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gstreamer/ext/jpeg/gstjpegdec.c
Mark Nauwelaerts 58fbcf01e5 jpegdec: optimize buffer handling when parsing 
Use an adapter to collect incoming data, and use adapter API to scan and peek.

Fixes #583047.
2010-06-14 15:17:16 +02:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2009> Tim-Philipp Müller <tim centricular net>
*
* 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.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v v4l2src ! jpegddec ! ffmpegcolorspace ! xvimagesink
* ]| The above pipeline reads a motion JPEG stream from a v4l2 camera
* and renders it to the screen.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstjpegdec.h"
#include "gstjpeg.h"
#include <gst/video/video.h>
#include "gst/gst-i18n-plugin.h"
#include <jerror.h>
#define MIN_WIDTH 1
#define MAX_WIDTH 65535
#define MIN_HEIGHT 1
#define MAX_HEIGHT 65535
#define CINFO_GET_JPEGDEC(cinfo_ptr) \
(((struct GstJpegDecSourceMgr*)((cinfo_ptr)->src))->dec)
#define JPEG_DEFAULT_IDCT_METHOD JDCT_FASTEST
enum
{
PROP_0,
PROP_IDCT_METHOD
};
/* *INDENT-OFF* */
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") "; "
GST_VIDEO_CAPS_RGB "; " GST_VIDEO_CAPS_BGR "; "
GST_VIDEO_CAPS_RGBx "; " GST_VIDEO_CAPS_xRGB "; "
GST_VIDEO_CAPS_BGRx "; " GST_VIDEO_CAPS_xBGR "; "
GST_VIDEO_CAPS_GRAY8)
);
/* *INDENT-ON* */
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
GST_DEBUG_CATEGORY_STATIC (GST_CAT_PERFORMANCE);
/* 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 gboolean gst_jpeg_dec_src_event (GstPad * pad, GstEvent * event);
static GstStateChangeReturn gst_jpeg_dec_change_state (GstElement * element,
GstStateChange transition);
static void gst_jpeg_dec_update_qos (GstJpegDec * dec, gdouble proportion,
GstClockTimeDiff diff, GstClockTime ts);
static void gst_jpeg_dec_reset_qos (GstJpegDec * dec);
static void gst_jpeg_dec_read_qos (GstJpegDec * dec, gdouble * proportion,
GstClockTime * time);
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);
g_object_unref (dec->adapter);
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_simple (element_class, "JPEG image decoder",
"Codec/Decoder/Image",
"Decode images from JPEG format", "Wim Taymans <wim@fluendo.com>");
}
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,
JPEG_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");
GST_DEBUG_CATEGORY_GET (GST_CAT_PERFORMANCE, "GST_PERFORMANCE");
}
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_OBJECT (CINFO_GET_JPEGDEC (cinfo), "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_LOG_OBJECT (CINFO_GET_JPEGDEC (cinfo), "init_source");
}
static void
gst_jpeg_dec_skip_input_data (j_decompress_ptr cinfo, glong num_bytes)
{
GST_DEBUG_OBJECT (CINFO_GET_JPEGDEC (cinfo), "skip %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_LOG_OBJECT (CINFO_GET_JPEGDEC (cinfo), "resync_to_start");
return TRUE;
}
static void
gst_jpeg_dec_term_source (j_decompress_ptr cinfo)
{
GST_LOG_OBJECT (CINFO_GET_JPEGDEC (cinfo), "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_LOG_OBJECT (CINFO_GET_JPEGDEC (&cinfo), "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_set_event_function (dec->srcpad,
GST_DEBUG_FUNCPTR (gst_jpeg_dec_src_event));
gst_pad_use_fixed_caps (dec->srcpad);
gst_element_add_pad (GST_ELEMENT (dec), dec->srcpad);
/* 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 = JPEG_DEFAULT_IDCT_METHOD;
dec->adapter = gst_adapter_new ();
}
static gboolean
gst_jpeg_dec_ensure_header (GstJpegDec * dec)
{
gint av;
gint offset;
av = gst_adapter_available (dec->adapter);
