ffmpeg source update for sep 09

source/patched-ffmpeg-mt/libavcodec/a64multienc.c

+/*
+ * 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 "a64colors.h"
+#include "a64tables.h"
+#include "elbg.h"
+#include "libavutil/intreadwrite.h"
+
+#define DITHERSTEPS   8
+#define CHARSET_CHARS 256
+#define INTERLACED    1
+
+/* 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 < 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, 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 < 4 && 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 >=4 ) dither[a] = 0;
+        index1[a] = i;
+        index2[a] = FFMIN(i+1, 4);
+    }
+    /* 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) {
+            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);
+
+    /* precalc luma values for later use */
+    for (a = 0; a < 5; 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;
+    }
+
+    c->mc_frame_counter = 0;
+    c->mc_use_5col      = avctx->codec->id == CODEC_ID_A64_MULTI5;
+
+    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 = FF_I_TYPE;
+    avctx->coded_frame->key_frame = 1;
+    if (!avctx->codec_tag)
+         avctx->codec_tag = AV_RL32("a64m");
+
+    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, 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;
+
+    int req_size;
+    int num_frames = c->mc_lifetime;
+
+    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 screen_size  = 0x400;
+    int colram_size  = 0x100 * c->mc_use_5col;
+
+    /* no data, means end encoding asap */
+    if (!data) {
+        /* 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) {
+            num_frames=c->mc_lifetime;
+            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 = 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 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) {
+            /* 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;
+            req_size += charset_size;
+        }
+        /* no charset so clean buf */
+        else memset(buf, 0, 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 (a = 0; a < 1000; a++) {
+                buf[a] = charmap[a];
+            }
+            /* 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;
+
+        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;
+        }
+        return req_size;
+    }
+    return 0;
+}
+
+AVCodec a64multi_encoder = {
+    .name           = "a64multi",
+    .type           = AVMEDIA_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           = AVMEDIA_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,
+};