gstreamer/ext/jpeg/gstjpegenc.c

306 lines
8.7 KiB
C
Raw Normal View History

/* 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>
#include "gstjpegenc.h"
/* elementfactory information */
GstElementDetails gst_jpegenc_details = {
"jpeg image encoder",
"Codec/Image/Encoder",
"LGPL",
".jpeg",
VERSION,
"Wim Taymans <wim.taymans@tvd.be>",
"(C) 2000",
};
/* JpegEnc signals and args */
enum {
FRAME_ENCODED,
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static void gst_jpegenc_class_init (GstJpegEnc *klass);
static void gst_jpegenc_init (GstJpegEnc *jpegenc);
static void gst_jpegenc_chain (GstPad *pad,GstBuffer *buf);
static GstBuffer *gst_jpegenc_get (GstPad *pad);
static void gst_jpegenc_resync (GstJpegEnc *jpegenc);
static GstElementClass *parent_class = NULL;
static guint gst_jpegenc_signals[LAST_SIGNAL] = { 0 };
GType
gst_jpegenc_get_type (void)
{
static GType jpegenc_type = 0;
if (!jpegenc_type) {
static const GTypeInfo jpegenc_info = {
sizeof(GstJpegEnc), NULL,
NULL,
(GClassInitFunc)gst_jpegenc_class_init,
NULL,
NULL,
sizeof(GstJpegEnc),
0,
(GInstanceInitFunc)gst_jpegenc_init,
};
jpegenc_type = g_type_register_static(GST_TYPE_ELEMENT, "GstJpegEnc", &jpegenc_info, 0);
}
return jpegenc_type;
}
static void
gst_jpegenc_class_init (GstJpegEnc *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
gst_jpegenc_signals[FRAME_ENCODED] =
g_signal_new ("frame_encoded", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstJpegEncClass, frame_encoded), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
}
static void
gst_jpegenc_init_destination (j_compress_ptr cinfo)
{
GST_DEBUG (0,"gst_jpegenc_chain: init_destination");
}
static gboolean
gst_jpegenc_flush_destination (j_compress_ptr cinfo)
{
GST_DEBUG (0,"gst_jpegenc_chain: flush_destination: buffer too small !!!");
return TRUE;
}
static void gst_jpegenc_term_destination (j_compress_ptr cinfo)
{
GST_DEBUG (0,"gst_jpegenc_chain: term_source");
}
static void
gst_jpegenc_init (GstJpegEnc *jpegenc)
{
/* create the sink and src pads */
jpegenc->sinkpad = gst_pad_new("sink",GST_PAD_SINK);
gst_element_add_pad(GST_ELEMENT(jpegenc),jpegenc->sinkpad);
gst_pad_set_chain_function(jpegenc->sinkpad,gst_jpegenc_chain);
gst_pad_set_get_function(jpegenc->sinkpad,gst_jpegenc_get);
jpegenc->srcpad = gst_pad_new("src",GST_PAD_SRC);
gst_element_add_pad(GST_ELEMENT(jpegenc),jpegenc->srcpad);
/* reset the initial video state */
jpegenc->width = -1;
jpegenc->height = -1;
/* setup jpeglib */
memset(&jpegenc->cinfo, 0, sizeof(jpegenc->cinfo));
memset(&jpegenc->jerr, 0, sizeof(jpegenc->jerr));
jpegenc->cinfo.err = jpeg_std_error(&jpegenc->jerr);
jpeg_create_compress(&jpegenc->cinfo);
GST_DEBUG (0,"gst_jpegenc_init: setting line buffers");
jpegenc->line[0] = NULL;
jpegenc->line[1] = NULL;
jpegenc->line[2] = NULL;
gst_jpegenc_resync(jpegenc);
jpegenc->jdest.init_destination = gst_jpegenc_init_destination;
jpegenc->jdest.empty_output_buffer = gst_jpegenc_flush_destination;
jpegenc->jdest.term_destination = gst_jpegenc_term_destination;
jpegenc->cinfo.dest = &jpegenc->jdest;
}
static void
gst_jpegenc_resync (GstJpegEnc *jpegenc)
{
guint size = 0;
gint width, height;
GST_DEBUG (0,"gst_jpegenc_resync: resync");
jpegenc->cinfo.image_width = width = jpegenc->width;
jpegenc->cinfo.image_height = height = jpegenc->height;
jpegenc->cinfo.input_components = 3;
GST_DEBUG (0,"gst_jpegenc_resync: wdith %d, height %d", width, height);
jpeg_set_defaults(&jpegenc->cinfo);
jpegenc->cinfo.dct_method = JDCT_FASTEST;
/*jpegenc->cinfo.dct_method = JDCT_DEFAULT; */
/*jpegenc->cinfo.smoothing_factor = 10; */
jpeg_set_quality(&jpegenc->cinfo, 85, TRUE);
/*