/* we expect at least 4 bytes, first of which start marker */
offset = gst_adapter_masked_scan_uint32 (dec->adapter, 0xffffff00, 0xffd8ff00,
0, av);
if (G_UNLIKELY (offset < 0)) {
GST_DEBUG_OBJECT (dec, "No JPEG header in current buffer");
/* not found */
if (av > 4)
gst_adapter_flush (dec->adapter, av - 4);
return FALSE;
}
GST_DEBUG_OBJECT (dec, "Found JPEG header");
gst_adapter_flush (dec->adapter, offset);
return TRUE;
}
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)
{
guint size;
gboolean resync;
GstAdapter *adapter = dec->adapter;
gint offset, noffset;
size = gst_adapter_available (adapter);
/* we expect at least 4 bytes, first of which start marker */
if (gst_adapter_masked_scan_uint32 (adapter, 0xffff0000, 0xffd80000, 0, 4))
return 0;
GST_DEBUG ("Parsing jpeg image data (%u bytes)", size);
GST_DEBUG ("Parse state: offset=%d, resync=%d, entropy len=%d",
dec->parse_offset, dec->parse_resync, dec->parse_entropy_len);
/* offset is 2 less than actual offset;
* - adapter needs at least 4 bytes for scanning,
* - start and end marker ensure at least that much
*/
/* resume from state offset */
offset = dec->parse_offset;
while (1) {
guint frame_len;
guint32 value;
noffset =
gst_adapter_masked_scan_uint32_peek (adapter, 0x0000ff00, 0x0000ff00,
offset, size - offset, &value);
/* lost sync if 0xff marker not where expected */
if ((resync = (noffset != offset))) {
GST_DEBUG ("Lost sync at 0x%08x, resyncing", offset + 2);
}
/* may have marker, but could have been resyncng */
resync = resync || dec->parse_resync;
/* Skip over extra 0xff */
while ((noffset > 0) && ((value & 0xff) == 0xff)) {
noffset++;
noffset =
gst_adapter_masked_scan_uint32_peek (adapter, 0x0000ff00, 0x0000ff00,
noffset, size - noffset, &value);
}
/* enough bytes left for marker? (we need 0xNN after the 0xff) */
if (noffset < 0) {
GST_DEBUG ("at end of input and no EOI marker found, need more data");
goto need_more_data;
}
/* now lock on the marker we found */
offset = noffset;
value = value & 0xff;
if (value == 0xd9) {
GST_DEBUG ("0x%08x: EOI marker", offset + 2);
/* clear parse state */
dec->parse_resync = FALSE;
dec->parse_offset = 0;
return (offset + 4);
}
if (value >= 0xd0 && value <= 0xd7)
frame_len = 0;
else {
/* peek tag and subsequent length */
if (offset + 2 + 4 > size)
goto need_more_data;
else
gst_adapter_masked_scan_uint32_peek (adapter, 0x0, 0x0, offset + 2, 4,
&frame_len);
frame_len = frame_len & 0xffff;
}
GST_DEBUG ("0x%08x: tag %02x, frame_len=%u", offset + 2, value, 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 */
if (offset + 2 + 2 + frame_len + 2 > size) {
goto need_more_data;
}
if (gst_jpeg_dec_parse_tag_has_entropy_segment (value)) {
guint eseglen = dec->parse_entropy_len;
GST_DEBUG ("0x%08x: finding entropy segment length", offset + 2);
noffset = offset + 2 + frame_len + dec->parse_entropy_len;
while (1) {
noffset = gst_adapter_masked_scan_uint32_peek (adapter, 0x0000ff00,
0x0000ff00, noffset, size - noffset, &value);
if (noffset < 0) {
/* need more data */
dec->parse_entropy_len = size - offset - 4 - frame_len - 2;
goto need_more_data;
}
if ((value & 0xff) != 0x00) {
eseglen = noffset - offset - frame_len - 2;
break;
}
noffset++;
}
dec->parse_entropy_len = 0;
frame_len += eseglen;
GST_DEBUG ("entropy segment length=%u => frame_len=%u", eseglen,
frame_len);
}
if (resync) {
/* check if we will still be in sync if we interpret
* this as a sync point and skip this frame */
noffset = offset + frame_len + 2;
noffset = gst_adapter_masked_scan_uint32 (adapter, 0x0000ff00, 0x0000ff00,
noffset, 4);
if (noffset < 0) {
/* ignore and continue resyncing until we hit the end
