE (width);
}
if (G_LIKELY (r_h == 2)) {
memcpy (base[1], u_rows[k], I420_U_ROWSTRIDE (width));
memcpy (base[2], v_rows[k], I420_V_ROWSTRIDE (width));
} else if (G_UNLIKELY (r_h == 1)) {
hresamplecpy1 (base[1], u_rows[k], I420_U_ROWSTRIDE (width));
hresamplecpy1 (base[2], v_rows[k], I420_V_ROWSTRIDE (width));
} else {
/* FIXME: implement (at least we avoid crashing by doing nothing) */
}
if (r_v == 2 || (k & 1) != 0) {
if (base[1] < last[1] && base[2] < last[2]) {
base[1] += I420_U_ROWSTRIDE (width);
base[2] += I420_V_ROWSTRIDE (width);
}
}
}
}
}
static void
gst_jpeg_dec_decode_direct (GstJpegDec * dec, guchar * base[3],
guchar * last[3], guint width, guint height, gint r_v)
{
guchar **line[3]; /* the jpeg line buffer */
guchar *y[4 * DCTSIZE]; /* alloc enough for the lines */
guchar *u[4 * DCTSIZE];
guchar *v[4 * DCTSIZE];
gint i, j, k;
line[0] = y;
line[1] = u;
line[2] = v;
/* let jpeglib decode directly into our final buffer */
GST_DEBUG_OBJECT (dec, "decoding directly into output buffer");
for (i = 0; i < height; i += r_v * DCTSIZE) {
for (j = 0, k = 0; j < (r_v * DCTSIZE); j += r_v, k++) {
line[0][j] = base[0];
if (base[0] < last[0])
base[0] += I420_Y_ROWSTRIDE (width);
if (r_v == 2) {
line[0][j + 1] = base[0];
if (base[0] < last[0])
base[0] += I420_Y_ROWSTRIDE (width);
}
line[1][k] = base[1];
line[2][k] = base[2];
if (r_v == 2 || (k & 1) != 0) {
if (base[1] < last[1] && base[2] < last[2]) {
base[1] += I420_U_ROWSTRIDE (width);
base[2] += I420_V_ROWSTRIDE (width);
}
}
}
jpeg_read_raw_data (&dec->cinfo, line, r_v * DCTSIZE);
}
}
static GstFlowReturn
gst_jpeg_dec_chain (GstPad * pad, GstBuffer * buf)
{
GstFlowReturn ret;
GstJpegDec *dec;
GstBuffer *outbuf;
gulong size;
guchar *data, *outdata;
guchar *base[3], *last[3];
guint img_len, outsize;
gint width, height;
gint r_h, r_v;
gint i;
guint code;
GstClockTime timestamp, duration;
dec = GST_JPEG_DEC (gst_pad_get_parent (pad));
timestamp = GST_BUFFER_TIMESTAMP (buf);
duration = GST_BUFFER_DURATION (buf);
if (GST_CLOCK_TIME_IS_VALID (timestamp))
dec->next_ts = timestamp;
if (dec->tempbuf) {
dec->tempbuf = gst_buffer_join (dec->tempbuf, buf);
} else {
dec->tempbuf = buf;
}
buf = NULL;
if (!gst_jpeg_dec_ensure_header (dec))
goto need_more_data;
/* If we know that each input buffer contains data
* for a whole jpeg image (e.g. MJPEG streams), just
* do some sanity checking instead of parsing all of
* the jpeg data */
if (dec->packetized) {
img_len = GST_BUFFER_SIZE (dec->tempbuf);
} else {
/* Parse jpeg image to handle jpeg input that
* is not aligned to buffer boundaries */
img_len = gst_jpeg_dec_parse_image_data (dec);
if (img_len == 0)
goto need_more_data;
}
data = (guchar *) GST_BUFFER_DATA (dec->tempbuf);
size = img_len;
GST_LOG_OBJECT (dec, "image size = %u", img_len);
dec->jsrc.pub.next_input_byte = data;
dec->jsrc.pub.bytes_in_buffer = size;
if (setjmp (dec->jerr.setjmp_buffer)) {
code = dec->jerr.pub.msg_code;
if (code == JERR_INPUT_EOF) {
GST_DEBUG ("jpeg input EOF error, we probably need more data");
