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https://github.com/librempeg/librempeg
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Initial version of the a64 (multicolor charset) codec
Originally committed as revision 24873 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Tobias Bindhammer
parent
620918e4bf
commit
7bf7833fb7
50
libavcodec/a64enc.h
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50
libavcodec/a64enc.h
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/*
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* a64 video encoder - basic headers
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* Copyright (c) 2009 Tobias Bindhammer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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*
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* FFmpeg 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* a64 video encoder - basic headers
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*/
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#ifndef AVCODEC_A64ENC_H
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#define AVCODEC_A64ENC_H
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#include "libavutil/lfg.h"
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#include "avcodec.h"
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#define C64XRES 320
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#define C64YRES 200
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typedef struct A64Context {
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/* general variables */
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AVFrame picture;
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/* variables for multicolor modes */
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AVLFG randctx;
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int mc_lifetime;
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int mc_use_5col;
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int mc_frame_counter;
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int *mc_meta_charset;
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int *mc_charmap;
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int *mc_best_cb;
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} A64Context;
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#endif /* AVCODEC_A64ENC_H */
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248
libavcodec/a64multienc.c
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248
libavcodec/a64multienc.c
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/*
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* a64 video encoder - multicolor modes
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* Copyright (c) 2009 Tobias Bindhammer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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*
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* FFmpeg 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* a64 video encoder - multicolor modes
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*/
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#include "a64enc.h"
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#include "a64tables.h"
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#include "elbg.h"
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#include "libavutil/intreadwrite.h"
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#define DITHERSTEPS 8
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static void to_meta_with_crop(AVCodecContext *avctx, AVFrame *p, int *dest)
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{
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int blockx, blocky, x, y;
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int luma = 0;
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int height = FFMIN(avctx->height,C64YRES);
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int width = FFMIN(avctx->width ,C64XRES);
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uint8_t *src = p->data[0];
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for (blocky = 0; blocky < height; blocky += 8) {
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for (blockx = 0; blockx < C64XRES; blockx += 8) {
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for (y = blocky; y < blocky+8 && y < height; y++) {
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for (x = blockx; x < blockx+8 && x < C64XRES; x += 2) {
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if(x < width) {
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/* build average over 2 pixels */
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luma = (src[(x + 0 + y * p->linesize[0])] +
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src[(x + 1 + y * p->linesize[0])]) / 2;
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/* write blocks as linear data now so they are suitable for elbg */
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dest[0] = luma;
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}
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dest++;
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}
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}
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}
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}
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}
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static void render_charset(AVCodecContext *avctx, uint8_t *charset,
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uint8_t *colrammap)
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{
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A64Context *c = avctx->priv_data;
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uint8_t row1;
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int charpos, x, y;
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int pix;
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int dither;
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int index1, index2;
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int lowdiff, highdiff;
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int maxindex = c->mc_use_5col + 3;
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int maxsteps = DITHERSTEPS * maxindex + 1;
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int *best_cb = c->mc_best_cb;
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/* now reduce colors first */
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for (x = 0; x < 256 * 32; x++) best_cb[x] = best_cb[x] * maxsteps / 255;
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/* and render charset */
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for (charpos = 0; charpos < 256; charpos++) {
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lowdiff = 0;
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highdiff = 0;
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for (y = 0; y < 8; y++) {
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row1 = 0;
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for (x = 0; x < 4; x++) {
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pix = best_cb[y * 4 + x];
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dither = pix % DITHERSTEPS;
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index1 = pix / DITHERSTEPS;
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index2 = FFMIN(index1 + 1, maxindex);
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if (pix > 3 * DITHERSTEPS)
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highdiff += pix - 3 * DITHERSTEPS;
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if (pix < DITHERSTEPS)
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lowdiff += DITHERSTEPS - pix;
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row1 <<= 2;
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if (prep_dither_patterns[dither][y & 3][x & 3]) {
