/* * 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 "a64colors.h"#include "a64tables.h"#include "elbg.h"#include "internal.h"#include "libavutil/avassert.h"#include "libavutil/common.h"#include "libavutil/intreadwrite.h" #define DITHERSTEPS   8#define CHARSET_CHARS 256#define INTERLACED    1#define CROP_SCREENS  1 #define C64XRES 320#define C64YRES 200 typedef struct A64Context {    /* variables for multicolor modes */    AVLFG randctx;    int mc_lifetime;    int mc_use_5col;    unsigned mc_frame_counter;    int *mc_meta_charset;    int *mc_charmap;    int *mc_best_cb;    int mc_luma_vals[5];    uint8_t *mc_charset;    uint8_t *mc_colram;    uint8_t *mc_palette;    int mc_pal_size;     /* pts of the next packet that will be output */    int64_t next_pts;} A64Context; /* gray gradient */static const int mc_colors[5]={0x0,0xb,0xc,0xf,0x1}; /* other possible gradients - to be tested *///static const int mc_colors[5]={0x0,0x8,0xa,0xf,0x7};//static const int mc_colors[5]={0x0,0x9,0x8,0xa,0x3}; static void to_meta_with_crop(AVCodecContext *avctx,                              const 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 < C64YRES; blocky += 8) {        for (blockx = 0; blockx < C64XRES; blockx += 8) {            for (y = blocky; y < blocky + 8 && y < C64YRES; y++) {                for (x = blockx; x < blockx + 8 && x < C64XRES; x += 2) {                    if(x < width && y < height) {                        if (x + 1 < width) {                            /* build average over 2 pixels */                            luma = (src[(x + 0 + y * p->linesize[0])] +                                    src[(x + 1 + y * p->linesize[0])]) / 2;                        } else {                            luma = src[(x + y * p->linesize[0])];                        }                        /* 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, row2;    int charpos, x, y;    int a, b;    uint8_t pix;    int lowdiff, highdiff;    int *best_cb = c->mc_best_cb;    static uint8_t index1[256];    static uint8_t index2[256];    static uint8_t dither[256];    int i;    int distance;     /* generate lookup-tables for dither and index before looping */    i = 0;    for (a=0; a < 256; a++) {        if(i < c->mc_pal_size -1 && a == c->mc_luma_vals[i + 1]) {            distance = c->mc_luma_vals[i + 1] - c->mc_luma_vals[i];            for(b = 0; b <= distance; b++) {                  dither[c->mc_luma_vals[i] + b] = b * (DITHERSTEPS - 1) / distance;            }            i++;        }        if(i >= c->mc_pal_size - 1) dither[a] = 0;        index1[a] = i;        index2[a] = FFMIN(i + 1, c->mc_pal_size - 1);    }     /* and render charset */    for (charpos = 0; charpos < CHARSET_CHARS; charpos++) {        lowdiff  = 0;        highdiff = 0;        for (y = 0; y < 8; y++) {            row1 = 0; row2 = 0;            for (x = 0; x < 4; x++) {                pix = best_cb[y * 4 + x];                 /* accumulate error for brightest/darkest color */                if (index1[pix] >= 3)                    highdiff += pix - c->mc_luma_vals[3];                if (index1[pix] < 1)                    lowdiff += c->mc_luma_vals[1] - pix;                 row1 <<= 2;                 if (INTERLACED) {                    row2 <<= 2;                    if (interlaced_dither_patterns[dither[pix]][(y & 3) * 2 + 0][x & 3])                        row1 |= 3-(index2[pix] & 3);                    else                        row1 |= 3-(index1[pix] & 3);                     if (interlaced_dither_patterns[dither[pix]][(y & 3) * 2 + 1][x & 3])                        row2 |= 3-(index2[pix] & 3);                    else                        row2 |= 3-(index1[pix] & 3);                }                else {                    if (multi_dither_patterns[dither[pix]][(y & 3)][x & 3])                        row1 |= 3-(index2[pix] & 3);                    else                        row1 |= 3-(index1[pix] & 3);                }            }            charset[y+0x000] = row1;            if (INTERLACED) charset[y+0x800] = row2;        }        /* do we need to adjust pixels? */        if (highdiff > 0 && lowdiff > 0 && c->mc_use_5col) {            if (lowdiff > highdiff) {                for (x = 0; x < 32; x++)                    best_cb[x] = FFMIN(c->mc_luma_vals[3], best_cb[x]);            } else {                for (x = 0; x < 32; x++)                    best_cb[x] = FFMAX(c->mc_luma_vals[1], best_cb[x]);            }            charpos--;          /* redo now adjusted char */        /* no adjustment needed, all fine */        } else {            /* advance pointers */            best_cb += 32;            charset += 8;             /* remember colorram value */            colrammap[charpos] = (highdiff > 0);        }    }} static av_cold int a64multi_close_encoder(AVCodecContext *avctx){    A64Context *c = avctx->priv_data;    av_freep(&c->mc_meta_charset);    av_freep(&c->mc_best_cb);    av_freep(&c->mc_charset);    av_freep(&c->mc_charmap);    av_freep(&c->mc_colram);    return 0;} static av_cold int a64multi_encode_init(AVCodecContext *avctx){    A64Context *c = avctx->priv_data;    int a;    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 == AV_CODEC_ID_A64_MULTI5;    c->mc_pal_size      = 4 + c->mc_use_5col;     /* precalc luma values for later use */    for (a = 0; a < c->mc_pal_size; a++) {        c->mc_luma_vals[a]=a64_palette[mc_colors[a]][0] * 0.30 +                           a64_palette[mc_colors[a]][1] * 0.59 +                           a64_palette[mc_colors[a]][2] * 0.11;    }     if (!(c->mc_meta_charset = av_mallocz_array(c->mc_lifetime, 32000 * sizeof(int))) ||       !(c->mc_best_cb       = av_malloc(CHARSET_CHARS * 32 * sizeof(int)))     ||       !(c->mc_charmap       = av_mallocz_array(c->mc_lifetime, 1000 * sizeof(int))) ||       !(c->mc_colram        = av_mallocz(CHARSET_CHARS * sizeof(uint8_t)))     ||       !(c->mc_charset       = av_malloc(0x800 * (INTERLACED+1) * sizeof(uint8_t)))) {        av_log(avctx, AV_LOG_ERROR, "Failed to allocate buffer memory.\n");        return AVERROR(ENOMEM);    }     /* set up extradata */    if (!(avctx->extradata = av_mallocz(8 * 4 + AV_INPUT_BUFFER_PADDING_SIZE))) {        av_log(avctx, AV_LOG_ERROR, "Failed to allocate memory for extradata.\n");        return AVERROR(ENOMEM);    }    avctx->extradata_size = 8 * 4;    AV_WB32(avctx->extradata, c->mc_lifetime);    AV_WB32(avctx->extradata + 16, INTERLACED);     if (!avctx->codec_tag)         avctx->codec_tag = AV_RL32("a64m");     c->next_pts = AV_NOPTS_VALUE;     return 0;} static void a64_compress_colram(unsigned char *buf, int *charmap, uint8_t *colram){    int a;    uint8_t temp;    /* only needs to be done in 5col mode */    /* XXX could be squeezed to 0x80 bytes */    for (a = 0; a < 256; a++) {        temp  = colram[charmap[a + 0x000]] << 0;        temp |= colram[charmap[a + 0x100]] << 1;        temp |= colram[charmap[a + 0x200]] << 2;        if (a < 0xe8) temp |= colram[charmap[a + 0x300]] << 3;        buf[a] = temp << 2;    }} static int a64multi_encode_frame(AVCodecContext *avctx, AVPacket *pkt,                                 const AVFrame *p, int *got_packet){    A64Context *c = avctx->priv_data;     int frame;    int x, y;    int b_height;    int b_width;     int req_size, ret;    uint8_t *buf = NULL;     int *charmap     = c->mc_charmap;    uint8_t *colram  = c->mc_colram;    uint8_t *charset = c->mc_charset;    int *meta        = c->mc_meta_charset;    int *best_cb     = c->mc_best_cb;     int charset_size = 0x800 * (INTERLACED + 1);    int colram_size  = 0x100 * c->mc_use_5col;    int screen_size;     if(CROP_SCREENS) {        b_height = FFMIN(avctx->height,C64YRES) >> 3;        b_width  = FFMIN(avctx->width ,C64XRES) >> 3;        screen_size = b_width * b_height;    } else {        b_height = C64YRES >> 3;        b_width  = C64XRES >> 3;        screen_size = 0x400;    }     /* no data, means end encoding asap */    if (!p) {        /* all done, end encoding */        if (!c->mc_lifetime) return 0;        /* no more frames in queue, prepare to flush remaining frames */        if (!c->mc_frame_counter) {            c->mc_lifetime = 0;        }        /* still frames in queue so limit lifetime to remaining frames */        else c->mc_lifetime = c->mc_frame_counter;    /* still new