goto need_more_data;
}
goto decode_error;
}
GST_LOG_OBJECT (dec, "reading header %02x %02x %02x %02x", data[0], data[1],
data[2], data[3]);
/* read header */
jpeg_read_header (&dec->cinfo, TRUE);
r_h = dec->cinfo.cur_comp_info[0]->h_samp_factor;
r_v = dec->cinfo.cur_comp_info[0]->v_samp_factor;
GST_DEBUG ("r_h = %d, r_v = %d", r_h, r_v);
GST_DEBUG ("num_components=%d, comps_in_scan=%d",
dec->cinfo.num_components, dec->cinfo.comps_in_scan);
for (i = 0; i < dec->cinfo.comps_in_scan; ++i) {
GST_DEBUG ("[%d] h_samp_factor=%d, v_samp_factor=%d", i,
dec->cinfo.cur_comp_info[i]->h_samp_factor,
dec->cinfo.cur_comp_info[i]->v_samp_factor);
}
/* prepare for raw output */
dec->cinfo.do_fancy_upsampling = FALSE;
dec->cinfo.do_block_smoothing = FALSE;
dec->cinfo.out_color_space = JCS_YCbCr;
dec->cinfo.dct_method = dec->idct_method;
dec->cinfo.raw_data_out = TRUE;
GST_LOG_OBJECT (dec, "starting decompress");
guarantee_huff_tables (&dec->cinfo);
jpeg_start_decompress (&dec->cinfo);
width = dec->cinfo.output_width;
height = dec->cinfo.output_height;
if (width < MIN_WIDTH || width > MAX_WIDTH ||
height < MIN_HEIGHT || height > MAX_HEIGHT)
goto wrong_size;
if (width != dec->caps_width || height != dec->caps_height ||
dec->framerate_numerator != dec->caps_framerate_numerator ||
dec->framerate_denominator != dec->caps_framerate_denominator) {
GstCaps *caps;
/* framerate == 0/1 is a still frame */
if (dec->framerate_denominator == 0) {
dec->framerate_numerator = 0;
dec->framerate_denominator = 1;
}
caps = gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'),
"width", G_TYPE_INT, width,
"height", G_TYPE_INT, height,
"framerate", GST_TYPE_FRACTION, dec->framerate_numerator,
dec->framerate_denominator, NULL);
GST_DEBUG_OBJECT (dec, "setting caps %" GST_PTR_FORMAT, caps);
GST_DEBUG_OBJECT (dec, "max_v_samp_factor=%d",
dec->cinfo.max_v_samp_factor);
gst_pad_set_caps (dec->srcpad, caps);
gst_caps_unref (caps);
dec->caps_width = width;
dec->caps_height = height;
dec->caps_framerate_numerator = dec->framerate_numerator;
dec->caps_framerate_denominator = dec->framerate_denominator;
dec->outsize = I420_SIZE (width, height);
}
ret = gst_pad_alloc_buffer_and_set_caps (dec->srcpad, GST_BUFFER_OFFSET_NONE,
dec->outsize, GST_PAD_CAPS (dec->srcpad), &outbuf);
if (ret != GST_FLOW_OK)
goto alloc_failed;
outdata = GST_BUFFER_DATA (outbuf);
outsize = GST_BUFFER_SIZE (outbuf);
GST_LOG_OBJECT (dec, "width %d, height %d, buffer size %d, required size %d",
width, height, outsize, dec->outsize);
GST_BUFFER_TIMESTAMP (outbuf) = dec->next_ts;
if (dec->packetized && GST_CLOCK_TIME_IS_VALID (dec->next_ts)) {
if (GST_CLOCK_TIME_IS_VALID (duration)) {
/* use duration from incoming buffer for outgoing buffer */
dec->next_ts += duration;
} else if (dec->framerate_numerator != 0) {
duration = gst_util_uint64_scale (GST_SECOND,
dec->framerate_denominator, dec->framerate_numerator);
dec->next_ts += duration;
} else {
duration = GST_CLOCK_TIME_NONE;
dec->next_ts = GST_CLOCK_TIME_NONE;