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row1 |= 3-(index2 & 3);
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} else {
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row1 |= 3-(index1 & 3);
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}
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}
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charset[y] = row1;
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}
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/* are we in 5col mode and need to adjust pixels? */
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if (c->mc_use_5col && highdiff > 0 && lowdiff > 0) {
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if (lowdiff > highdiff) {
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for (x = 0; x < 32; x++)
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best_cb[x] = FFMIN(3 * DITHERSTEPS, best_cb[x]);
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} else {
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for (x = 0; x < 32; x++)
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best_cb[x] = FFMAX(DITHERSTEPS, best_cb[x]);
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}
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charpos--; /* redo char */
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} else {
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/* advance pointers */
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best_cb += 32;
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charset += 8;
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if (highdiff > 0) {
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colrammap[charpos] = 0x9;
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} else {
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colrammap[charpos] = 0x8;
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}
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}
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}
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}
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static av_cold int a64multi_close_encoder(AVCodecContext *avctx)
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{
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A64Context *c = avctx->priv_data;
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av_free(c->mc_meta_charset);
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av_free(c->mc_best_cb);
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av_free(c->mc_charmap);
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return 0;
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}
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static av_cold int a64multi_init_encoder(AVCodecContext *avctx)
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{
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A64Context *c = avctx->priv_data;
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av_lfg_init(&c->randctx, 1);
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if (avctx->global_quality < 1) {
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c->mc_lifetime = 4;
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} else {
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c->mc_lifetime = avctx->global_quality /= FF_QP2LAMBDA;
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}
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av_log(avctx, AV_LOG_INFO, "charset lifetime set to %d frame(s)\n", c->mc_lifetime);
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c->mc_frame_counter = 0;
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c->mc_use_5col = avctx->codec->id == CODEC_ID_A64_MULTI5;
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c->mc_meta_charset = av_malloc(32000 * c->mc_lifetime * sizeof(int));
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c->mc_best_cb = av_malloc(256 * 32 * sizeof(int));
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c->mc_charmap = av_malloc(1000 * c->mc_lifetime * sizeof(int));
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avcodec_get_frame_defaults(&c->picture);
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avctx->coded_frame = &c->picture;
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avctx->coded_frame->pict_type = FF_I_TYPE;
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avctx->coded_frame->key_frame = 1;
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if (!avctx->codec_tag)
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avctx->codec_tag = AV_RL32("a64m");
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return 0;
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}
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static int a64multi_encode_frame(AVCodecContext *avctx, unsigned char *buf,
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int buf_size, void *data)
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{
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A64Context *c = avctx->priv_data;
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AVFrame *pict = data;
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AVFrame *const p = (AVFrame *) & c->picture;
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int frame;
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int a;
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uint8_t colrammap[256];
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int *charmap = c->mc_charmap;
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int *meta = c->mc_meta_charset;
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int *best_cb = c->mc_best_cb;
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int frm_size = 0x400 + 0x400 * c->mc_use_5col;
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int req_size;
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/* it is the last frame so prepare to flush */
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if (!data)
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c->mc_lifetime = c->mc_frame_counter;
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req_size = 0x800 + frm_size * c->mc_lifetime;
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if (req_size > buf_size) {
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av_log(avctx, AV_LOG_ERROR, "buf size too small (need %d, got %d)\n", req_size, buf_size);
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return -1;
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}
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/* fill up mc_meta_charset with framedata until lifetime exceeds */
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if (c->mc_frame_counter < c->mc_lifetime) {
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*p = *pict;
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p->pict_type = FF_I_TYPE;
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p->key_frame = 1;
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to_meta_with_crop(avctx, p, meta + 32000 * c->mc_frame_counter);
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c->mc_frame_counter++;
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/* lifetime is not reached */
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return 0;
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}
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/* lifetime exceeded so now convert X frames at once */
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if (c->mc_frame_counter == c->mc_lifetime && c->mc_lifetime > 0) {
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c->mc_frame_counter = 0;
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ff_init_elbg(meta, 32, 1000 * c-> mc_lifetime, best_cb, 256, 5, charmap, &c->randctx);
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ff_do_elbg (meta, 32, 1000 * c-> mc_lifetime, best_cb, 256, 5, charmap, &c->randctx);
