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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 "a64colors.h" |
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#include "a64tables.h" |
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#include "elbg.h" |
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#include "internal.h" |
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#include "libavutil/avassert.h" |
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#include "libavutil/common.h" |
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#include "libavutil/intreadwrite.h" |
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#define DITHERSTEPS 8 |
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#define CHARSET_CHARS 256 |
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#define INTERLACED 1 |
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#define CROP_SCREENS 1 |
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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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/* 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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unsigned 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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int mc_luma_vals[5]; |
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uint8_t *mc_charset; |
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uint8_t *mc_colram; |
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uint8_t *mc_palette; |
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int mc_pal_size; |
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/* pts of the next packet that will be output */ |
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int64_t next_pts; |
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} A64Context; |
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/* gray gradient */ |
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static const uint8_t mc_colors[5]={0x0,0xb,0xc,0xf,0x1}; |
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/* other possible gradients - to be tested */ |
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//static const uint8_t mc_colors[5]={0x0,0x8,0xa,0xf,0x7}; |
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//static const uint8_t mc_colors[5]={0x0,0x9,0x8,0xa,0x3}; |
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static void to_meta_with_crop(AVCodecContext *avctx, |
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const 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 < C64YRES; blocky += 8) { |
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for (blockx = 0; blockx < C64XRES; blockx += 8) { |
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for (y = blocky; y < blocky + 8 && y < C64YRES; y++) { |
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for (x = blockx; x < blockx + 8 && x < C64XRES; x += 2) { |
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if(x < width && y < height) { |
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if (x + 1 < 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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} else { |
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luma = src[(x + y * p->linesize[0])]; |
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} |
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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, row2; |
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int charpos, x, y; |
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int a, b; |
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uint8_t pix; |
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int lowdiff, highdiff; |
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int *best_cb = c->mc_best_cb; |
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static uint8_t index1[256]; |
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static uint8_t index2[256]; |
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static uint8_t dither[256]; |
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int i; |
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int distance; |
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/* generate lookup-tables for dither and index before looping */ |
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i = 0; |
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for (a=0; a < 256; a++) { |
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if(i < c->mc_pal_size -1 && a == c->mc_luma_vals[i + 1]) { |
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distance = c->mc_luma_vals[i + 1] - c->mc_luma_vals[i]; |
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for(b = 0; b <= distance; b++) { |
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dither[c->mc_luma_vals[i] + b] = b * (DITHERSTEPS - 1) / distance; |
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} |
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i++; |
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} |
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if(i >= c->mc_pal_size - 1) dither[a] = 0; |
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index1[a] = i; |
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index2[a] = FFMIN(i + 1, c->mc_pal_size - 1); |
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} |
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/* and render charset */ |
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for (charpos = 0; charpos < CHARSET_CHARS; 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; row2 = 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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/* accumulate error for brightest/darkest color */ |
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if (index1[pix] >= 3) |
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highdiff += pix - c->mc_luma_vals[3]; |
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if (index1[pix] < 1) |
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lowdiff += c->mc_luma_vals[1] - pix; |
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row1 <<= 2; |
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if (INTERLACED) { |
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row2 <<= 2; |
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if (interlaced_dither_patterns[dither[pix]][(y & 3) * 2 + 0][x & 3]) |
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row1 |= 3-(index2[pix] & 3); |
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else |
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row1 |= 3-(index1[pix] & 3); |
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if (interlaced_dither_patterns[dither[pix]][(y & 3) * 2 + 1][x & 3]) |
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row2 |= 3-(index2[pix] & 3); |
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else |
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row2 |= 3-(index1[pix] & 3); |
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} |
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else { |
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if (multi_dither_patterns[dither[pix]][(y & 3)][x & 3]) |
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row1 |= 3-(index2[pix] & 3); |
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else |
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row1 |= 3-(index1[pix] & 3); |
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} |
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} |
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charset[y+0x000] = row1; |
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if (INTERLACED) charset[y+0x800] = row2; |
