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709 lines
17 KiB
C
709 lines
17 KiB
C
/* Smoke codec
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* Copyright (C) <2004> Wim Taymans <wim@fluendo.com>
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*
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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/* this is a hack hack hack to get around jpeglib header bugs... */
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#ifdef HAVE_STDLIB_H
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# undef HAVE_STDLIB_H
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#endif
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#include <jpeglib.h>
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#include "smokecodec.h"
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#include "smokeformat.h"
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#include <gst/gstinfo.h>
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struct _SmokeCodecInfo
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{
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unsigned int width;
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unsigned int height;
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unsigned int fps_num;
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unsigned int fps_denom;
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unsigned int minquality;
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unsigned int maxquality;
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unsigned int bitrate;
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unsigned int threshold;
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unsigned int refdec;
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unsigned char **line[3];
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unsigned char *compbuf[3];
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struct jpeg_error_mgr jerr;
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struct jpeg_compress_struct cinfo;
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struct jpeg_destination_mgr jdest;
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struct jpeg_decompress_struct dinfo;
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struct jpeg_source_mgr jsrc;
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int need_keyframe;
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unsigned char *reference;
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};
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static void
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smokecodec_init_destination (j_compress_ptr cinfo)
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{
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}
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static boolean
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smokecodec_flush_destination (j_compress_ptr cinfo)
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{
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return 1;
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}
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static void
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smokecodec_term_destination (j_compress_ptr cinfo)
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{
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}
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static void
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smokecodec_init_source (j_decompress_ptr cinfo)
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{
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}
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static boolean
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smokecodec_fill_input_buffer (j_decompress_ptr cinfo)
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{
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return 1;
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}
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static void
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smokecodec_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
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{
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}
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static boolean
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smokecodec_resync_to_restart (j_decompress_ptr cinfo, int desired)
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{
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return 1;
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}
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static void
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smokecodec_term_source (j_decompress_ptr cinfo)
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{
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}
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int
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smokecodec_encode_new (SmokeCodecInfo ** info,
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const unsigned int width,
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const unsigned int height,
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const unsigned int fps_num, const unsigned int fps_denom)
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{
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SmokeCodecInfo *newinfo;
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int i, j;
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unsigned char *base[3];
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if (!info)
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return SMOKECODEC_NULLPTR;
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if ((width & 0xf) || (height & 0xf))
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return SMOKECODEC_WRONGSIZE;
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newinfo = malloc (sizeof (SmokeCodecInfo));
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if (!newinfo) {
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return SMOKECODEC_NOMEM;
