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ffmpeg.wasm-core
Commit e2f402f1 authored by Tobias Bindhammer's avatar Tobias Bindhammer
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added interlacing option and compression option for colorram (lut) 

Originally committed as revision 24901 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent eedca998
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Showing with 184 additions and 45 deletions
libavcodec/a64colors.h
View file @ e2f402f1
/*
* a64 video encoder - tables used by 64enc
* a64 video encoder - c64 colors in rgb (Pepto)
* Copyright (c) 2009 Tobias Bindhammer
*
* This file is part of FFmpeg.
......
libavcodec/a64enc.h
View file @ e2f402f1
......@@ -45,8 +45,9 @@ typedef struct A64Context {
int *mc_meta_charset;
int *mc_charmap;
int *mc_best_cb;
int *mc_charset;
int mc_luma_vals[5];
uint8_t *mc_charset;
uint8_t *mc_colram;
} A64Context;
#endif /* AVCODEC_A64ENC_H */
libavcodec/a64multienc.c
View file @ e2f402f1
......@@ -32,10 +32,16 @@
#define DITHERSTEPS 8
#define CHARSET_CHARS 256
#define INTERLACED 1
#define LIFETIME 4
/* 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;
......@@ -66,7 +72,7 @@ static void render_charset(AVCodecContext *avctx, uint8_t *charset,
uint8_t *colrammap)
{
A64Context *c = avctx->priv_data;
uint8_t row1;
uint8_t row1, row2;
int charpos, x, y;
int a, b;
uint8_t pix;
......@@ -97,7 +103,7 @@ static void render_charset(AVCodecContext *avctx, uint8_t *charset,
lowdiff = 0;
highdiff = 0;
for (y = 0; y < 8; y++) {
row1 = 0;
row1 = 0; row2 = 0;
for (x = 0; x < 4; x++) {
pix = best_cb[y * 4 + x];
......@@ -109,12 +115,27 @@ static void render_charset(AVCodecContext *avctx, uint8_t *charset,
row1 <<= 2;
if (multi_dither_patterns[dither[pix]][(y & 3)][x & 3])
row1 |= 3-(index2[pix] & 3);
else
row1 |= 3-(index1[pix] & 3);
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) {
......@@ -133,7 +154,7 @@ static void render_charset(AVCodecContext *avctx, uint8_t *charset,
charset += 8;
/* remember colorram value */
colrammap[charpos] = (highdiff > 0) + 8;
colrammap[charpos] = (highdiff > 0);
}
}
}
......@@ -143,8 +164,9 @@ 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);
av_free(c->mc_charset);
av_free(c->mc_charmap);
av_free(c->mc_colram);
return 0;
}
......@@ -171,10 +193,11 @@ static av_cold int a64multi_init_encoder(AVCodecContext *avctx)
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(CHARSET_CHARS * 32 * sizeof(int));
c->mc_charmap = av_malloc(1000 * c->mc_lifetime * sizeof(int));
c->mc_charset = av_malloc(0x800 * sizeof(uint8_t));
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));
avcodec_get_frame_defaults(&c->picture);
avctx->coded_frame = &c->picture;
......@@ -186,6 +209,21 @@ static av_cold int a64multi_init_encoder(AVCodecContext *avctx)
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)
{
......@@ -196,49 +234,92 @@ static int a64multi_encode_frame(AVCodecContext *avctx, unsigned char *buf,
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;
int num_frames = LIFETIME;
/* 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;
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;
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 AVERROR(EINVAL);
/* 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;
}
/* 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;
/* 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 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, CHARSET_CHARS, 5, charmap, &c->randctx);
ff_do_elbg (meta, 32, 1000 * c-> mc_lifetime, best_cb, CHARSET_CHARS, 5, charmap, &c->randctx);
render_charset(avctx, buf, colrammap);
/* lifetime reached so now convert X frames at once */
if (c->mc_frame_counter == c->mc_lifetime) {
/* 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);
}
req_size = 0;
//XXX this all should maybe move to the muxer? as well as teh chunked/not chunked thing?
/* either write charset as a whole (more comfy when playing from mem) */
/* copy charset chunk if exists */
if(c->mc_lifetime) {
memcpy(buf,charset,0x800*(INTERLACED+1));
buf += 0x800*(INTERLACED+1);
charset += 0x800*(INTERLACED+1);
req_size += 0x800*(INTERLACED+1);
}
else memset(buf,0,0x800*(INTERLACED+1));
/* write x frames to buf */
for (frame = 0; frame < c->mc_lifetime; frame++) {
/* buf is uchar*, charmap is int*, so no memcpy here, sorry */
for (a = 0; a < 1000; a++) {
buf[0x800 + a] = charmap[a];
if (c->mc_use_5col) buf[0xc00 + a] = colrammap[charmap[a]];
buf[a] = charmap[a];
}
buf += frm_size;
buf += 0x400;
req_size += 0x400;
if(c->mc_use_5col) {
a64_compress_colram(buf,charmap,colram);
buf += 0x100;
req_size += 0x100;
}
/* advance to next charmap */
charmap += 1000;
}
/* 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;
......
libavcodec/a64tables.h
View file @ e2f402f1
......@@ -90,4 +90,61 @@ static const uint8_t multi_dither_patterns[9][4][4] = {
},
};
static const uint8_t interlaced_dither_patterns[9][8][4] = {
{
{0, 0, 0, 0}, {0, 0, 0, 0},
{0, 0, 0, 0}, {0, 0, 0, 0},
{0, 0, 0, 0}, {0, 0, 0, 0},
{0, 0, 0, 0}, {0, 0, 0, 0},
},
{
{1, 0, 1, 0}, {0, 0, 0, 0},
{0, 0, 0, 0}, {0, 0, 0, 0},
{1, 0, 1, 0}, {0, 0, 0, 0},
{0, 0, 0, 0}, {0, 0, 0, 0},
},
{
{1, 0, 1, 0}, {0, 0, 0, 0},
{0, 0, 0, 0}, {0, 1, 0, 1},
{1, 0, 1, 0}, {0, 0, 0, 0},
{0, 0, 0, 0}, {0, 1, 0, 1},
},
{
{1, 0, 1, 0}, {0, 1, 0, 1},
{0, 1, 0, 1}, {0, 0, 0, 0},
{1, 0, 1, 0}, {0, 1, 0, 1},
{0, 1, 0, 1}, {0, 0, 0, 0},
},
{
{1, 0, 1, 0}, {0, 1, 0, 1},
{0, 1, 0, 1}, {1, 0, 1, 0},
{1, 0, 1, 0}, {0, 1, 0, 1},
{0, 1, 0, 1}, {1, 0, 1, 0},
},
{
{1, 0, 1, 0}, {0, 1, 0, 1},
{1, 1, 1, 1}, {1, 0, 1, 0},
{1, 0, 1, 0}, {0, 1, 0, 1},
{1, 1, 1, 1}, {1, 0, 1, 0},
},
{
{1, 0, 1, 0}, {1, 1, 1, 1},
{1, 1, 1, 1}, {0, 1, 0, 1},
{1, 0, 1, 0}, {1, 1, 1, 1},
{1, 1, 1, 1}, {0, 1, 0, 1},
},
{
{1, 1, 1, 1}, {1, 1, 1, 1},
{1, 1, 1, 1}, {0, 1, 0, 1},
{1, 1, 1, 1}, {1, 1, 1, 1},
{1, 1, 1, 1}, {0, 1, 0, 1},
},
{
{1, 1, 1, 1}, {1, 1, 1, 1},
{1, 1, 1, 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 */
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