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} |
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/* do we need to adjust pixels? */ |
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if (highdiff > 0 && lowdiff > 0 && c->mc_use_5col) { |
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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(c->mc_luma_vals[3], 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(c->mc_luma_vals[1], best_cb[x]); |
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} |
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charpos--; /* redo now adjusted char */ |
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/* no adjustment needed, all fine */ |
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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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/* remember colorram value */ |
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colrammap[charpos] = (highdiff > 0); |
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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_freep(&c->mc_meta_charset); |
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av_freep(&c->mc_best_cb); |
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av_freep(&c->mc_charset); |
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av_freep(&c->mc_charmap); |
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av_freep(&c->mc_colram); |
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return 0; |
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} |
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static av_cold int a64multi_encode_init(AVCodecContext *avctx) |
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{ |
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A64Context *c = avctx->priv_data; |
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int a; |
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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 == AV_CODEC_ID_A64_MULTI5; |
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c->mc_pal_size = 4 + c->mc_use_5col; |
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/* precalc luma values for later use */ |
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for (a = 0; a < c->mc_pal_size; a++) { |
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c->mc_luma_vals[a]=a64_palette[mc_colors[a]][0] * 0.30 + |
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a64_palette[mc_colors[a]][1] * 0.59 + |
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a64_palette[mc_colors[a]][2] * 0.11; |
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} |
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if (!(c->mc_meta_charset = av_mallocz_array(c->mc_lifetime, 32000 * sizeof(int))) || |
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!(c->mc_best_cb = av_malloc(CHARSET_CHARS * 32 * sizeof(int))) || |
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!(c->mc_charmap = av_mallocz_array(c->mc_lifetime, 1000 * sizeof(int))) || |
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!(c->mc_colram = av_mallocz(CHARSET_CHARS * sizeof(uint8_t))) || |
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!(c->mc_charset = av_malloc(0x800 * (INTERLACED+1) * sizeof(uint8_t)))) { |
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av_log(avctx, AV_LOG_ERROR, "Failed to allocate buffer memory.\n"); |
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return AVERROR(ENOMEM); |
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} |
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/* set up extradata */ |
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if (!(avctx->extradata = av_mallocz(8 * 4 + AV_INPUT_BUFFER_PADDING_SIZE))) { |
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av_log(avctx, AV_LOG_ERROR, "Failed to allocate memory for extradata.\n"); |
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return AVERROR(ENOMEM); |
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} |
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avctx->extradata_size = 8 * 4; |
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AV_WB32(avctx->extradata, c->mc_lifetime); |
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AV_WB32(avctx->extradata + 16, INTERLACED); |
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if (!avctx->codec_tag) |
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avctx->codec_tag = AV_RL32("a64m"); |
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c->next_pts = AV_NOPTS_VALUE; |
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return 0; |
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} |
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static void a64_compress_colram(unsigned char *buf, int *charmap, uint8_t *colram) |
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{ |
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int a; |
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uint8_t temp; |
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/* only needs to be done in 5col mode */ |
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/* XXX could be squeezed to 0x80 bytes */ |
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for (a = 0; a < 256; a++) { |
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temp = colram[charmap[a + 0x000]] << 0; |
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temp |= colram[charmap[a + 0x100]] << 1; |
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temp |= colram[charmap[a + 0x200]] << 2; |
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if (a < 0xe8) temp |= colram[charmap[a + 0x300]] << 3; |
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buf[a] = temp << 2; |
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} |
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} |
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static int a64multi_encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
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const AVFrame *p, int *got_packet) |
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{ |
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A64Context *c = avctx->priv_data; |
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int frame; |
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int x, y; |
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int b_height; |
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int b_width; |
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int req_size, ret; |
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uint8_t *buf = NULL; |
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int *charmap = c->mc_charmap; |
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uint8_t *colram = c->mc_colram; |
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uint8_t *charset = c->mc_charset; |
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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 charset_size = 0x800 * (INTERLACED + 1); |
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int colram_size = 0x100 * c->mc_use_5col; |
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int screen_size; |
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if(CROP_SCREENS) { |
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b_height = FFMIN(avctx->height,C64YRES) >> 3; |
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b_width = FFMIN(avctx->width ,C64XRES) >> 3; |
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screen_size = b_width * b_height; |
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} else { |
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b_height = C64YRES >> 3; |
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b_width = C64XRES >> 3; |
