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/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
Copyright (C) 2010 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "spice-client.h"
#include "spice-common.h"
#include "spice-channel-priv.h"
#include "channel-display-priv.h"
static void mjpeg_src_init(struct jpeg_decompress_struct *cinfo)
{
display_stream *st = SPICE_CONTAINEROF(cinfo->src, display_stream, mjpeg_src);
uint8_t *data;
cinfo->src->bytes_in_buffer = stream_get_current_frame(st, &data);
cinfo->src->next_input_byte = data;
}
static boolean mjpeg_src_fill(struct jpeg_decompress_struct *cinfo)
{
g_critical("need more input data");
return 0;
}
static void mjpeg_src_skip(struct jpeg_decompress_struct *cinfo,
long num_bytes)
{
cinfo->src->next_input_byte += num_bytes;
}
static void mjpeg_src_term(struct jpeg_decompress_struct *cinfo)
{
/* nothing */
}
G_GNUC_INTERNAL
void stream_mjpeg_init(display_stream *st)
{
st->mjpeg_cinfo.err = jpeg_std_error(&st->mjpeg_jerr);
jpeg_create_decompress(&st->mjpeg_cinfo);
st->mjpeg_src.init_source = mjpeg_src_init;
st->mjpeg_src.fill_input_buffer = mjpeg_src_fill;
st->mjpeg_src.skip_input_data = mjpeg_src_skip;
st->mjpeg_src.resync_to_restart = jpeg_resync_to_restart;
st->mjpeg_src.term_source = mjpeg_src_term;
st->mjpeg_cinfo.src = &st->mjpeg_src;
}
G_GNUC_INTERNAL
void stream_mjpeg_data(display_stream *st)
{
gboolean back_compat = st->channel->priv->peer_hdr.major_version == 1;
int width;
int height;
uint8_t *dest;
uint8_t *lines[4];
stream_get_dimensions(st, &width, &height);
dest = malloc(width * height * 4);
if (st->out_frame) {
free(st->out_frame);
}
st->out_frame = dest;
jpeg_read_header(&st->mjpeg_cinfo, 1);
#ifdef JCS_EXTENSIONS
// requires jpeg-turbo
if (back_compat)
st->mjpeg_cinfo.out_color_space = JCS_EXT_RGBX;
else
st->mjpeg_cinfo.out_color_space = JCS_EXT_BGRX;
#else
#warning "You should consider building with libjpeg-turbo"
st->mjpeg_cinfo.out_color_space = JCS_RGB;
#endif
#ifndef SPICE_QUALITY
st->mjpeg_cinfo.dct_method = JDCT_IFAST;
st->mjpeg_cinfo.do_fancy_upsampling = FALSE;
st->mjpeg_cinfo.do_block_smoothing = FALSE;
st->mjpeg_cinfo.dither_mode = JDITHER_ORDERED;
#endif
// TODO: in theory should check cinfo.output_height match with our height
jpeg_start_decompress(&st->mjpeg_cinfo);
/* rec_outbuf_height is the recommended size of the output buffer we
* pass to libjpeg for optimum performance
*/
if (st->mjpeg_cinfo.rec_outbuf_height > G_N_ELEMENTS(lines)) {
jpeg_abort_decompress(&st->mjpeg_cinfo);
g_return_if_reached();
}
while (st->mjpeg_cinfo.output_scanline < st->mjpeg_cinfo.output_height) {
/* only used when JCS_EXTENSIONS is undefined */
G_GNUC_UNUSED unsigned int lines_read;
for (unsigned int j = 0; j < st->mjpeg_cinfo.rec_outbuf_height; j++) {
lines[j] = dest;
#ifdef JCS_EXTENSIONS
dest += 4 * width;
#else
dest += 3 * width;
#endif
}
lines_read = jpeg_read_scanlines(&st->mjpeg_cinfo, lines,
st->mjpeg_cinfo.rec_outbuf_height);
#ifndef JCS_EXTENSIONS
{
uint8_t *s = lines[0];
uint32_t *d = (uint32_t *)s;
if (back_compat) {
for (unsigned int j = lines_read * width; j > 0; ) {
j -= 1; // reverse order, bad for cache?
d[j] = s[j * 3 + 0] |
s[j * 3 + 1] << 8 |
s[j * 3 + 2] << 16;
}
} else {
for (unsigned int j = lines_read * width; j > 0; ) {
j -= 1; // reverse order, bad for cache?
d[j] = s[j * 3 + 0] << 16 |
s[j * 3 + 1] << 8 |
s[j * 3 + 2];
}
}
}
#endif
dest = &st->out_frame[st->mjpeg_cinfo.output_scanline * width * 4];
}
jpeg_finish_decompress(&st->mjpeg_cinfo);
}
G_GNUC_INTERNAL
void stream_mjpeg_cleanup(display_stream *st)
{
jpeg_destroy_decompress(&st->mjpeg_cinfo);
free(st->out_frame);
st->out_frame = NULL;
}
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