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}
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newinfo->width = width;
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newinfo->height = height;
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newinfo->fps_num = fps_num;
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newinfo->fps_denom = fps_denom;
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/* setup jpeglib */
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memset (&newinfo->cinfo, 0, sizeof (newinfo->cinfo));
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memset (&newinfo->jerr, 0, sizeof (newinfo->jerr));
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newinfo->cinfo.err = jpeg_std_error (&newinfo->jerr);
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jpeg_create_compress (&newinfo->cinfo);
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newinfo->cinfo.input_components = 3;
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jpeg_set_defaults (&newinfo->cinfo);
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newinfo->cinfo.dct_method = JDCT_FASTEST;
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/* prepare for raw input */
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#if JPEG_LIB_VERSION >= 70
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newinfo->cinfo.do_fancy_downsampling = FALSE;
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#endif
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newinfo->cinfo.raw_data_in = TRUE;
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newinfo->cinfo.in_color_space = JCS_YCbCr;
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newinfo->cinfo.comp_info[0].h_samp_factor = 2;
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newinfo->cinfo.comp_info[0].v_samp_factor = 2;
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newinfo->cinfo.comp_info[1].h_samp_factor = 1;
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newinfo->cinfo.comp_info[1].v_samp_factor = 1;
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newinfo->cinfo.comp_info[2].h_samp_factor = 1;
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newinfo->cinfo.comp_info[2].v_samp_factor = 1;
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newinfo->line[0] = malloc (DCTSIZE * 2 * sizeof (char *));
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newinfo->line[1] = malloc (DCTSIZE * sizeof (char *));
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newinfo->line[2] = malloc (DCTSIZE * sizeof (char *));
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base[0] = newinfo->compbuf[0] = malloc (256 * 2 * DCTSIZE * 2 * DCTSIZE);
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base[1] = newinfo->compbuf[1] = malloc (256 * DCTSIZE * DCTSIZE);
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base[2] = newinfo->compbuf[2] = malloc (256 * DCTSIZE * DCTSIZE);
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for (i = 0, j = 0; i < 2 * DCTSIZE; i += 2, j++) {
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newinfo->line[0][i] = base[0];
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base[0] += 2 * DCTSIZE * 256;
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newinfo->line[0][i + 1] = base[0];
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base[0] += 2 * DCTSIZE * 256;
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newinfo->line[1][j] = base[1];
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base[1] += DCTSIZE * 256;
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newinfo->line[2][j] = base[2];
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base[2] += DCTSIZE * 256;
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}
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newinfo->jdest.init_destination = smokecodec_init_destination;
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newinfo->jdest.empty_output_buffer = smokecodec_flush_destination;
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newinfo->jdest.term_destination = smokecodec_term_destination;
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newinfo->cinfo.dest = &newinfo->jdest;
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jpeg_suppress_tables (&newinfo->cinfo, FALSE);
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memset (&newinfo->dinfo, 0, sizeof (newinfo->dinfo));
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newinfo->dinfo.err = jpeg_std_error (&newinfo->jerr);
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jpeg_create_decompress (&newinfo->dinfo);
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newinfo->jsrc.init_source = smokecodec_init_source;
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newinfo->jsrc.fill_input_buffer = smokecodec_fill_input_buffer;
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newinfo->jsrc.skip_input_data = smokecodec_skip_input_data;
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newinfo->jsrc.resync_to_restart = smokecodec_resync_to_restart;
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newinfo->jsrc.term_source = smokecodec_term_source;
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newinfo->dinfo.src = &newinfo->jsrc;
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newinfo->need_keyframe = 1;
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newinfo->threshold = 4000;
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newinfo->minquality = 10;
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newinfo->maxquality = 85;
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newinfo->reference = malloc (3 * (width * height) / 2);
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newinfo->refdec = 0;
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*info = newinfo;
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return SMOKECODEC_OK;
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}
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int
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smokecodec_decode_new (SmokeCodecInfo ** info)
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{
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return smokecodec_encode_new (info, 16, 16, 1, 1);
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}
