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-rw-r--r--ffmpeg1/libavcodec/a64multienc.c423
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diff --git a/ffmpeg1/libavcodec/a64multienc.c b/ffmpeg1/libavcodec/a64multienc.c
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+/*
+ * 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/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 {
+ /* general variables */
+ AVFrame picture;
+
+ /* 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, 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) {
+ /* 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, 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_free(c->mc_meta_charset);
+ av_free(c->mc_best_cb);
+ av_free(c->mc_charset);
+ av_free(c->mc_charmap);
+ av_free(c->mc_colram);
+ return 0;
+}
+
+static av_cold int a64multi_init_encoder(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_malloc(32000 * c->mc_lifetime * sizeof(int))) ||
+ !(c->mc_best_cb = av_malloc(CHARSET_CHARS * 32 * sizeof(int))) ||
+ !(c->mc_charmap = av_mallocz(1000 * c->mc_lifetime * 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 + FF_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);
+
+ avcodec_get_frame_defaults(&c->picture);
+ avctx->coded_frame = &c->picture;
+ avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
+ avctx->coded_frame->key_frame = 1;
+ 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 *pict, int *got_packet)
+{
+ A64Context *c = avctx->priv_data;
+ AVFrame *const p = &c->picture;
+
+ 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 (!pict) {
+ /* 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) {
+ *p = *pict;
+ p->pict_type = AV_PICTURE_TYPE_I;
+ p->key_frame = 1;
+ 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 = pict->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) {
+ req_size = charset_size + c->mc_lifetime*(screen_size + colram_size);
+ if ((ret = ff_alloc_packet2(avctx, pkt, req_size)) < 0)
+ return ret;
+ buf = pkt->data;
+
+ /* calc optimal new charset + charmaps */
+ ff_init_elbg(meta, 32, 1000 * c->mc_lifetime, best_cb, CHARSET_CHARS, 50, charmap, &c->randctx);
+ ff_do_elbg (meta, 32, 1000 * c->mc_lifetime, best_cb, CHARSET_CHARS, 50, charmap, &c->randctx);
+
+ /* 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;
+ charset += 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;
+
+ pkt->size = req_size;
+ pkt->flags |= AV_PKT_FLAG_KEY;
+ *got_packet = !!req_size;
+ }
+ return 0;
+}
+
+#if CONFIG_A64MULTI_ENCODER
+AVCodec ff_a64multi_encoder = {
+ .name = "a64multi",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_A64_MULTI,
+ .priv_data_size = sizeof(A64Context),
+ .init = a64multi_init_encoder,
+ .encode2 = a64multi_encode_frame,
+ .close = a64multi_close_encoder,
+ .pix_fmts = (const enum AVPixelFormat[]) {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE},
+ .long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64"),
+ .capabilities = CODEC_CAP_DELAY,
+};
+#endif
+#if CONFIG_A64MULTI5_ENCODER
+AVCodec ff_a64multi5_encoder = {
+ .name = "a64multi5",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_A64_MULTI5,
+ .priv_data_size = sizeof(A64Context),
+ .init = a64multi_init_encoder,
+ .encode2 = a64multi_encode_frame,
+ .close = a64multi_close_encoder,
+ .pix_fmts = (const enum AVPixelFormat[]) {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE},
+ .long_name = NULL_IF_CONFIG_SMALL("Multicolor charset for Commodore 64, extended with 5th color (colram)"),
+ .capabilities = CODEC_CAP_DELAY,
+};
+#endif
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