gstreamer/ext/jpeg/gstjpegdec.c

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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.
*/
#include <string.h>
/*#define DEBUG_ENABLED*/
#include "gstjpegdec.h"
extern GstPadTemplate *jpegdec_src_template, *jpegdec_sink_template;
/* elementfactory information */
GstElementDetails gst_jpegdec_details = {
"jpeg image decoder",
"Codec/Image/Decoder",
"LGPL",
".jpeg",
VERSION,
"Wim Taymans <wim.taymans@tvd.be>",
"(C) 2000",
};
/* JpegDec signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static void gst_jpegdec_class_init (GstJpegDec *klass);
static void gst_jpegdec_init (GstJpegDec *jpegdec);
static void gst_jpegdec_chain (GstPad *pad, GstBuffer *buf);
static GstElementClass *parent_class = NULL;
/*static guint gst_jpegdec_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_jpegdec_get_type(void) {
static GType jpegdec_type = 0;
if (!jpegdec_type) {
static const GTypeInfo jpegdec_info = {
sizeof(GstJpegDec), NULL,
NULL,
(GClassInitFunc)gst_jpegdec_class_init,
NULL,
NULL,
sizeof(GstJpegDec),
0,
(GInstanceInitFunc)gst_jpegdec_init,
};
jpegdec_type = g_type_register_static(GST_TYPE_ELEMENT, "GstJpegDec", &jpegdec_info, 0);
}
return jpegdec_type;
}
static void
gst_jpegdec_class_init (GstJpegDec *klass)
{
GstElementClass *gstelement_class;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
}
static void
gst_jpegdec_init_source (j_decompress_ptr cinfo)
{
GST_DEBUG (0,"gst_jpegdec_chain: init_source");
}
static gboolean
gst_jpegdec_fill_input_buffer (j_decompress_ptr cinfo)
{
GST_DEBUG (0,"gst_jpegdec_chain: fill_input_buffer");
return TRUE;
}
static void
gst_jpegdec_skip_input_data (j_decompress_ptr cinfo, glong num_bytes)
{
GST_DEBUG (0,"gst_jpegdec_chain: skip_input_data");
}
static gboolean
gst_jpegdec_resync_to_restart (j_decompress_ptr cinfo, gint desired)
{
GST_DEBUG (0,"gst_jpegdec_chain: resync_to_start");
return TRUE;
}
static void
gst_jpegdec_term_source (j_decompress_ptr cinfo)
{
GST_DEBUG (0,"gst_jpegdec_chain: term_source");
}
static void
gst_jpegdec_init (GstJpegDec *jpegdec)
{
GST_DEBUG (0,"gst_jpegdec_init: initializing");
/* create the sink and src pads */
jpegdec->sinkpad = gst_pad_new_from_template (jpegdec_sink_template, "sink");
gst_element_add_pad(GST_ELEMENT(jpegdec),jpegdec->sinkpad);
gst_pad_set_chain_function(jpegdec->sinkpad,gst_jpegdec_chain);
jpegdec->srcpad = gst_pad_new_from_template (jpegdec_src_template, "src");
gst_element_add_pad(GST_ELEMENT(jpegdec),jpegdec->srcpad);
/* initialize the jpegdec decoder state */
jpegdec->next_time = 0;
/* reset the initial video state */
jpegdec->format = -1;
jpegdec->width = -1;
jpegdec->height = -1;
jpegdec->line[0] = NULL;
jpegdec->line[1] = NULL;
jpegdec->line[2] = NULL;
/* setup jpeglib */
memset(&jpegdec->cinfo, 0, sizeof(jpegdec->cinfo));
memset(&jpegdec->jerr, 0, sizeof(jpegdec->jerr));
jpegdec->cinfo.err = jpeg_std_error(&jpegdec->jerr);
jpeg_create_decompress(&jpegdec->cinfo);
jpegdec->jsrc.init_source = gst_jpegdec_init_source;
jpegdec->jsrc.fill_input_buffer = gst_jpegdec_fill_input_buffer;
jpegdec->jsrc.skip_input_data = gst_jpegdec_skip_input_data;
jpegdec->jsrc.resync_to_restart = gst_jpegdec_resync_to_restart;
jpegdec->jsrc.term_source = gst_jpegdec_term_source;
jpegdec->cinfo.src = &jpegdec->jsrc;
}
static void