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int
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smokecodec_info_free (SmokeCodecInfo * info)
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{
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free (info->line[0]);
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free (info->line[1]);
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free (info->line[2]);
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free (info->compbuf[0]);
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free (info->compbuf[1]);
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free (info->compbuf[2]);
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free (info->reference);
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jpeg_destroy_compress (&info->cinfo);
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jpeg_destroy_decompress (&info->dinfo);
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free (info);
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return SMOKECODEC_OK;
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}
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SmokeCodecResult
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smokecodec_set_quality (SmokeCodecInfo * info,
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const unsigned int min, const unsigned int max)
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{
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info->minquality = min;
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info->maxquality = max;
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return SMOKECODEC_OK;
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}
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SmokeCodecResult
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smokecodec_get_quality (SmokeCodecInfo * info,
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unsigned int *min, unsigned int *max)
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{
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*min = info->minquality;
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*max = info->maxquality;
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return SMOKECODEC_OK;
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}
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SmokeCodecResult
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smokecodec_set_threshold (SmokeCodecInfo * info, const unsigned int threshold)
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{
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info->threshold = threshold;
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return SMOKECODEC_OK;
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}
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SmokeCodecResult
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smokecodec_get_threshold (SmokeCodecInfo * info, unsigned int *threshold)
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{
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*threshold = info->threshold;
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return SMOKECODEC_OK;
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}
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SmokeCodecResult
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smokecodec_set_bitrate (SmokeCodecInfo * info, const unsigned int bitrate)
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{
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info->bitrate = bitrate;
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return SMOKECODEC_OK;
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}
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SmokeCodecResult
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smokecodec_get_bitrate (SmokeCodecInfo * info, unsigned int *bitrate)
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{
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*bitrate = info->bitrate;
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return SMOKECODEC_OK;
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}
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static void
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find_best_size (int blocks, unsigned int *width, unsigned int *height)
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{
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int sqchng;
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int w, h;
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int best, bestw;
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int free;
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sqchng = ceil (sqrt (blocks));
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w = sqchng;
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h = sqchng;
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GST_DEBUG ("guess: %d %d", w, h);
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free = w * h - blocks;
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best = free;
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bestw = w;
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while (w < 256) {
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GST_DEBUG ("current: %d %d", w, h);
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if (free < best) {
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best = free;
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bestw = w;
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if (free == 0)
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break;
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}
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// if we cannot reduce the height, increase width
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if (free < w) {
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w++;
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free += h;
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}
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// reduce height while possible
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while (free >= w) {
