diff options
author | Tobias Bindhammer <tobias.bindhammer@uni-ulm.de> | 2010-08-23 15:46:32 +0400 |
---|---|---|
committer | Tobias Bindhammer <tobias.bindhammer@uni-ulm.de> | 2010-08-23 15:46:32 +0400 |
commit | 7bf7833fb739fd436ca7fc98b30d6103f09931b1 (patch) | |
tree | c77c9986e76af752c6e615b15e08b44b9653f31c | |
parent | 620918e4bf69ad137b0a149c3a5fda501477eae0 (diff) |
Initial version of the a64 (multicolor charset) codec
Originally committed as revision 24873 to svn://svn.ffmpeg.org/ffmpeg/trunk
-rw-r--r-- | libavcodec/a64enc.h | 50 | ||||
-rw-r--r-- | libavcodec/a64multienc.c | 248 | ||||
-rw-r--r-- | libavcodec/a64tables.h | 92 |
3 files changed, 390 insertions, 0 deletions
diff --git a/libavcodec/a64enc.h b/libavcodec/a64enc.h new file mode 100644 index 0000000000..3002f5001d --- /dev/null +++ b/libavcodec/a64enc.h @@ -0,0 +1,50 @@ +/* + * a64 video encoder - basic headers + * Copyright (c) 2009 Tobias Bindhammer + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * a64 video encoder - basic headers + */ + +#ifndef AVCODEC_A64ENC_H +#define AVCODEC_A64ENC_H + +#include "libavutil/lfg.h" +#include "avcodec.h" + +#define C64XRES 320 +#define C64YRES 200 + +typedef struct A64Context { + /* general variables */ + AVFrame picture; + + /* variables for multicolor modes */ + AVLFG randctx; + int mc_lifetime; + int mc_use_5col; + int mc_frame_counter; + int *mc_meta_charset; + int *mc_charmap; + int *mc_best_cb; +} A64Context; + +#endif /* AVCODEC_A64ENC_H */ diff --git a/libavcodec/a64multienc.c b/libavcodec/a64multienc.c new file mode 100644 index 0000000000..d2d0a1672a --- /dev/null +++ b/libavcodec/a64multienc.c @@ -0,0 +1,248 @@ +/* + * a64 video encoder - multicolor modes + * Copyright (c) 2009 Tobias Bindhammer + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * a64 video encoder - multicolor modes + */ + +#include "a64enc.h" +#include "a64tables.h" +#include "elbg.h" +#include "libavutil/intreadwrite.h" + +#define DITHERSTEPS 8 + +static void to_meta_with_crop(AVCodecContext *avctx, AVFrame *p, int *dest) +{ + int blockx, blocky, x, y; + int luma = 0; + int height = FFMIN(avctx->height,C64YRES); + int width = FFMIN(avctx->width ,C64XRES); + uint8_t *src = p->data[0]; + + for (blocky = 0; blocky < height; blocky += 8) { + for (blockx = 0; blockx < C64XRES; blockx += 8) { + for (y = blocky; y < blocky+8 && y < height; y++) { + for (x = blockx; x < blockx+8 && x < C64XRES; x += 2) { + if(x < width) { + /* build average over 2 pixels */ + luma = (src[(x + 0 + y * p->linesize[0])] + + src[(x + 1 + y * p->linesize[0])]) / 2; + /* write blocks as linear data now so they are suitable for elbg */ + dest[0] = luma; + } + dest++; + } + } + } + } +} + +static void render_charset(AVCodecContext *avctx, uint8_t *charset, + uint8_t *colrammap) +{ + A64Context *c = avctx->priv_data; + uint8_t row1; + int charpos, x, y; + int pix; + int dither; + int index1, index2; + int lowdiff, highdiff; + int maxindex = c->mc_use_5col + 3; + int maxsteps = DITHERSTEPS * maxindex + 1; + int *best_cb = c->mc_best_cb; + + /* now reduce colors first */ + for (x = 0; x < 256 * 32; x++) best_cb[x] = best_cb[x] * maxsteps / 255; + + /* and render charset */ + for (charpos = 0; charpos < 256; charpos++) { + lowdiff = 0; + highdiff = 0; + for (y = 0; y < 8; y++) { + row1 = 0; + for (x = 0; x < 4; x++) { + pix = best_cb[y * 4 + x]; + dither = pix % DITHERSTEPS; + index1 = pix / DITHERSTEPS; + index2 = FFMIN(index1 + 1, maxindex); + + if (pix > 3 * DITHERSTEPS) + highdiff += pix - 3 * DITHERSTEPS; + if (pix < DITHERSTEPS) + lowdiff += DITHERSTEPS - pix; + + row1 <<= 2; + if (prep_dither_patterns[dither][y & 3][x & 3]) { + row1 |= 3-(index2 & 3); + } else { + row1 |= 3-(index1 & 3); + } + } + charset[y] = row1; + } + + /* are we in 5col mode and need to adjust pixels? */ + if (c->mc_use_5col && highdiff > 0 && lowdiff > 0) { + if (lowdiff > highdiff) { + for (x = 0; x < 32; x++) + best_cb[x] = FFMIN(3 * DITHERSTEPS, best_cb[x]); + } else { + for (x = 0; x < 32; x++) + best_cb[x] = FFMAX(DITHERSTEPS, best_cb[x]); + } + charpos--; /* redo char */ + } else { + /* advance pointers */ + best_cb += 32; + charset += 8; + + if (highdiff > 0) { + colrammap[charpos] = 0x9; + } else { + colrammap[charpos] = 0x8; + } + } + } +} + +static av_cold int a64multi_close_encoder(AVCodecContext *avctx) +{ + A64Context *c = avctx->priv_data; + av_free(c->mc_meta_charset); + av_free(c->mc_best_cb); + av_free(c->mc_charmap); + return 0; +} + +static av_cold int a64multi_init_encoder(AVCodecContext *avctx) +{ + A64Context *c = avctx->priv_data; + av_lfg_init(&c->randctx, 1); + + if (avctx->global_quality < 1) { + c->mc_lifetime = 4; + } else { + c->mc_lifetime = avctx->global_quality /= FF_QP2LAMBDA; + } + + av_log(avctx, AV_LOG_INFO, "charset lifetime set to %d frame(s)\n", c->mc_lifetime); + + c->mc_frame_counter = 0; + c->mc_use_5col = avctx->codec->id == CODEC_ID_A64_MULTI5; + c->mc_meta_charset = av_malloc(32000 * c->mc_lifetime * sizeof(int)); + c->mc_best_cb = av_malloc(256 * 32 * sizeof(int)); + c->mc_charmap = av_malloc(1000 * c->mc_lifetime * sizeof(int)); + + avcodec_get_frame_defaults(&c->picture); + avctx->coded_frame = &c->picture; + avctx->coded_frame->pict_type = FF_I_TYPE; + avctx->coded_frame->key_frame = 1; + if (!avctx->codec_tag) + avctx->codec_tag = AV_RL32("a64m"); + + return 0; +} + +static int a64multi_encode_frame(AVCodecContext *avctx, unsigned char *buf, + int buf_size, void *data) +{ + A64Context *c = avctx->priv_data; + AVFrame *pict = data; + AVFrame *const p = (AVFrame *) & c->picture; + + int frame; + int a; + + uint8_t colrammap[256]; + int *charmap = c->mc_charmap; + int *meta = c->mc_meta_charset; + int *best_cb = c->mc_best_cb; + int frm_size = 0x400 + 0x400 * c->mc_use_5col; + int req_size; + + /* it is the last frame so prepare to flush */ + if (!data) + c->mc_lifetime = c->mc_frame_counter; + + req_size = 0x800 + frm_size * c->mc_lifetime; + + if (req_size > buf_size) { + av_log(avctx, AV_LOG_ERROR, "buf size too small (need %d, got %d)\n", req_size, buf_size); + return -1; + } + /* fill up mc_meta_charset with framedata until lifetime exceeds */ + if (c->mc_frame_counter < c->mc_lifetime) { + *p = *pict; + p->pict_type = FF_I_TYPE; + p->key_frame = 1; + to_meta_with_crop(avctx, p, meta + 32000 * c->mc_frame_counter); + c->mc_frame_counter++; + /* lifetime is not reached */ + return 0; + } + /* lifetime exceeded so now convert X frames at once */ + if (c->mc_frame_counter == c->mc_lifetime && c->mc_lifetime > 0) { + c->mc_frame_counter = 0; + ff_init_elbg(meta, 32, 1000 * c-> mc_lifetime, best_cb, 256, 5, charmap, &c->randctx); + ff_do_elbg (meta, 32, 1000 * c-> mc_lifetime, best_cb, 256, 5, charmap, &c->randctx); + + render_charset(avctx, buf, colrammap); + + for (frame = 0; frame < c->mc_lifetime; frame++) { + for (a = 0; a < 1000; a++) { + buf[0x800 + a] = charmap[a]; + if (c->mc_use_5col) buf[0xc00 + a] = colrammap[charmap[a]]; + } + buf += frm_size; + charmap += 1000; + } + return req_size; + } + return 0; +} + +AVCodec a64multi_encoder = { + .name = "a64multi", + .type = CODEC_TYPE_VIDEO, + .id = CODEC_ID_A64_MULTI, + .priv_data_size = sizeof(A64Context), + .init = a64multi_init_encoder, + .encode = a64multi_encode_frame, + .close = a64multi_close_encoder, + .pix_fmts = (enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64"), + .capabilities = CODEC_CAP_DELAY, +}; + +AVCodec a64multi5_encoder = { + .name = "a64multi5", + .type = CODEC_TYPE_VIDEO, + .id = CODEC_ID_A64_MULTI5, + .priv_data_size = sizeof(A64Context), + .init = a64multi_init_encoder, + .encode = a64multi_encode_frame, + .close = a64multi_close_encoder, + .pix_fmts = (enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64, extended with 5th color (colram)"), + .capabilities = CODEC_CAP_DELAY, +}; diff --git a/libavcodec/a64tables.h b/libavcodec/a64tables.h new file mode 100644 index 0000000000..31d8c2e2a0 --- /dev/null +++ b/libavcodec/a64tables.h @@ -0,0 +1,92 @@ +/* + * a64 video encoder - tables used by a64 encoders + * Copyright (c) 2009 Tobias Bindhammer + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * a64 video encoder - tables used by a64 encoders + */ + +#ifndef AVCODEC_A64TABLES_H +#define AVCODEC_A64TABLES_H + +#include <stdint.h> + +/** + * dither patterns used vor rendering the multicolor charset + */ +static const uint8_t prep_dither_patterns[9][4][4] = { + { + {0, 0, 0, 0}, + {0, 0, 0, 0}, + {0, 0, 0, 0}, + {0, 0, 0, 0} + }, + { + {1, 0, 0, 0}, + {0, 0, 0, 0}, + {0, 0, 1, 0}, + {0, 0, 0, 0} + }, + { + {1, 0, 0, 0}, + {0, 0, 1, 0}, + {0, 1, 0, 0}, + {0, 0, 0, 1} + }, + { + {1, 0, 0, 0}, + {0, 1, 0, 1}, + {0, 0, 1, 0}, + {0, 1, 0, 1} + }, + { + {1, 0, 1, 0}, + {0, 1, 0, 1}, + {1, 0, 1, 0}, + {0, 1, 0, 1} + }, + { + {1, 1, 1, 0}, + {0, 1, 0, 1}, + {1, 0, 1, 1}, + {0, 1, 0, 1} + }, + { + {0, 1, 1, 1}, + {1, 1, 0, 1}, + {1, 0, 1, 1}, + {1, 1, 1, 0} + }, + { + {0, 1, 1, 1}, + {1, 1, 1, 1}, + {1, 1, 0, 1}, + {1, 1, 1, 1} + }, + { + {1, 1, 1, 1}, + {1, 1, 1, 1}, + {1, 1, 1, 1}, + {1, 1, 1, 1} + }, +}; + +#endif /* AVCODEC_A64TABLES_H */ |