gst_jpegdec_chain (GstPad *pad, GstBuffer *buf)
{
GstJpegDec *jpegdec;
guchar *data, *outdata;
gulong size, outsize;
GstBuffer *outbuf;
/*GstMeta *meta;*/
gint width, height, width2;
guchar *base[3];
gint i,j, k;
gint r_h, r_v;
g_return_if_fail(pad != NULL);
g_return_if_fail(GST_IS_PAD(pad));
g_return_if_fail(buf != NULL);
/*g_return_if_fail(GST_IS_BUFFER(buf));*/
jpegdec = GST_JPEGDEC (GST_OBJECT_PARENT (pad));
if (!GST_PAD_IS_LINKED (jpegdec->srcpad)) {
gst_buffer_unref (buf);
return;
}
data = (guchar *)GST_BUFFER_DATA(buf);
size = GST_BUFFER_SIZE(buf);
GST_DEBUG (0,"gst_jpegdec_chain: got buffer of %ld bytes in '%s'",size,
GST_OBJECT_NAME (jpegdec));
jpegdec->jsrc.next_input_byte = data;
jpegdec->jsrc.bytes_in_buffer = size;
GST_DEBUG (0,"gst_jpegdec_chain: reading header %08lx", *(gulong *)data);
jpeg_read_header(&jpegdec->cinfo, TRUE);
r_h = jpegdec->cinfo.cur_comp_info[0]->h_samp_factor;
r_v = jpegdec->cinfo.cur_comp_info[0]->v_samp_factor;
/*g_print ("%d %d\n", r_h, r_v);*/
/*g_print ("%d %d\n", jpegdec->cinfo.cur_comp_info[1]->h_samp_factor, jpegdec->cinfo.cur_comp_info[1]->v_samp_factor);*/
/*g_print ("%d %d\n", jpegdec->cinfo.cur_comp_info[2]->h_samp_factor, jpegdec->cinfo.cur_comp_info[2]->v_samp_factor);*/
jpegdec->cinfo.do_fancy_upsampling = FALSE;
jpegdec->cinfo.do_block_smoothing = FALSE;
jpegdec->cinfo.out_color_space = JCS_YCbCr;
jpegdec->cinfo.dct_method = JDCT_IFAST;
jpegdec->cinfo.raw_data_out = TRUE;
GST_DEBUG (0,"gst_jpegdec_chain: starting decompress");
jpeg_start_decompress(&jpegdec->cinfo);
width = jpegdec->cinfo.output_width;
height = jpegdec->cinfo.output_height;
GST_DEBUG (0,"gst_jpegdec_chain: width %d, height %d", width, height);
outbuf = gst_buffer_new();
outsize = GST_BUFFER_SIZE(outbuf) = width*height +
width*height / 2;
outdata = GST_BUFFER_DATA(outbuf) = g_malloc(outsize);
GST_BUFFER_TIMESTAMP(outbuf) = GST_BUFFER_TIMESTAMP(buf);
if (jpegdec->height != height) {
jpegdec->line[0] = g_realloc(jpegdec->line[0], height*sizeof(char*));
jpegdec->line[1] = g_realloc(jpegdec->line[1], height*sizeof(char*));
jpegdec->line[2] = g_realloc(jpegdec->line[2], height*sizeof(char*));
jpegdec->height = height;
gst_pad_try_set_caps (jpegdec->srcpad,
GST_CAPS_NEW (
"jpegdec_caps",
"video/raw",
"format", GST_PROPS_FOURCC (GST_MAKE_FOURCC ('I','4','2','0')),
"width", GST_PROPS_INT (width),
"height", GST_PROPS_INT (height)
));
}
/* mind the swap, jpeglib outputs blue chroma first */
base[0] = outdata;
base[1] = base[0]+width*height;
base[2] = base[1]+width*height/4;
width2 = width >> 1;
GST_DEBUG (0,"gst_jpegdec_chain: decompressing %u", jpegdec->cinfo.rec_outbuf_height);
for (i = 0; i < height; i += r_v*DCTSIZE) {
for (j=0, k=0; j< (r_v*DCTSIZE); j += r_v, k++) {
jpegdec->line[0][j] = base[0]; base[0] += width;
if (r_v == 2) {
jpegdec->line[0][j+1] = base[0]; base[0] += width;
}
jpegdec->line[1][k] = base[1];
jpegdec->line[2][k] = base[2];
if (r_v == 2 || k&1) {
base[1] += width2; base[2] += width2;
}
}
/*g_print ("%d\n", jpegdec->cinfo.output_scanline);*/
jpeg_read_raw_data(&jpegdec->cinfo, jpegdec->line, r_v*DCTSIZE);
}
GST_DEBUG (0,"gst_jpegdec_chain: decompressing finished");
jpeg_finish_decompress(&jpegdec->cinfo);
GST_DEBUG (0,"gst_jpegdec_chain: sending buffer");
gst_pad_push(jpegdec->srcpad, outbuf);
gst_buffer_unref(buf);
}