* of our data or find a sync point that looks okay */
continue;
}
GST_DEBUG ("found sync at 0x%x", offset + 2);
}
offset += frame_len + 2;
}
/* EXITS */
need_more_data:
{
dec->parse_offset = offset;
dec->parse_resync = resync;
return 0;
}
}
/* 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);
g_assert (*htblptr);
/* 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_free_buffers (GstJpegDec * dec)
{
gint i;
for (i = 0; i < 16; i++) {
g_free (dec->idr_y[i]);
g_free (dec->idr_u[i]);
g_free (dec->idr_v[i]);
dec->idr_y[i] = NULL;
dec->idr_u[i] = NULL;
dec->idr_v[i] = NULL;
}
dec->idr_width_allocated = 0;
}
static inline gboolean
gst_jpeg_dec_ensure_buffers (GstJpegDec * dec, guint maxrowbytes)
{
gint i;
if (G_LIKELY (dec->idr_width_allocated == maxrowbytes))
return TRUE;
/* FIXME: maybe just alloc one or three blocks altogether? */
for (i = 0; i < 16; i++) {
dec->idr_y[i] = g_try_realloc (dec->idr_y[i], maxrowbytes);
dec->idr_u[i] = g_try_realloc (dec->idr_u[i], maxrowbytes);
dec->idr_v[i] = g_try_realloc (dec->idr_v[i], maxrowbytes);
if (G_UNLIKELY (!dec->idr_y[i] || !dec->idr_u[i] || !dec->idr_v[i])) {
GST_WARNING_OBJECT (dec, "out of memory, i=%d, bytes=%u", i, maxrowbytes);
return FALSE;
}
}
dec->idr_width_allocated = maxrowbytes;
GST_LOG_OBJECT (dec, "allocated temp memory, %u bytes/row", maxrowbytes);
return TRUE;
}
static void
gst_jpeg_dec_decode_grayscale (GstJpegDec * dec, guchar * base[1],
guint width, guint height, guint pstride, guint rstride)
{
guchar *rows[16];
guchar **scanarray[1] = { rows };
gint i, j, k;
gint lines;
GST_DEBUG_OBJECT (dec, "indirect decoding of grayscale");
if (G_UNLIKELY (!gst_jpeg_dec_ensure_buffers (dec, GST_ROUND_UP_32 (width))))
return;
memcpy (rows, dec->idr_y, 16 * sizeof (gpointer));
i = 0;
while (i < height) {
lines = jpeg_read_raw_data (&dec->cinfo, scanarray, DCTSIZE);
if (G_LIKELY (lines > 0)) {
for (j = 0; (j < DCTSIZE) && (i < height); j++, i++) {
gint p;
p = 0;
for (k = 0; k < width; k++) {
base[0][p] = rows[j][k];
p += pstride;
}
base[0] += rstride;
}
} else {
GST_INFO_OBJECT (dec, "jpeg_read_raw_data() returned 0");
}
}
}
static void
gst_jpeg_dec_decode_rgb (GstJpegDec * dec, guchar * base[3],
guint width, guint height, guint pstride, guint rstride)
{
guchar *r_rows[16], *g_rows[16], *b_rows[16];
guchar **scanarray[3] = { r_rows, g_rows, b_rows };
gint i, j, k;
gint lines;
GST_DEBUG_OBJECT (dec, "indirect decoding of RGB");
if (G_UNLIKELY (!gst_jpeg_dec_ensure_buffers (dec, GST_ROUND_UP_32 (width))))
return;
memcpy (r_rows, dec->idr_y, 16 * sizeof (gpointer));
memcpy (g_rows, dec->idr_u, 16 * sizeof (gpointer));
memcpy (b_rows, dec->idr_v, 16 * sizeof (gpointer));
i = 0;
while (i < height) {
lines = jpeg_read_raw_data (&dec->cinfo, scanarray, DCTSIZE);
if (G_LIKELY (lines > 0)) {
for (j = 0; (j < DCTSIZE) && (i < height); j++, i++) {
gint p;
p = 0;
for (k = 0; k < width; k++) {
base[0][p] = r_rows[j][k];
base[1][p] = g_rows[j][k];
base[2][p] = b_rows[j][k];
p += pstride;
}
base[0] += rstride;
base[1] += rstride;
base[2] += rstride;
}
} else {
GST_INFO_OBJECT (dec, "jpeg_read_raw_data() returned 0");
}
}
}
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, gint comp)
{
guchar *y_rows[16], *u_rows[16], *v_rows[16];
guchar **scanarray[3] = { y_rows, u_rows, v_rows };
gint i, j, k;
gint lines;
GST_DEBUG_OBJECT (dec,
"unadvantageous width or r_h, taking slow route involving memcpy");
if (G_UNLIKELY (!gst_jpeg_dec_ensure_buffers (dec, GST_ROUND_UP_32 (width))))
return;
memcpy (y_rows, dec->idr_y, 16 * sizeof (gpointer));
memcpy (u_rows, dec->idr_u, 16 * sizeof (gpointer));