}
} else {
duration = GST_CLOCK_TIME_NONE;
dec->next_ts = GST_CLOCK_TIME_NONE;
}
GST_BUFFER_DURATION (outbuf) = duration;
/* mind the swap, jpeglib outputs blue chroma first */
base[0] = outdata + I420_Y_OFFSET (width, height);
base[1] = outdata + I420_U_OFFSET (width, height);
base[2] = outdata + I420_V_OFFSET (width, height);
/* make sure we don't make jpeglib write beyond our buffer,
* which might happen if (height % (r_v*DCTSIZE)) != 0 */
last[0] = base[0] + (I420_Y_ROWSTRIDE (width) * (height - 1));
last[1] =
base[1] + (I420_U_ROWSTRIDE (width) * ((GST_ROUND_UP_2 (height) / 2) -
1));
last[2] =
base[2] + (I420_V_ROWSTRIDE (width) * ((GST_ROUND_UP_2 (height) / 2) -
1));
GST_LOG_OBJECT (dec, "decompressing %u", dec->cinfo.rec_outbuf_height);
GST_LOG_OBJECT (dec, "max_h_samp_factor=%u", dec->cinfo.max_h_samp_factor);
/* For some widths jpeglib requires more horizontal padding than I420
* provides. In those cases we need to decode into separate buffers and then
* copy over the data into our final picture buffer, otherwise jpeglib might
* write over the end of a line into the beginning of the next line,
* resulting in blocky artifacts on the left side of the picture. */
if (r_h != 2 || width % (dec->cinfo.max_h_samp_factor * DCTSIZE) != 0) {
gst_jpeg_dec_decode_indirect (dec, base, last, width, height, r_v, r_h);
} else {
gst_jpeg_dec_decode_direct (dec, base, last, width, height, r_v);
}
GST_LOG_OBJECT (dec, "decompressing finished");
jpeg_finish_decompress (&dec->cinfo);
/* Clipping */
if (dec->segment->format == GST_FORMAT_TIME) {
gint64 start, stop, clip_start, clip_stop;
GST_LOG_OBJECT (dec, "Attempting clipping");
start = GST_BUFFER_TIMESTAMP (outbuf);
if (GST_BUFFER_DURATION (outbuf) == GST_CLOCK_TIME_NONE)
stop = start;
else
stop = start + GST_BUFFER_DURATION (outbuf);
if (gst_segment_clip (dec->segment, GST_FORMAT_TIME,
start, stop, &clip_start, &clip_stop)) {
GST_LOG_OBJECT (dec, "Clipping start to %" GST_TIME_FORMAT,
GST_TIME_ARGS (clip_start));
GST_BUFFER_TIMESTAMP (outbuf) = clip_start;
if (GST_BUFFER_DURATION (outbuf) != GST_CLOCK_TIME_NONE) {
GST_LOG_OBJECT (dec, "Clipping duration to %" GST_TIME_FORMAT,
GST_TIME_ARGS (clip_stop - clip_start));
GST_BUFFER_DURATION (outbuf) = clip_stop - clip_start;
}
} else
goto drop_buffer;
}
GST_LOG_OBJECT (dec, "pushing buffer (ts=%" GST_TIME_FORMAT ", dur=%"
GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)));
ret = gst_pad_push (dec->srcpad, outbuf);
done:
if (GST_BUFFER_SIZE (dec->tempbuf) == img_len) {
gst_buffer_unref (dec->tempbuf);
dec->tempbuf = NULL;
} else {
GstBuffer *buf = gst_buffer_create_sub (dec->tempbuf, img_len,
GST_BUFFER_SIZE (dec->tempbuf) - img_len);
gst_buffer_unref (dec->tempbuf);
dec->tempbuf = buf;
}
exit:
gst_object_unref (dec);
return ret;
/* special cases */
need_more_data:
{
GST_LOG_OBJECT (dec, "we need more data");
ret = GST_FLOW_OK;
goto exit;
}
/* ERRORS */
wrong_size:
{
GST_ELEMENT_ERROR (dec, STREAM, DECODE,
