--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_good/ext/jpeg/gstjpegdec.c Fri Apr 16 15:15:52 2010 +0300
@@ -0,0 +1,998 @@
+/* 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.
+ */
+
+
+#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.taymans@tvd.be>");
+
+#define MIN_WIDTH 16
+#define MAX_WIDTH 4096
+#define MIN_HEIGHT 16
+#define MAX_HEIGHT 4096
+
+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 GstFlowReturn gst_jpeg_dec_chain (GstPad * pad, GstBuffer * buffer);
+static gboolean gst_jpeg_dec_setcaps (GstPad * pad, GstCaps * caps);
+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);
+
+ 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;
+
+ gstelement_class->change_state =
+ GST_DEBUG_FUNCPTR (gst_jpeg_dec_change_state);
+
+ GST_DEBUG_CATEGORY_INIT (jpeg_dec_debug, "jpegdec", 0, "JPEG decoder");
+}
+
+static gboolean
+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 gboolean
+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));
+
+ dec->srcpad =
+ gst_pad_new_from_static_template (&gst_jpeg_dec_src_pad_template, "src");
+ 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;
+}
+
+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 0x%08x", 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;
+}
+
+static void
+gst_jpeg_dec_decode_indirect (GstJpegDec * dec, guchar * base[3],
+ guchar * last[3], guint width, guint height, gint r_v)
+{
+#ifdef SYMBIAN
+ static guchar y[16][MAX_WIDTH];
+ static guchar u[8][MAX_WIDTH / 2];
+ static guchar v[8][MAX_WIDTH / 2];
+ static 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]
+ };
+ static guchar *u_rows[8] = { u[0], u[1], u[2], u[3], u[4], u[5], u[6], u[7] };
+ static guchar *v_rows[8] = { v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7] };
+ static guchar **scanarray[3] = { y_rows, u_rows, v_rows };
+#else // SYMBIAN
+ guchar y[16][MAX_WIDTH];
+ guchar u[8][MAX_WIDTH / 2];
+ guchar v[8][MAX_WIDTH / 2];
+ 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[8] = { u[0], u[1], u[2], u[3], u[4], u[5], u[6], u[7] };
+ guchar *v_rows[8] = { v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7] };
+ guchar **scanarray[3] = { y_rows, u_rows, v_rows };
+#endif // SYMBIAN
+ gint i, j, k;
+
+ GST_DEBUG_OBJECT (dec,
+ "unadvantageous width, 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);
+ }
+ memcpy (base[1], u_rows[k], I420_U_ROWSTRIDE (width));
+ memcpy (base[2], v_rows[k], I420_V_ROWSTRIDE (width));
+ 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 */
+ gint i, j, k;
+
+ line[0] = g_new0 (guchar *, (r_v * DCTSIZE));
+ line[1] = g_new0 (guchar *, (r_v * DCTSIZE));
+ line[2] = g_new0 (guchar *, (r_v * DCTSIZE));
+
+ /* 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);
+ }
+
+ g_free (line[0]);
+ g_free (line[1]);
+ g_free (line[2]);
+}
+
+
+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;
+ gint width, height;
+ gint r_h, r_v;
+ gint i;
+ guint code;
+ GstClockTime timestamp, duration;
+
+ dec = GST_JPEG_DEC (GST_OBJECT_PARENT (pad));
+
+ timestamp = GST_BUFFER_TIMESTAMP (buf);
+ duration = GST_BUFFER_DURATION (buf);
+
+/*
+ GST_LOG_OBJECT (dec, "Received buffer: %d bytes, ts=%" GST_TIME_FORMAT
+ ", dur=%" GST_TIME_FORMAT, GST_BUFFER_SIZE (buf),
+ GST_TIME_ARGS (timestamp), GST_TIME_ARGS (duration));
+*/
+
+ 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]);
+ 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 ("num_components=%d, comps_in_scan=%d\n",
+ dec->cinfo.num_components, dec->cinfo.comps_in_scan);
+ for (i = 0; i < dec->cinfo.num_components; ++i) {
+ GST_DEBUG ("[%d] h_samp_factor=%d, v_samp_factor=%d\n", i,
+ dec->cinfo.cur_comp_info[i]->h_samp_factor,
+ dec->cinfo.cur_comp_info[i]->v_samp_factor);
+ }
+
+ dec->cinfo.do_fancy_upsampling = FALSE;
+ dec->cinfo.do_block_smoothing = FALSE;
+ dec->cinfo.out_color_space = JCS_YCbCr;
+ dec->cinfo.dct_method = JDCT_IFAST;
+ 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_use_fixed_caps (dec->srcpad);
+ 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;
+ }
+
+ ret = gst_pad_alloc_buffer_and_set_caps (dec->srcpad, GST_BUFFER_OFFSET_NONE,
+ I420_SIZE (width, height), GST_PAD_CAPS (dec->srcpad), &outbuf);
+ if (ret != GST_FLOW_OK)
+ goto alloc_failed;
+
+ outdata = GST_BUFFER_DATA (outbuf);
+ 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;
+
+ GST_LOG_OBJECT (dec, "width %d, height %d, buffer size %d, required size %d",
+ width, height, GST_BUFFER_SIZE (outbuf), I420_SIZE (width, height));
+
+ /* 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 (width % (dec->cinfo.max_h_samp_factor * DCTSIZE) != 0) {
+ gst_jpeg_dec_decode_indirect (dec, base, last, width, height, r_v);
+ } else {
+ gst_jpeg_dec_decode_direct (dec, base, last, width, height, r_v);
+ }
+
+ GST_LOG_OBJECT (dec, "decompressing finished");
+ jpeg_finish_decompress (&dec->cinfo);
+
+ 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;
+ }
+ return ret;
+
+ /* special cases */
+need_more_data:
+ {
+ GST_LOG_OBJECT (dec, "we need more data");
+ return GST_FLOW_OK;
+ }
+ /* 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);
+ if (GST_FLOW_IS_FATAL (ret)) {
+ GST_ELEMENT_ERROR (dec, STREAM, DECODE,
+ ("Buffer allocation failed, reason: %s", reason),
+ ("Buffer allocation failed, reason: %s", reason));
+ }
+ return ret;
+ }
+}
+
+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;
+ 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;
+}