memcpy (v_rows, dec->idr_v, 16 * sizeof (gpointer));
/* fill chroma components for grayscale */
if (comp == 1) {
GST_DEBUG_OBJECT (dec, "grayscale, filling chroma");
for (i = 0; i < 16; i++) {
memset (u_rows[i], GST_ROUND_UP_32 (width), 0x80);
memset (v_rows[i], GST_ROUND_UP_32 (width), 0x80);
}
}
for (i = 0; i < height; i += r_v * DCTSIZE) {
lines = jpeg_read_raw_data (&dec->cinfo, scanarray, r_v * DCTSIZE);
if (G_LIKELY (lines > 0)) {
for (j = 0, k = 0; j < (r_v * DCTSIZE); j += r_v, k++) {
if (G_LIKELY (base[0] <= last[0])) {
memcpy (base[0], y_rows[j], I420_Y_ROWSTRIDE (width));
base[0] += I420_Y_ROWSTRIDE (width);
}
if (r_v == 2) {
if (G_LIKELY (base[0] <= last[0])) {
memcpy (base[0], y_rows[j + 1], I420_Y_ROWSTRIDE (width));
base[0] += I420_Y_ROWSTRIDE (width);
}
}
if (G_LIKELY (base[1] <= last[1] && base[2] <= last[2])) {
if (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 (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) {
base[1] += I420_U_ROWSTRIDE (width);
base[2] += I420_V_ROWSTRIDE (width);
}
}
} else {
GST_INFO_OBJECT (dec, "jpeg_read_raw_data() returned 0");
}
}
}
#ifndef GST_DISABLE_GST_DEBUG
static inline void
dump_lines (guchar * base[3], guchar ** line[3], int v_samp0, int width)
{
int j;
for (j = 0; j < (v_samp0 * DCTSIZE); ++j) {
GST_LOG ("[%02d] %5d %5d %5d", j,
(line[0][j] >= base[0]) ?
(int) (line[0][j] - base[0]) / I420_Y_ROWSTRIDE (width) : -1,
(line[1][j] >= base[1]) ?
(int) (line[1][j] - base[1]) / I420_U_ROWSTRIDE (width) : -1,
(line[2][j] >= base[2]) ?
(int) (line[2][j] - base[2]) / I420_V_ROWSTRIDE (width) : -1);
}
}
#endif
static GstFlowReturn
gst_jpeg_dec_decode_direct (GstJpegDec * dec, guchar * base[3],
guchar * last[3], guint width, guint height)
{
guchar **line[3]; /* the jpeg line buffer */
guchar *y[4 * DCTSIZE] = { NULL, }; /* alloc enough for the lines */
guchar *u[4 * DCTSIZE] = { NULL, }; /* r_v will be <4 */
guchar *v[4 * DCTSIZE] = { NULL, };
gint i, j;
gint lines, v_samp[3];
line[0] = y;
line[1] = u;
line[2] = v;
v_samp[0] = dec->cinfo.comp_info[0].v_samp_factor;
v_samp[1] = dec->cinfo.comp_info[1].v_samp_factor;
v_samp[2] = dec->cinfo.comp_info[2].v_samp_factor;
if (G_UNLIKELY (v_samp[0] > 2 || v_samp[1] > 2 || v_samp[2] > 2))
goto format_not_supported;
/* let jpeglib decode directly into our final buffer */
GST_DEBUG_OBJECT (dec, "decoding directly into output buffer");
for (i = 0; i < height; i += v_samp[0] * DCTSIZE) {
for (j = 0; j < (v_samp[0] * DCTSIZE); ++j) {
/* Y */
line[0][j] = base[0] + (i + j) * I420_Y_ROWSTRIDE (width);
if (G_UNLIKELY (line[0][j] > last[0]))
line[0][j] = last[0];
/* U */
if (v_samp[1] == v_samp[0]) {
line[1][j] = base[1] + ((i + j) / 2) * I420_U_ROWSTRIDE (width);
} else if (j < (v_samp[1] * DCTSIZE)) {
line[1][j] = base[1] + ((i / 2) + j) * I420_U_ROWSTRIDE (width);
}
if (G_UNLIKELY (line[1][j] > last[1]))
line[1][j] = last[1];
/* V */
if (v_samp[2] == v_samp[0]) {
line[2][j] = base[2] + ((i + j) / 2) * I420_V_ROWSTRIDE (width);
} else if (j < (v_samp[2] * DCTSIZE)) {
line[2][j] = base[2] + ((i / 2) + j) * I420_V_ROWSTRIDE (width);
}
if (G_UNLIKELY (line[2][j] > last[2]))
line[2][j] = last[2];
}
/* dump_lines (base, line, v_samp[0], width); */
lines = jpeg_read_raw_data (&dec->cinfo, line, v_samp[0] * DCTSIZE);
if (G_UNLIKELY (!lines)) {
GST_INFO_OBJECT (dec, "jpeg_read_raw_data() returned 0");
}
}
return GST_FLOW_OK;
format_not_supported:
{
GST_ELEMENT_ERROR (dec, STREAM, DECODE,
(_("Failed to decode JPEG image")),
("Unsupported subsampling schema: v_samp factors: %u %u %u",
v_samp[0], v_samp[1], v_samp[2]));
return GST_FLOW_ERROR;