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render_charset(avctx, buf, colrammap);
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for (frame = 0; frame < c->mc_lifetime; frame++) {
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for (a = 0; a < 1000; a++) {
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buf[0x800 + a] = charmap[a];
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if (c->mc_use_5col) buf[0xc00 + a] = colrammap[charmap[a]];
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}
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buf += frm_size;
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charmap += 1000;
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}
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return req_size;
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}
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return 0;
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}
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AVCodec a64multi_encoder = {
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.name = "a64multi",
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.type = CODEC_TYPE_VIDEO,
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.id = CODEC_ID_A64_MULTI,
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.priv_data_size = sizeof(A64Context),
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.init = a64multi_init_encoder,
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.encode = a64multi_encode_frame,
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.close = a64multi_close_encoder,
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.pix_fmts = (enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_NONE},
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.long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64"),
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.capabilities = CODEC_CAP_DELAY,
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};
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AVCodec a64multi5_encoder = {
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.name = "a64multi5",
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.type = CODEC_TYPE_VIDEO,
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.id = CODEC_ID_A64_MULTI5,
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.priv_data_size = sizeof(A64Context),
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.init = a64multi_init_encoder,
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.encode = a64multi_encode_frame,
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.close = a64multi_close_encoder,
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.pix_fmts = (enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_NONE},
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.long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64, extended with 5th color (colram)"),
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.capabilities = CODEC_CAP_DELAY,
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};
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92
libavcodec/a64tables.h
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92
libavcodec/a64tables.h
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@ -0,0 +1,92 @@
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/*
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* a64 video encoder - tables used by a64 encoders
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* Copyright (c) 2009 Tobias Bindhammer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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*
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* FFmpeg 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* a64 video encoder - tables used by a64 encoders
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*/
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#ifndef AVCODEC_A64TABLES_H
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#define AVCODEC_A64TABLES_H
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#include <stdint.h>
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/**
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* dither patterns used vor rendering the multicolor charset
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*/
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static const uint8_t prep_dither_patterns[9][4][4] = {
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{
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{0, 0, 0, 0},
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{0, 0, 0, 0},
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{0, 0, 0, 0},
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{0, 0, 0, 0}
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},
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{
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{1, 0, 0, 0},
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{0, 0, 0, 0},
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{0, 0, 1, 0},
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{0, 0, 0, 0}
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},
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{
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{1, 0, 0, 0},
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{0, 0, 1, 0},
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{0, 1, 0, 0},
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{0, 0, 0, 1}
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},
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{
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{1, 0, 0, 0},
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{0, 1, 0, 1},
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{0, 0, 1, 0},
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{0, 1, 0, 1}
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},
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{
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{1, 0, 1, 0},
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{0, 1, 0, 1},
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{1, 0, 1, 0},
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{0, 1, 0, 1}
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},
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{
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{1, 1, 1, 0},
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{0, 1, 0, 1},
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{1, 0, 1, 1},
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{0, 1, 0, 1}
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},
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{
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{0, 1, 1, 1},
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{1, 1, 0, 1},
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{1, 0, 1, 1},
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{1, 1, 1, 0}
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},
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{
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{0, 1, 1, 1},
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{1, 1, 1, 1},
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{1, 1, 0, 1},
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{1, 1, 1, 1}
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},
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{
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{1, 1, 1, 1},
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{1, 1, 1, 1},
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{1, 1, 1, 1},
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{1, 1, 1, 1}
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},
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};
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#endif /* AVCODEC_A64TABLES_H */
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