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h--;
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free -= w;
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}
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}
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*width = bestw;
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*height = (blocks + best) / bestw;
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}
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static int
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abs_diff (const unsigned char *in1, const unsigned char *in2, const int stride)
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{
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int s;
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int i, j, diff;
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s = 0;
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for (i = 0; i < 2 * DCTSIZE; i++) {
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for (j = 0; j < 2 * DCTSIZE; j++) {
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diff = in1[j] - in2[j];
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s += diff * diff;
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}
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in1 += stride;
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in2 += stride;
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}
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return s;
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}
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static void
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put (const unsigned char *src, unsigned char *dest,
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int width, int height, int srcstride, int deststride)
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{
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int i, j;
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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dest[j] = src[j];
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}
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src += srcstride;
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dest += deststride;
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}
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}
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/* encoding */
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SmokeCodecResult
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smokecodec_encode_id (SmokeCodecInfo * info,
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unsigned char *out, unsigned int *outsize)
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{
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int i;
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*out++ = SMOKECODEC_TYPE_ID;
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for (i = 0; i < strlen (SMOKECODEC_ID_STRING); i++) {
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*out++ = SMOKECODEC_ID_STRING[i];
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}
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*out++ = 0;
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*out++ = 1;
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*out++ = 0;
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*outsize = 9;
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return SMOKECODEC_OK;
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}
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SmokeCodecResult
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smokecodec_encode (SmokeCodecInfo * info,
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const unsigned char *in,
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SmokeCodecFlags flags, unsigned char *out, unsigned int *outsize)
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{
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unsigned int i, j, s;
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const unsigned char *ip;
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unsigned char *op;
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unsigned int blocks, encoding;
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unsigned int size;
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unsigned int width, height;
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unsigned int blocks_w, blocks_h;
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unsigned int threshold;
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unsigned int max;
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if (info->need_keyframe) {
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flags |= SMOKECODEC_KEYFRAME;
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info->need_keyframe = 0;
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}
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if (flags & SMOKECODEC_KEYFRAME)
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threshold = 0;
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else
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threshold = info->threshold;
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ip = in;
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op = info->reference;
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width = info->width;
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height = info->height;
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blocks_w = width / (DCTSIZE * 2);
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blocks_h = height / (DCTSIZE * 2);
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max = blocks_w * blocks_h;
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out[IDX_TYPE] = SMOKECODEC_TYPE_DATA;
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#define STORE16(var, pos, x) \
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var[pos] = (x >> 8); \
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var[pos+1] = (x & 0xff);
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#define STORE32(var, pos, x) \
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var[pos] = ((x >> 24) & 0xff); \