}
}
static void
gst_jpeg_dec_update_qos (GstJpegDec * dec, gdouble proportion,
GstClockTimeDiff diff, GstClockTime ts)
{
GST_OBJECT_LOCK (dec);
dec->proportion = proportion;
if (G_LIKELY (ts != GST_CLOCK_TIME_NONE)) {
if (G_UNLIKELY (diff > 0))
dec->earliest_time = ts + 2 * diff + dec->qos_duration;
else
dec->earliest_time = ts + diff;
} else {
dec->earliest_time = GST_CLOCK_TIME_NONE;
}
GST_OBJECT_UNLOCK (dec);
}
static void
gst_jpeg_dec_reset_qos (GstJpegDec * dec)
{
gst_jpeg_dec_update_qos (dec, 0.5, 0, GST_CLOCK_TIME_NONE);
}
static void
gst_jpeg_dec_read_qos (GstJpegDec * dec, gdouble * proportion,
GstClockTime * time)
{
GST_OBJECT_LOCK (dec);
*proportion = dec->proportion;
*time = dec->earliest_time;
GST_OBJECT_UNLOCK (dec);
}
/* Perform qos calculations before decoding the next frame. Returns TRUE if the
* frame should be decoded, FALSE if the frame can be dropped entirely */
static gboolean
gst_jpeg_dec_do_qos (GstJpegDec * dec, GstClockTime timestamp)
{
GstClockTime qostime, earliest_time;
gdouble proportion;
/* no timestamp, can't do QoS => decode frame */
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (timestamp))) {
GST_LOG_OBJECT (dec, "invalid timestamp, can't do QoS, decode frame");
return TRUE;
}
/* get latest QoS observation values */
gst_jpeg_dec_read_qos (dec, &proportion, &earliest_time);
/* skip qos if we have no observation (yet) => decode frame */
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (earliest_time))) {
GST_LOG_OBJECT (dec, "no observation yet, decode frame");
return TRUE;
}
/* qos is done on running time */
qostime = gst_segment_to_running_time (&dec->segment, GST_FORMAT_TIME,
timestamp);
/* see how our next timestamp relates to the latest qos timestamp */
GST_LOG_OBJECT (dec, "qostime %" GST_TIME_FORMAT ", earliest %"
GST_TIME_FORMAT, GST_TIME_ARGS (qostime), GST_TIME_ARGS (earliest_time));
if (qostime != GST_CLOCK_TIME_NONE && qostime <= earliest_time) {
GST_DEBUG_OBJECT (dec, "we are late, drop frame");
return FALSE;
}
GST_LOG_OBJECT (dec, "decode frame");
return TRUE;
}
static void
gst_jpeg_dec_negotiate (GstJpegDec * dec, gint width, gint height, gint clrspc)
{
GstCaps *caps;
GstVideoFormat format;
if (G_UNLIKELY (width == dec->caps_width && height == dec->caps_height &&
dec->framerate_numerator == dec->caps_framerate_numerator &&
dec->framerate_denominator == dec->caps_framerate_denominator &&
clrspc == dec->clrspc))
return;
/* framerate == 0/1 is a still frame */
if (dec->framerate_denominator == 0) {
dec->framerate_numerator = 0;
dec->framerate_denominator = 1;
}
/* calculate or assume an average frame duration for QoS purposes */
GST_OBJECT_LOCK (dec);
if (dec->framerate_numerator != 0) {
dec->qos_duration = gst_util_uint64_scale (GST_SECOND,
dec->framerate_denominator, dec->framerate_numerator);
} else {
/* if not set just use 25fps */
dec->qos_duration = gst_util_uint64_scale (GST_SECOND, 1, 25);
}
GST_OBJECT_UNLOCK (dec);
if (dec->cinfo.jpeg_color_space == JCS_RGB) {
gint i;
GstCaps *allowed_caps;
GST_DEBUG_OBJECT (dec, "selecting RGB format");
/* retrieve allowed caps, and find the first one that reasonably maps
* to the parameters of the colourspace */
caps = gst_pad_get_allowed_caps (dec->srcpad);
if (!caps) {
GST_DEBUG_OBJECT (dec, "... but no peer, using template caps");
/* need to copy because get_allowed_caps returns a ref,
* and get_pad_template_caps doesn't */
caps = gst_caps_copy (gst_pad_get_pad_template_caps (dec->srcpad));
}
/* avoid lists of fourcc, etc */
allowed_caps = gst_caps_normalize (caps);
gst_caps_unref (caps);
caps = NULL;