("Picture is too small or too big (%ux%u)", width, height),
("Picture is too small or too big (%ux%u)", width, height));
ret = GST_FLOW_ERROR;
goto done;
}
decode_error:
{
GST_ELEMENT_ERROR (dec, STREAM, DECODE,
(_("Failed to decode JPEG image")),
("Error #%u: %s", code, dec->jerr.pub.jpeg_message_table[code]));
ret = GST_FLOW_ERROR;
goto done;
}
alloc_failed:
{
const gchar *reason;
reason = gst_flow_get_name (ret);
GST_DEBUG_OBJECT (dec, "failed to alloc buffer, reason %s", reason);
/* Reset for next time */
jpeg_abort_decompress (&dec->cinfo);
if (GST_FLOW_IS_FATAL (ret)) {
GST_ELEMENT_ERROR (dec, STREAM, DECODE,
("Buffer allocation failed, reason: %s", reason),
("Buffer allocation failed, reason: %s", reason));
}
goto exit;
}
drop_buffer:
{
GST_WARNING_OBJECT (dec, "Outgoing buffer is outside configured segment");
gst_buffer_unref (outbuf);
ret = GST_FLOW_OK;
goto exit;
}
}
static gboolean
gst_jpeg_dec_sink_event (GstPad * pad, GstEvent * event)
{
gboolean ret = TRUE;
GstJpegDec *dec = GST_JPEG_DEC (GST_OBJECT_PARENT (pad));
GST_DEBUG_OBJECT (dec, "event : %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
GST_DEBUG_OBJECT (dec, "Aborting decompress");
jpeg_abort_decompress (&dec->cinfo);
break;
case GST_EVENT_NEWSEGMENT:{
gboolean update;
gdouble rate, applied_rate;
GstFormat format;
gint64 start, stop, position;
gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
&format, &start, &stop, &position);
GST_DEBUG_OBJECT (dec, "Got NEWSEGMENT [%" GST_TIME_FORMAT
" - %" GST_TIME_FORMAT " / %" GST_TIME_FORMAT "]",
GST_TIME_ARGS (start), GST_TIME_ARGS (stop),
GST_TIME_ARGS (position));
gst_segment_set_newsegment_full (dec->segment, update, rate,
applied_rate, format, start, stop, position);
break;
}
default:
break;
}
ret = gst_pad_push_event (dec->srcpad, event);
return ret;
}
static void
gst_jpeg_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstJpegDec *dec;
dec = GST_JPEG_DEC (object);
switch (prop_id) {
case PROP_IDCT_METHOD:
dec->idct_method = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_jpeg_dec_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstJpegDec *dec;
dec = GST_JPEG_DEC (object);
switch (prop_id) {
case PROP_IDCT_METHOD:
g_value_set_enum (value, dec->idct_method);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_jpeg_dec_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstJpegDec *dec;
dec = GST_JPEG_DEC (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
dec->framerate_numerator = 0;
dec->framerate_denominator = 1;
dec->caps_framerate_numerator = dec->caps_framerate_denominator = 0;
dec->caps_width = -1;
dec->caps_height = -1;
dec->packetized = FALSE;
dec->next_ts = 0;
gst_segment_init (dec->segment, GST_FORMAT_UNDEFINED);
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret != GST_STATE_CHANGE_SUCCESS)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (dec->tempbuf) {
gst_buffer_unref (dec->tempbuf);
dec->tempbuf = NULL;
}
break;
default:
break;
}
return ret;
}
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