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var[pos+1] = ((x >> 16) & 0xff); \
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var[pos+2] = ((x >> 8) & 0xff); \
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var[pos+3] = (x & 0xff);
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/* write dimension */
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STORE16 (out, IDX_WIDTH, width);
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STORE16 (out, IDX_HEIGHT, height);
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/* write framerate */
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STORE32 (out, IDX_FPS_NUM, info->fps_num);
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STORE32 (out, IDX_FPS_DENOM, info->fps_denom);
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if (!(flags & SMOKECODEC_KEYFRAME)) {
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int block = 0;
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blocks = 0;
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for (i = 0; i < height; i += 2 * DCTSIZE) {
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for (j = 0; j < width; j += 2 * DCTSIZE) {
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s = abs_diff (ip, op, width);
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if (s >= threshold) {
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STORE16 (out, blocks * 2 + IDX_BLOCKS, block);
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blocks++;
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}
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ip += 2 * DCTSIZE;
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op += 2 * DCTSIZE;
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block++;
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}
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ip += (2 * DCTSIZE - 1) * width;
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op += (2 * DCTSIZE - 1) * width;
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}
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if (blocks == max) {
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flags |= SMOKECODEC_KEYFRAME;
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blocks = 0;
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encoding = max;
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} else {
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encoding = blocks;
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}
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} else {
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blocks = 0;
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encoding = max;
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}
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STORE16 (out, IDX_NUM_BLOCKS, blocks);
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out[IDX_FLAGS] = (flags & 0xff);
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GST_DEBUG ("blocks %d, encoding %d", blocks, encoding);
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info->jdest.next_output_byte = &out[blocks * 2 + OFFS_PICT];
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info->jdest.free_in_buffer = (*outsize) - OFFS_PICT;
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if (encoding > 0) {
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int quality;
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if (!(flags & SMOKECODEC_KEYFRAME))
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find_best_size (encoding, &blocks_w, &blocks_h);
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GST_DEBUG ("best: %d %d", blocks_w, blocks_h);
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info->cinfo.image_width = blocks_w * DCTSIZE * 2;
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info->cinfo.image_height = blocks_h * DCTSIZE * 2;
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if (flags & SMOKECODEC_KEYFRAME) {
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quality = (info->maxquality * 60) / 100;
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} else {
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quality =
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info->maxquality - ((info->maxquality -
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info->minquality) * blocks) / max;
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}
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GST_DEBUG ("set q %d %d %d", quality, encoding, max);
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jpeg_set_quality (&info->cinfo, quality, TRUE);
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GST_DEBUG ("start");
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jpeg_start_compress (&info->cinfo, TRUE);
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for (i = 0; i < encoding; i++) {
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int pos;
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int x, y;
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if (flags & SMOKECODEC_KEYFRAME)
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pos = i;
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else
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pos = (out[i * 2 + IDX_BLOCKS] << 8) | (out[i * 2 + IDX_BLOCKS + 1]);
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x = pos % (width / (DCTSIZE * 2));
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y = pos / (width / (DCTSIZE * 2));
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ip = in + (x * (DCTSIZE * 2)) + (y * (DCTSIZE * 2) * width);
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op = info->compbuf[0] + (i % blocks_w) * (DCTSIZE * 2);
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put (ip, op, 2 * DCTSIZE, 2 * DCTSIZE, width, 256 * (DCTSIZE * 2));
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ip = in + width * height + (x * DCTSIZE) + (y * DCTSIZE * width / 2);
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op = info->compbuf[1] + (i % blocks_w) * (DCTSIZE);
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put (ip, op, DCTSIZE, DCTSIZE, width / 2, 256 * DCTSIZE);