GST_LOG_OBJECT (dec, "allowed source caps %" GST_PTR_FORMAT, allowed_caps);
for (i = 0; i < gst_caps_get_size (allowed_caps); i++) {
if (caps)
gst_caps_unref (caps);
caps = gst_caps_copy_nth (allowed_caps, i);
/* sigh, ds and _parse_caps need fixed caps for parsing, fixate */
gst_pad_fixate_caps (dec->srcpad, caps);
GST_LOG_OBJECT (dec, "checking caps %" GST_PTR_FORMAT, caps);
if (!gst_video_format_parse_caps (caps, &format, NULL, NULL))
continue;
/* we'll settle for the first (preferred) downstream rgb format */
if (gst_video_format_is_rgb (format))
break;
/* default fall-back */
format = GST_VIDEO_FORMAT_RGB;
}
if (caps)
gst_caps_unref (caps);
gst_caps_unref (allowed_caps);
caps = gst_video_format_new_caps (format, width, height,
dec->framerate_numerator, dec->framerate_denominator, 1, 1);
dec->outsize = gst_video_format_get_size (format, width, height);
/* some format info */
dec->offset[0] =
gst_video_format_get_component_offset (format, 0, width, height);
dec->offset[1] =
gst_video_format_get_component_offset (format, 1, width, height);
dec->offset[2] =
gst_video_format_get_component_offset (format, 2, width, height);
/* equal for all components */
dec->stride = gst_video_format_get_row_stride (format, 0, width);
dec->inc = gst_video_format_get_pixel_stride (format, 0);
} else if (dec->cinfo.jpeg_color_space == JCS_GRAYSCALE) {
/* TODO is anything else then 8bit supported in jpeg? */
format = GST_VIDEO_FORMAT_GRAY8;
caps = gst_video_format_new_caps (format, width, height,
dec->framerate_numerator, dec->framerate_denominator, 1, 1);
dec->outsize = gst_video_format_get_size (format, width, height);
dec->offset[0] =
gst_video_format_get_component_offset (format, 0, width, height);
dec->stride = gst_video_format_get_row_stride (format, 0, width);
dec->inc = gst_video_format_get_pixel_stride (format, 0);
} else {
/* go for plain and simple I420 */
/* TODO other YUV cases ? */
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);
dec->outsize = I420_SIZE (width, height);
}
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_DEBUG_OBJECT (dec, "max_h_samp_factor=%d", dec->cinfo.max_h_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;
}
static GstFlowReturn
gst_jpeg_dec_chain (GstPad * pad, GstBuffer * buf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstJpegDec *dec;
GstBuffer *outbuf = NULL;
guchar *data, *outdata;
guchar *base[3], *last[3];
guint img_len, outsize;
gint width, height;
gint r_h, r_v;
guint code, hdr_ok;
GstClockTime timestamp, duration;
dec = GST_JPEG_DEC (GST_PAD_PARENT (pad));
timestamp = GST_BUFFER_TIMESTAMP (buf);
duration = GST_BUFFER_DURATION (buf);
if (GST_CLOCK_TIME_IS_VALID (timestamp))
dec->next_ts = timestamp;
if (GST_BUFFER_IS_DISCONT (buf)) {
GST_DEBUG_OBJECT (dec, "buffer has DISCONT flag set");
dec->discont = TRUE;
if (!dec->packetized && gst_adapter_available (dec->adapter)) {
GST_WARNING_OBJECT (dec, "DISCONT buffer in non-packetized mode, bad");
gst_adapter_clear (dec->adapter);
}
}
gst_adapter_push (dec->adapter, buf);
buf = NULL;
/* If we are non-packetized and know the total incoming size in bytes,
* just wait until we have enough before doing any processing. */
if (!dec->packetized && (dec->segment.format == GST_FORMAT_BYTES) &&
(dec->segment.stop != -1) &&
(gst_adapter_available (dec->adapter) < dec->segment.stop)) {
/* We assume that non-packetized input in bytes is *one* single jpeg image */
GST_DEBUG ("Non-packetized mode. Got %d bytes, need %" G_GINT64_FORMAT,
gst_adapter_available (dec->adapter), dec->segment.stop);
goto need_more_data;
}
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_adapter_available (dec->adapter);
