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support ifr2 from Toy-Story2_better-image-quality.4xa

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Originally committed as revision 10091 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-08-12 15:47:27 +00:00
parent 3ca96802e2
commit b74fb935f8
1 changed files with 48 additions and 1 deletions
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49
libavcodec/4xm.c
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@ -575,6 +575,49 @@ static uint8_t *read_huffman_tables(FourXContext *f, uint8_t * const buf){
return ptr;
}
static int mix(int c0, int c1){
int blue = 2*(c0&0x001F) + (c1&0x001F);
int green= (2*(c0&0x03E0) + (c1&0x03E0))>>5;
int red = 2*(c0>>10) + (c1>>10);
return red/3*1024 + green/3*32 + blue/3;
}
static int decode_i2_frame(FourXContext *f, uint8_t *buf, int length){
int x, y, x2, y2;
const int width= f->avctx->width;
const int height= f->avctx->height;
uint16_t *dst= (uint16_t*)f->current_picture.data[0];
const int stride= f->current_picture.linesize[0]>>1;
for(y=0; y<height; y+=16){
for(x=0; x<width; x+=16){
unsigned int color[4], bits;
memset(color, 0, sizeof(color));
//warning following is purely guessed ...
color[0]= AV_RN16(buf); buf+=2; //FIXME use bytestream
color[1]= AV_RN16(buf); buf+=2;
if(color[0]&0x8000) av_log(NULL, AV_LOG_ERROR, "unk bit 1\n");
if(color[1]&0x8000) av_log(NULL, AV_LOG_ERROR, "unk bit 2\n");
color[2]= mix(color[0], color[1]);
color[3]= mix(color[1], color[0]);
bits= AV_RL32(buf); buf+= 4;
for(y2=0; y2<16; y2++){
for(x2=0; x2<16; x2++){
int index= 2*(x2>>2) + 8*(y2>>2);
dst[y2*stride+x2]= color[(bits>>index)&3];
}
}
dst+=16;
}
dst += 16*stride - width;
}
return 0;
}
static int decode_i_frame(FourXContext *f, uint8_t *buf, int length){
int x, y;
const int width= f->avctx->width;
@ -702,7 +745,11 @@ static int decode_frame(AVCodecContext *avctx,
return -1;
}
if(frame_4cc == ff_get_fourcc("ifrm") || frame_4cc == ff_get_fourcc("ifr2")){
if(frame_4cc == ff_get_fourcc("ifr2")){
p->pict_type= I_TYPE;
if(decode_i2_frame(f, buf-4, frame_size) < 0)
return -1;
}else if(frame_4cc == ff_get_fourcc("ifrm")){
p->pict_type= I_TYPE;
if(decode_i_frame(f, buf, frame_size) < 0)
return -1;