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ip = in + 5 * (width * height) / 4 + (x * DCTSIZE) +
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(y * DCTSIZE * width / 2);
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op = info->compbuf[2] + (i % blocks_w) * (DCTSIZE);
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put (ip, op, DCTSIZE, DCTSIZE, width / 2, 256 * DCTSIZE);
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if ((i % blocks_w) == (blocks_w - 1) || (i == encoding - 1)) {
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GST_DEBUG ("write %d", pos);
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jpeg_write_raw_data (&info->cinfo, info->line, 2 * DCTSIZE);
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}
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}
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GST_DEBUG ("finish");
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jpeg_finish_compress (&info->cinfo);
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}
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size = ((((*outsize) - OFFS_PICT - info->jdest.free_in_buffer) + 3) & ~3);
|
|
STORE16 (out, IDX_SIZE, size);
|
|
|
|
*outsize = size + blocks * 2 + OFFS_PICT;
|
|
GST_DEBUG ("outsize %d", *outsize);
|
|
|
|
// and decode in reference frame again
|
|
if (info->refdec) {
|
|
smokecodec_decode (info, out, *outsize, info->reference);
|
|
} else {
|
|
memcpy (info->reference, in, 3 * (width * height) / 2);
|
|
}
|
|
|
|
return SMOKECODEC_OK;
|
|
}
|
|
|
|
SmokeCodecResult
|
|
smokecodec_parse_id (SmokeCodecInfo * info,
|
|
const unsigned char *in, const unsigned int insize)
|
|
{
|
|
int i;
|
|
|
|
if (insize < 4 + strlen (SMOKECODEC_ID_STRING)) {
|
|
return SMOKECODEC_WRONGVERSION;
|
|
}
|
|
|
|
if (*in++ != SMOKECODEC_TYPE_ID)
|
|
return SMOKECODEC_ERROR;
|
|
|
|
for (i = 0; i < strlen (SMOKECODEC_ID_STRING); i++) {
|
|
if (*in++ != SMOKECODEC_ID_STRING[i])
|
|
return SMOKECODEC_ERROR;
|
|
}
|
|
if (*in++ != 0 || *in++ != 1 || *in++ != 0)
|
|
return SMOKECODEC_ERROR;
|
|
|
|
return SMOKECODEC_OK;
|
|
}
|
|
|
|
#define READ16(var, pos, x) \
|
|
x = var[pos]<<8 | var[pos+1];
|
|
|
|
#define READ32(var, pos, x) \
|
|
x = var[pos]<<24 | var[pos+1]<<16 | \
|
|
var[pos+2]<<8 | var[pos+3];
|
|
|
|
/* decoding */
|
|
SmokeCodecResult
|
|
smokecodec_parse_header (SmokeCodecInfo * info,
|
|
const unsigned char *in,
|
|
const unsigned int insize,
|
|
SmokeCodecFlags * flags,
|
|
unsigned int *width,
|
|
unsigned int *height, unsigned int *fps_num, unsigned int *fps_denom)
|
|
{
|
|
|
|
READ16 (in, IDX_WIDTH, *width);
|
|
READ16 (in, IDX_HEIGHT, *height);
|
|
*flags = in[IDX_FLAGS];
|
|
READ32 (in, IDX_FPS_NUM, *fps_num);
|
|
READ32 (in, IDX_FPS_DENOM, *fps_denom);
|
|
|
|
if (info->width != *width ||
|
|
info->height != *height ||
|
|
info->fps_num != *fps_num || info->fps_denom != *fps_denom) {
|
|
GST_DEBUG ("new width: %d %d", *width, *height);
|
|
|
|
info->reference = realloc (info->reference, 3 * ((*width) * (*height)) / 2);
|
|
info->width = *width;
|
|
info->height = *height;
|
|
info->fps_num = *fps_num;
|
|
info->fps_denom = *fps_denom;
|
|
}
|
|
|
|
return SMOKECODEC_OK;
|
|
}
|
|
|
|
SmokeCodecResult
|
|
smokecodec_decode (SmokeCodecInfo * info,
|
|
const unsigned char *in, const unsigned int insize, unsigned char *out)
|
|
{
|
|
unsigned int width, height;
|
|
unsigned int fps_num, fps_denom;
|
|
SmokeCodecFlags flags;
|
|
int i, j;
|
|
int blocks_w, blocks_h;
|
|
int blockptr;
|
|
int blocks, decoding;
|
|
const unsigned char *ip;
|
|
unsigned char *op;
|
|
int res;
|
|
|
|
smokecodec_parse_header (info, in, insize, &flags, &width, &height,
|
|
&fps_num, &fps_denom);
|
|
|
|
READ16 (in, IDX_NUM_BLOCKS, blocks);
|
|
GST_DEBUG ("blocks %d", blocks);
|
|
|
|
if (flags & SMOKECODEC_KEYFRAME)
|
|
decoding = width / (DCTSIZE * 2) * height / (DCTSIZE * 2);
|
|
else
|
|
decoding = blocks;
|
|
|
|
if (decoding > 0) {
|
|
info->jsrc.next_input_byte = &in[blocks * 2 + OFFS_PICT];
|
|
info->jsrc.bytes_in_buffer = insize - (blocks * 2 + OFFS_PICT);
|
|
|
|
GST_DEBUG ("header %02x %d", in[blocks * 2 + OFFS_PICT], insize);
|
|
res = jpeg_read_header (&info->dinfo, TRUE);
|
|
GST_DEBUG ("header %d %d %d", res, info->dinfo.image_width,
|
|
info->dinfo.image_height);
|
|
|
|
blocks_w = info->dinfo.image_width / (2 * DCTSIZE);
|
|
blocks_h = info->dinfo.image_height / (2 * DCTSIZE);
|
|
|
|
info->dinfo.output_width = info->dinfo.image_width;
|
|
info->dinfo.output_height = info->dinfo.image_height;
|
|
|
|
GST_DEBUG ("start");
|
|
info->dinfo.do_fancy_upsampling = FALSE;
|
|
info->dinfo.do_block_smoothing = FALSE;
|
|
info->dinfo.out_color_space = JCS_YCbCr;
|
|
info->dinfo.dct_method = JDCT_IFAST;
|
|
info->dinfo.raw_data_out = TRUE;
|
|
jpeg_start_decompress (&info->dinfo);
|
|
|
|
blockptr = 0;
|
|
|
|
for (i = 0; i < blocks_h; i++) {
|
|
GST_DEBUG ("read");
|
|
jpeg_read_raw_data (&info->dinfo, info->line, 2 * DCTSIZE);
|
|
|
|
GST_DEBUG ("copy %d", blocks_w);
|
|
for (j = 0; j < blocks_w; j++) {
|
|
int pos;
|
|
int x, y;
|
|
|
|
if (flags & SMOKECODEC_KEYFRAME)
|
|
pos = blockptr;
|
|
else
|
|
READ16 (in, blockptr * 2 + IDX_BLOCKS, pos);
|
|
|
|
x = pos % (width / (DCTSIZE * 2));
|
|
y = pos / (width / (DCTSIZE * 2));
|
|
|
|
GST_DEBUG ("block %d %d %d", pos, x, y);
|
|
|
|
ip = info->compbuf[0] + j * (DCTSIZE * 2);
|
|
op = info->reference + (x * (DCTSIZE * 2)) +
|
|
(y * (DCTSIZE * 2) * width);
|
|
put (ip, op, 2 * DCTSIZE, 2 * DCTSIZE, 256 * (DCTSIZE * 2), width);
|
|
|
|
ip = info->compbuf[1] + j * (DCTSIZE);
|
|
op = info->reference + width * height + (x * DCTSIZE) +
|
|
(y * DCTSIZE * width / 2);
|
|
put (ip, op, DCTSIZE, DCTSIZE, 256 * DCTSIZE, width / 2);
|
|
|
|
ip = info->compbuf[2] + j * (DCTSIZE);
|
|
op = info->reference + 5 * (width * height) / 4 + (x * DCTSIZE) +
|
|
(y * DCTSIZE * width / 2);
|
|
put (ip, op, DCTSIZE, DCTSIZE, 256 * DCTSIZE, width / 2);
|
|
|
|
GST_DEBUG ("block done %d %d %d", pos, x, y);
|
|
blockptr++;
|
|
if (blockptr >= decoding)
|
|
break;
|
|
}
|
|
}
|
|
GST_DEBUG ("finish");
|
|
jpeg_finish_decompress (&info->dinfo);
|
|
}
|
|
|
|
GST_DEBUG ("copy");
|
|
if (out != info->reference)
|
|
memcpy (out, info->reference, 3 * (width * height) / 2);
|
|
GST_DEBUG ("copy done");
|
|
|
|
return SMOKECODEC_OK;
|
|
}
|