} 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;
}
/* QoS: if we're too late anyway, skip decoding */
if (dec->packetized && !gst_jpeg_dec_do_qos (dec, timestamp))
goto skip_decoding;
data = (guint8 *) gst_adapter_peek (dec->adapter, img_len);
GST_LOG_OBJECT (dec, "image size = %u", img_len);
dec->jsrc.pub.next_input_byte = data;
dec->jsrc.pub.bytes_in_buffer = img_len;
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 */
hdr_ok = jpeg_read_header (&dec->cinfo, TRUE);
if (G_UNLIKELY (hdr_ok != JPEG_HEADER_OK)) {
GST_WARNING_OBJECT (dec, "reading the header failed, %d", hdr_ok);
}
r_h = dec->cinfo.comp_info[0].h_samp_factor;
r_v = dec->cinfo.comp_info[0].v_samp_factor;
GST_LOG_OBJECT (dec, "r_h = %d, r_v = %d", r_h, r_v);
GST_LOG_OBJECT (dec, "num_components=%d", dec->cinfo.num_components);
GST_LOG_OBJECT (dec, "jpeg_color_space=%d", dec->cinfo.jpeg_color_space);
if (dec->cinfo.num_components > 3)
goto components_not_supported;
/* verify color space expectation to avoid going *boom* or bogus output */
if (dec->cinfo.jpeg_color_space != JCS_YCbCr &&
dec->cinfo.jpeg_color_space != JCS_GRAYSCALE &&
dec->cinfo.jpeg_color_space != JCS_RGB)
goto unsupported_colorspace;
#ifndef GST_DISABLE_GST_DEBUG
{
gint i;
for (i = 0; i < dec->cinfo.num_components; ++i) {
GST_LOG_OBJECT (dec, "[%d] h_samp_factor=%d, v_samp_factor=%d, cid=%d",
i, dec->cinfo.comp_info[i].h_samp_factor,
dec->cinfo.comp_info[i].v_samp_factor,
dec->cinfo.comp_info[i].component_id);
}
}
#endif
/* prepare for raw output */
dec->cinfo.do_fancy_upsampling = FALSE;
dec->cinfo.do_block_smoothing = FALSE;
dec->cinfo.out_color_space = dec->cinfo.jpeg_color_space;
dec->cinfo.dct_method = dec->idct_method;
dec->cinfo.raw_data_out = TRUE;
GST_LOG_OBJECT (dec, "starting decompress");
guarantee_huff_tables (&dec->cinfo);
if (!jpeg_start_decompress (&dec->cinfo)) {
GST_WARNING_OBJECT (dec, "failed to start decompression cycle");
}
/* sanity checks to get safe and reasonable output */
switch (dec->cinfo.jpeg_color_space) {
case JCS_GRAYSCALE:
if (dec->cinfo.num_components != 1)
goto invalid_yuvrgbgrayscale;
break;
case JCS_RGB:
if (dec->cinfo.num_components != 3 || dec->cinfo.max_v_samp_factor > 1 ||
dec->cinfo.max_h_samp_factor > 1)
goto invalid_yuvrgbgrayscale;
break;
case JCS_YCbCr:
if (dec->cinfo.num_components != 3 ||
r_v > 2 || r_v < dec->cinfo.comp_info[0].v_samp_factor ||
r_v < dec->cinfo.comp_info[1].v_samp_factor ||
r_h < dec->cinfo.comp_info[0].h_samp_factor ||
r_h < dec->cinfo.comp_info[1].h_samp_factor)
goto invalid_yuvrgbgrayscale;
break;
default:
g_assert_not_reached ();
break;
}
width = dec->cinfo.output_width;
height = dec->cinfo.output_height;
if (G_UNLIKELY (width < MIN_WIDTH || width > MAX_WIDTH ||
height < MIN_HEIGHT || height > MAX_HEIGHT))
goto wrong_size;
gst_jpeg_dec_negotiate (dec, width, height, dec->cinfo.jpeg_color_space);
ret = gst_pad_alloc_buffer_and_set_caps (dec->srcpad, GST_BUFFER_OFFSET_NONE,
dec->outsize, GST_PAD_CAPS (dec->srcpad), &outbuf);
if (G_UNLIKELY (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;
if (dec->cinfo.jpeg_color_space == JCS_RGB) {
base[0] = outdata + dec->offset[0];
base[1] = outdata + dec->offset[1];
base[2] = outdata + dec->offset[2];
gst_jpeg_dec_decode_rgb (dec, base, width, height, dec->inc, dec->stride);
} else if (dec->cinfo.jpeg_color_space == JCS_GRAYSCALE) {
base[0] = outdata + dec->offset[0];
gst_jpeg_dec_decode_grayscale (dec, base, width, height, dec->inc,
dec->stride);
} else {
/* mind the swap, jpeglib outputs blue chroma first
* ensonic: I see no swap?