switch (jpegenc->format) {
case GST_COLORSPACE_RGB24:
size = 3;
GST_DEBUG (0,"gst_jpegenc_resync: setting format to RGB24");
jpegenc->cinfo.in_color_space = JCS_RGB;
jpegenc->cinfo.raw_data_in = FALSE;
break;
case GST_COLORSPACE_YUV420P:
size = 2;
jpegenc->cinfo.raw_data_in = TRUE;
jpegenc->cinfo.in_color_space = JCS_YCbCr;
GST_DEBUG (0,"gst_jpegenc_resync: setting format to YUV420P");
jpegenc->cinfo.comp_info[0].h_samp_factor = 2;
jpegenc->cinfo.comp_info[0].v_samp_factor = 2;
jpegenc->cinfo.comp_info[1].h_samp_factor = 1;
jpegenc->cinfo.comp_info[1].v_samp_factor = 1;
jpegenc->cinfo.comp_info[2].h_samp_factor = 1;
jpegenc->cinfo.comp_info[2].v_samp_factor = 1;
if (height != -1) {
jpegenc->line[0] = g_realloc(jpegenc->line[0], height*sizeof(char*));
jpegenc->line[1] = g_realloc(jpegenc->line[1], height*sizeof(char*)/2);
jpegenc->line[2] = g_realloc(jpegenc->line[2], height*sizeof(char*)/2);
}
GST_DEBUG (0,"gst_jpegenc_resync: setting format done");
break;
default:
printf("gst_jpegenc_resync: unsupported colorspace, using RGB\n");
size = 3;
jpegenc->cinfo.in_color_space = JCS_RGB;
break;
}
*/
jpegenc->bufsize = jpegenc->width*jpegenc->height*size;
jpegenc->row_stride = width * size;
jpeg_suppress_tables(&jpegenc->cinfo, TRUE);
jpegenc->buffer = NULL;
GST_DEBUG (0,"gst_jpegenc_resync: resync done");
}
static GstBuffer*
gst_jpegenc_get (GstPad *pad)
{
GstJpegEnc *jpegenc;
GstBuffer *newbuf;
GST_DEBUG (0,"gst_jpegenc_chain: pull buffer");
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
jpegenc = GST_JPEGENC (GST_OBJECT_PARENT (pad));
if (jpegenc->buffer == NULL || GST_BUFFER_REFCOUNT_VALUE(jpegenc->buffer) != 1) {
if (jpegenc->buffer) gst_buffer_unref(jpegenc->buffer);
GST_DEBUG (0,"gst_jpegenc_chain: new buffer");
newbuf = jpegenc->buffer = gst_buffer_new();
GST_BUFFER_DATA(newbuf) = g_malloc(jpegenc->bufsize);
GST_BUFFER_SIZE(newbuf) = jpegenc->bufsize;
}
gst_buffer_ref(jpegenc->buffer);
return jpegenc->buffer;
}
static void
gst_jpegenc_chain (GstPad *pad, GstBuffer *buf)
{
GstJpegEnc *jpegenc;
guchar *data, *outdata;
gulong size, outsize;
GstBuffer *outbuf;
/* GstMeta *meta; */
guint height, width, width2;
guchar *base[3];
gint i,j, k;
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)); */
/*usleep(10000); */
jpegenc = GST_JPEGENC (GST_OBJECT_PARENT (pad));
data = GST_BUFFER_DATA(buf);
size = GST_BUFFER_SIZE(buf);
GST_DEBUG (0,"gst_jpegenc_chain: got buffer of %ld bytes in '%s'",size,
GST_OBJECT_NAME (jpegenc));
outbuf = gst_buffer_new();
outsize = GST_BUFFER_SIZE(outbuf) = jpegenc->bufsize;
outdata = GST_BUFFER_DATA(outbuf) = g_malloc(outsize);
GST_BUFFER_TIMESTAMP(outbuf) = GST_BUFFER_TIMESTAMP(buf);
width = jpegenc->width;
height = jpegenc->height;
base[0] = data;
base[1] = base[0]+width*height;
base[2] = base[1]+width*height/4;
jpegenc->jdest.next_output_byte = outdata;
jpegenc->jdest.free_in_buffer = outsize;
jpeg_start_compress(&jpegenc->cinfo, TRUE);
width2 = width>>1;
GST_DEBUG (0,"gst_jpegdec_chain: compressing");
for (i = 0; i < height; i += 2*DCTSIZE) {
for (j=0, k=0; j<2*DCTSIZE;j+=2, k++) {
jpegenc->line[0][j] = base[0]; base[0] += width;
jpegenc->line[0][j+1] = base[0]; base[0] += width;
jpegenc->line[1][k] = base[1]; base[1] += width2;
jpegenc->line[2][k] = base[2]; base[2] += width2;
}
jpeg_write_raw_data(&jpegenc->cinfo, jpegenc->line, 2*DCTSIZE);
}
jpeg_finish_compress(&jpegenc->cinfo);
GST_DEBUG (0,"gst_jpegdec_chain: compressing done");
GST_BUFFER_SIZE(outbuf) = (((outsize - jpegenc->jdest.free_in_buffer)+3)&~3);
gst_pad_push(jpegenc->srcpad, outbuf);
g_signal_emit(G_OBJECT(jpegenc),gst_jpegenc_signals[FRAME_ENCODED], 0);
gst_buffer_unref(buf);
}