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screen_size = 0x400; |
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} |
301 |
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302 |
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/* no data, means end encoding asap */ |
303 |
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if (!p) { |
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/* all done, end encoding */ |
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if (!c->mc_lifetime) return 0; |
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/* no more frames in queue, prepare to flush remaining frames */ |
307 |
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if (!c->mc_frame_counter) { |
308 |
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c->mc_lifetime = 0; |
309 |
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} |
310 |
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/* still frames in queue so limit lifetime to remaining frames */ |
311 |
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else c->mc_lifetime = c->mc_frame_counter; |
312 |
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/* still new data available */ |
313 |
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} else { |
314 |
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/* fill up mc_meta_charset with data until lifetime exceeds */ |
315 |
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if (c->mc_frame_counter < c->mc_lifetime) { |
316 |
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to_meta_with_crop(avctx, p, meta + 32000 * c->mc_frame_counter); |
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c->mc_frame_counter++; |
318 |
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if (c->next_pts == AV_NOPTS_VALUE) |
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c->next_pts = p->pts; |
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/* lifetime is not reached so wait for next frame first */ |
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return 0; |
322 |
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} |
323 |
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} |
324 |
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325 |
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/* lifetime reached so now convert X frames at once */ |
326 |
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if (c->mc_frame_counter == c->mc_lifetime) { |
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req_size = 0; |
328 |
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/* any frames to encode? */ |
329 |
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if (c->mc_lifetime) { |
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int alloc_size = charset_size + c->mc_lifetime*(screen_size + colram_size); |
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if ((ret = ff_alloc_packet2(avctx, pkt, alloc_size, 0)) < 0) |
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return ret; |
333 |
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buf = pkt->data; |
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/* calc optimal new charset + charmaps */ |
336 |
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ret = avpriv_init_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb, |
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CHARSET_CHARS, 50, charmap, &c->randctx); |
338 |
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if (ret < 0) |
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return ret; |
340 |
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ret = avpriv_do_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb, |
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CHARSET_CHARS, 50, charmap, &c->randctx); |
342 |
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if (ret < 0) |
343 |
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return ret; |
344 |
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345 |
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/* create colorram map and a c64 readable charset */ |
346 |
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render_charset(avctx, charset, colram); |
347 |
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348 |
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/* copy charset to buf */ |
349 |
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memcpy(buf, charset, charset_size); |
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351 |
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/* advance pointers */ |
352 |
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buf += charset_size; |
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req_size += charset_size; |
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} |
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356 |
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/* write x frames to buf */ |
357 |
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for (frame = 0; frame < c->mc_lifetime; frame++) { |
358 |
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/* copy charmap to buf. buf is uchar*, charmap is int*, so no memcpy here, sorry */ |
359 |
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for (y = 0; y < b_height; y++) { |
360 |
|
|
for (x = 0; x < b_width; x++) { |
361 |
|
|
buf[y * b_width + x] = charmap[y * b_width + x]; |
362 |
|
|
} |
363 |
|
|
} |
364 |
|
|
/* advance pointers */ |
365 |
|
|
buf += screen_size; |
366 |
|
|
req_size += screen_size; |
367 |
|
|
|
368 |
|
|
/* compress and copy colram to buf */ |
369 |
|
|
if (c->mc_use_5col) { |
370 |
|
|
a64_compress_colram(buf, charmap, colram); |
371 |
|
|
/* advance pointers */ |
372 |
|
|
buf += colram_size; |
373 |
|
|
req_size += colram_size; |
374 |
|
|
} |
375 |
|
|
|
376 |
|
|
/* advance to next charmap */ |
377 |
|
|
charmap += 1000; |
378 |
|
|
} |
379 |
|
|
|
380 |
|
|
AV_WB32(avctx->extradata + 4, c->mc_frame_counter); |
381 |
|
|
AV_WB32(avctx->extradata + 8, charset_size); |
382 |
|
|
AV_WB32(avctx->extradata + 12, screen_size + colram_size); |
383 |
|
|
|
384 |
|
|
/* reset counter */ |
385 |
|
|
c->mc_frame_counter = 0; |
386 |
|
|
|
387 |
|
|
pkt->pts = pkt->dts = c->next_pts; |
388 |
|
|
c->next_pts = AV_NOPTS_VALUE; |
389 |
|
|
|
390 |
|
|
av_assert0(pkt->size >= req_size); |
391 |
|
|
pkt->size = req_size; |
392 |
|
|
pkt->flags |= AV_PKT_FLAG_KEY; |
393 |
|
|
*got_packet = !!req_size; |
394 |
|
|
} |
395 |
|
|
return 0; |
396 |
|
|
} |
397 |
|
|
|
398 |
|
|
#if CONFIG_A64MULTI_ENCODER |
399 |
|
|
AVCodec ff_a64multi_encoder = { |
400 |
|
|
.name = "a64multi", |
401 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64"), |
402 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
403 |
|
|
.id = AV_CODEC_ID_A64_MULTI, |
404 |
|
|
.priv_data_size = sizeof(A64Context), |
405 |
|
|
.init = a64multi_encode_init, |
406 |
|
|
.encode2 = a64multi_encode_frame, |
407 |
|
|
.close = a64multi_close_encoder, |
408 |
|
|
.pix_fmts = (const enum AVPixelFormat[]) {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE}, |
409 |
|
|
.capabilities = AV_CODEC_CAP_DELAY, |
410 |
|
|
}; |
411 |
|
|
#endif |
412 |
|
|
#if CONFIG_A64MULTI5_ENCODER |
413 |
|
|
AVCodec ff_a64multi5_encoder = { |
414 |
|
|
.name = "a64multi5", |
415 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64, extended with 5th color (colram)"), |
416 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
417 |
|
|
.id = AV_CODEC_ID_A64_MULTI5, |
418 |
|
|
.priv_data_size = sizeof(A64Context), |
419 |
|
|
.init = a64multi_encode_init, |
420 |
|
|
.encode2 = a64multi_encode_frame, |
421 |
|
|
.close = a64multi_close_encoder, |
422 |
|
|
.pix_fmts = (const enum AVPixelFormat[]) {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE}, |
423 |
|
|
.capabilities = AV_CODEC_CAP_DELAY, |
424 |
|
|
}; |
425 |
|
|
#endif |