data available */    } else {        /* fill up mc_meta_charset with data until lifetime exceeds */        if (c->mc_frame_counter < c->mc_lifetime) {            to_meta_with_crop(avctx, p, meta + 32000 * c->mc_frame_counter);            c->mc_frame_counter++;            if (c->next_pts == AV_NOPTS_VALUE)                c->next_pts = p->pts;            /* lifetime is not reached so wait for next frame first */            return 0;        }    }     /* lifetime reached so now convert X frames at once */    if (c->mc_frame_counter == c->mc_lifetime) {        req_size = 0;        /* any frames to encode? */        if (c->mc_lifetime) {            int alloc_size = charset_size + c->mc_lifetime*(screen_size + colram_size);            if ((ret = ff_alloc_packet2(avctx, pkt, alloc_size, 0)) < 0)                return ret;            buf = pkt->data;             /* calc optimal new charset + charmaps */            ret = avpriv_init_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb,                               CHARSET_CHARS, 50, charmap, &c->randctx);            if (ret < 0)                return ret;            ret = avpriv_do_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb,                             CHARSET_CHARS, 50, charmap, &c->randctx);            if (ret < 0)                return ret;             /* create colorram map and a c64 readable charset */            render_charset(avctx, charset, colram);             /* copy charset to buf */            memcpy(buf, charset, charset_size);             /* advance pointers */            buf      += charset_size;            req_size += charset_size;        }         /* write x frames to buf */        for (frame = 0; frame < c->mc_lifetime; frame++) {            /* copy charmap to buf. buf is uchar*, charmap is int*, so no memcpy here, sorry */            for (y = 0; y < b_height; y++) {                for (x = 0; x < b_width; x++) {                    buf[y * b_width + x] = charmap[y * b_width + x];                }            }            /* advance pointers */            buf += screen_size;            req_size += screen_size;             /* compress and copy colram to buf */            if (c->mc_use_5col) {                a64_compress_colram(buf, charmap, colram);                /* advance pointers */                buf += colram_size;                req_size += colram_size;            }             /* advance to next charmap */            charmap += 1000;        }         AV_WB32(avctx->extradata + 4,  c->mc_frame_counter);        AV_WB32(avctx->extradata + 8,  charset_size);        AV_WB32(avctx->extradata + 12, screen_size + colram_size);         /* reset counter */        c->mc_frame_counter = 0;         pkt->pts = pkt->dts = c->next_pts;        c->next_pts         = AV_NOPTS_VALUE;         av_assert0(pkt->size >= req_size);        pkt->size   = req_size;        pkt->flags |= AV_PKT_FLAG_KEY;        *got_packet = !!req_size;    }    return 0;} #if CONFIG_A64MULTI_ENCODERAVCodec ff_a64multi_encoder = {    .name           = "a64multi",    .long_name      = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64"),    .type           = AVMEDIA_TYPE_VIDEO,    .id             = AV_CODEC_ID_A64_MULTI,    .priv_data_size = sizeof(A64Context),    .init           = a64multi_encode_init,    .encode2        = a64multi_encode_frame,    .close          = a64multi_close_encoder,    .pix_fmts       = (const enum AVPixelFormat[]) {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE},    .capabilities   = AV_CODEC_CAP_DELAY,};#endif#if CONFIG_A64MULTI5_ENCODERAVCodec ff_a64multi5_encoder = {    .name           = "a64multi5",    .long_name      = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64, extended with 5th color (colram)"),    .type           = AVMEDIA_TYPE_VIDEO,    .id             = AV_CODEC_ID_A64_MULTI5,    .priv_data_size = sizeof(A64Context),    .init           = a64multi_encode_init,    .encode2        = a64multi_encode_frame,    .close          = a64multi_close_encoder,    .pix_fmts       = (const enum AVPixelFormat[]) {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE},    .capabilities   = AV_CODEC_CAP_DELAY,};#endif