*/
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 (reqired scanline buffer height = %u)",
dec->cinfo.rec_outbuf_height);
/* 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 (G_UNLIKELY (width % (dec->cinfo.max_h_samp_factor * DCTSIZE) != 0
|| dec->cinfo.comp_info[0].h_samp_factor != 2
|| dec->cinfo.comp_info[1].h_samp_factor != 1
|| dec->cinfo.comp_info[2].h_samp_factor != 1)) {
GST_CAT_LOG_OBJECT (GST_CAT_PERFORMANCE, dec,
"indirect decoding using extra buffer copy");
gst_jpeg_dec_decode_indirect (dec, base, last, width, height, r_v, r_h,
dec->cinfo.num_components);
} else {
ret = gst_jpeg_dec_decode_direct (dec, base, last, width, height);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto decode_direct_failed;
}
}
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);
skip_decoding:
done:
gst_adapter_flush (dec->adapter, img_len);
exit:
return ret;
/* special cases */
need_more_data:
{
GST_LOG_OBJECT (dec, "we need more data");
if (outbuf) {
gst_buffer_unref (outbuf);
outbuf = NULL;
}
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:
{
gchar err_msg[JMSG_LENGTH_MAX];
dec->jerr.pub.format_message ((j_common_ptr) (&dec->cinfo), err_msg);
GST_ELEMENT_ERROR (dec, STREAM, DECODE,
(_("Failed to decode JPEG image")), ("Error #%u: %s", code, err_msg));
if (outbuf) {
gst_buffer_unref (outbuf);
outbuf = NULL;
}
ret = GST_FLOW_ERROR;
goto done;
}
decode_direct_failed:
{
/* already posted an error message */
jpeg_abort_decompress (&dec->cinfo);
gst_buffer_replace (&outbuf, NULL);
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;
}
components_not_supported:
{
GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL),
("more components than supported: %d > 3", dec->cinfo.num_components));
ret = GST_FLOW_ERROR;
goto done;
}
unsupported_colorspace:
{
GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL),
("Picture has unknown or unsupported colourspace"));
ret = GST_FLOW_ERROR;
goto done;
}
invalid_yuvrgbgrayscale:
{
GST_ELEMENT_ERROR (dec, STREAM, DECODE, (NULL),
("Picture is corrupt or unhandled YUV/RGB/grayscale layout"));
ret = GST_FLOW_ERROR;
goto done;
}
}
static gboolean
gst_jpeg_dec_src_event (GstPad * pad, GstEvent * event)
{
GstJpegDec *dec;
gboolean res;
dec = GST_JPEG_DEC (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_QOS:{
GstClockTimeDiff diff;
GstClockTime timestamp;
gdouble proportion;
gst_event_parse_qos (event, &proportion, &diff, &timestamp);
gst_jpeg_dec_update_qos (dec, proportion, diff, timestamp);
break;
}
default:
break;
}
res = gst_pad_push_event (dec->sinkpad, event);
gst_object_unref (dec);
return res;
}
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);
gst_segment_init (&dec->segment, GST_FORMAT_UNDEFINED);
gst_adapter_clear (dec->adapter);
dec->parse_offset = 0;
dec->parse_entropy_len = 0;
dec->parse_resync = FALSE;
gst_jpeg_dec_reset_qos (dec);
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->clrspc = -1;
dec->packetized = FALSE;
dec->next_ts = 0;
dec->discont = TRUE;
dec->parse_offset = 0;
dec->parse_entropy_len = 0;
dec->parse_resync = FALSE;
gst_segment_init (&dec->segment, GST_FORMAT_UNDEFINED);
gst_jpeg_dec_reset_qos (dec);
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:
gst_adapter_clear (dec->adapter);
gst_jpeg_dec_free_buffers (dec);
break;
default:
break;
}
return ret;
}
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