mirror of
https://gitlab.uni-freiburg.de/opensourcevdi/spice
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78c1465ed3
When using config.h, it must be the very first include in all source files since it contains #define that may change the compilation process (eg libc structure layout changes when it's used to enable large file support on 32 bit x86 archs). This commit adds it at the beginning of all .c and .cpp files
130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/*
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Copyright (C) 2009 Red Hat, Inc.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "red_common.h"
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#include "mjpeg_encoder.h"
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#include <jpeglib.h>
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struct MJpegEncoder {
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int width;
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int height;
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int stride;
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uint8_t *frame;
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int first_frame;
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int quality;
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struct jpeg_compress_struct cinfo;
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struct jpeg_error_mgr jerr;
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};
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MJpegEncoder *mjpeg_encoder_new(int width, int height)
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{
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MJpegEncoder *enc;
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enc = spice_new0(MJpegEncoder, 1);
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enc->first_frame = TRUE;
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enc->width = width;
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enc->height = height;
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enc->stride = width * 3;
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enc->quality = 70;
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if (enc->stride < width) {
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abort();
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}
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enc->frame = spice_malloc_n(enc->stride, height);
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enc->cinfo.err = jpeg_std_error(&enc->jerr);
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jpeg_create_compress(&enc->cinfo);
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return enc;
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}
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void mjpeg_encoder_destroy(MJpegEncoder *encoder)
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{
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jpeg_destroy_compress(&encoder->cinfo);
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free(encoder->frame);
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free(encoder);
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}
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uint8_t *mjpeg_encoder_get_frame(MJpegEncoder *encoder)
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{
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return encoder->frame;
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}
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size_t mjpeg_encoder_get_frame_stride(MJpegEncoder *encoder)
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{
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return encoder->stride;
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}
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void init_destination(j_compress_ptr cinfo)
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{
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}
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boolean empty_output_buffer(j_compress_ptr cinfo)
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{
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return FALSE;
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}
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void term_destination(j_compress_ptr cinfo)
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{
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}
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int mjpeg_encoder_encode_frame(MJpegEncoder *encoder,
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uint8_t *buffer, size_t buffer_len)
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{
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struct jpeg_destination_mgr destmgr;
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uint8_t *frame;
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int n;
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destmgr.next_output_byte = buffer;
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destmgr.free_in_buffer = buffer_len;
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destmgr.init_destination = init_destination;
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destmgr.empty_output_buffer = empty_output_buffer;
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destmgr.term_destination = term_destination;
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encoder->cinfo.dest = &destmgr;
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encoder->cinfo.image_width = encoder->width;
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encoder->cinfo.image_height = encoder->height;
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encoder->cinfo.input_components = 3;
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encoder->cinfo.in_color_space = JCS_RGB;
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jpeg_set_defaults(&encoder->cinfo);
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encoder->cinfo.dct_method = JDCT_IFAST;
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jpeg_set_quality(&encoder->cinfo, encoder->quality, TRUE);
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jpeg_start_compress(&encoder->cinfo, encoder->first_frame);
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frame = encoder->frame;
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while (encoder->cinfo.next_scanline < encoder->cinfo.image_height) {
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n = jpeg_write_scanlines(&encoder->cinfo, &frame, 1);
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if (n == 0) { /* Not enough space */
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jpeg_abort_compress(&encoder->cinfo);
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return 0;
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}
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frame += encoder->stride;
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}
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jpeg_finish_compress(&encoder->cinfo);
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encoder->first_frame = FALSE;
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return destmgr.next_output_byte - buffer;
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}
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