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FFmpeg/libavcodec/ulti.c

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/*
* IBM Ultimotion Video Decoder
* Copyright (C) 2004 Konstantin Shishkov
*
* 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
* IBM Ultimotion Video Decoder.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "avcodec.h"
#include "bytestream.h"
#include "ulti_cb.h"
typedef struct UltimotionDecodeContext {
AVCodecContext *avctx;
int width, height, blocks;
AVFrame frame;
const uint8_t *ulti_codebook;
} UltimotionDecodeContext;
static av_cold int ulti_decode_init(AVCodecContext *avctx)
{
UltimotionDecodeContext *s = avctx->priv_data;
s->avctx = avctx;
s->width = avctx->width;
s->height = avctx->height;
s->blocks = (s->width / 8) * (s->height / 8);
avctx->pix_fmt = PIX_FMT_YUV410P;
avcodec_get_frame_defaults(&s->frame);
avctx->coded_frame = (AVFrame*) &s->frame;
s->ulti_codebook = ulti_codebook;
return 0;
}
static av_cold int ulti_decode_end(AVCodecContext *avctx){
UltimotionDecodeContext *s = avctx->priv_data;
AVFrame *pic = &s->frame;
if (pic->data[0])
avctx->release_buffer(avctx, pic);
return 0;
}
static const int block_coords[8] = // 4x4 block coords in 8x8 superblock
{ 0, 0, 0, 4, 4, 4, 4, 0};
static const int angle_by_index[4] = { 0, 2, 6, 12};
/* Lookup tables for luma and chroma - used by ulti_convert_yuv() */
static const uint8_t ulti_lumas[64] =
{ 0x10, 0x13, 0x17, 0x1A, 0x1E, 0x21, 0x25, 0x28,
0x2C, 0x2F, 0x33, 0x36, 0x3A, 0x3D, 0x41, 0x44,
0x48, 0x4B, 0x4F, 0x52, 0x56, 0x59, 0x5C, 0x60,
0x63, 0x67, 0x6A, 0x6E, 0x71, 0x75, 0x78, 0x7C,
0x7F, 0x83, 0x86, 0x8A, 0x8D, 0x91, 0x94, 0x98,
0x9B, 0x9F, 0xA2, 0xA5, 0xA9, 0xAC, 0xB0, 0xB3,
0xB7, 0xBA, 0xBE, 0xC1, 0xC5, 0xC8, 0xCC, 0xCF,
0xD3, 0xD6, 0xDA, 0xDD, 0xE1, 0xE4, 0xE8, 0xEB};
static const uint8_t ulti_chromas[16] =
{ 0x60, 0x67, 0x6D, 0x73, 0x7A, 0x80, 0x86, 0x8D,
0x93, 0x99, 0xA0, 0xA6, 0xAC, 0xB3, 0xB9, 0xC0};
/* convert Ultimotion YUV block (sixteen 6-bit Y samples and
two 4-bit chroma samples) into standard YUV and put it into frame */
static void ulti_convert_yuv(AVFrame *frame, int x, int y,
uint8_t *luma,int chroma)
{
uint8_t *y_plane, *cr_plane, *cb_plane;
int i;
y_plane = frame->data[0] + x + y * frame->linesize[0];
cr_plane = frame->data[1] + (x / 4) + (y / 4) * frame->linesize[1];
cb_plane = frame->data[2] + (x / 4) + (y / 4) * frame->linesize[2];
cr_plane[0] = ulti_chromas[chroma >> 4];
cb_plane[0] = ulti_chromas[chroma & 0xF];
for(i = 0; i < 16; i++){
y_plane[i & 3] = ulti_lumas[luma[i]];
if((i & 3) == 3) { //next row
y_plane += frame->linesize[0];
}
}
}
/* generate block like in MS Video1 */
static void ulti_pattern(AVFrame *frame, int x, int y,
int f0, int f1, int Y0, int Y1, int chroma)
{
uint8_t Luma[16];
int mask, i;
for(mask = 0x80, i = 0; mask; mask >>= 1, i++) {
if(f0 & mask)
Luma[i] = Y1;
else
Luma[i] = Y0;
}
for(mask = 0x80, i = 8; mask; mask >>= 1, i++) {
if(f1 & mask)
Luma[i] = Y1;
else
Luma[i] = Y0;
}
ulti_convert_yuv(frame, x, y, Luma, chroma);
}
/* fill block with some gradient */
static void ulti_grad(AVFrame *frame, int x, int y, uint8_t *Y, int chroma, int angle)
{
uint8_t Luma[16];
if(angle & 8) { //reverse order
int t;
angle &= 0x7;
t = Y[0];
Y[0] = Y[3];
Y[3] = t;
t = Y[1];
Y[1] = Y[2];
Y[2] = t;
}
switch(angle){
case 0:
Luma[0] = Y[0]; Luma[1] = Y[1]; Luma[2] = Y[2]; Luma[3] = Y[3];
Luma[4] = Y[0]; Luma[5] = Y[1]; Luma[6] = Y[2]; Luma[7] = Y[3];
Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
Luma[12] = Y[0]; Luma[13] = Y[1]; Luma[14] = Y[2]; Luma[15] = Y[3];
break;
case 1:
Luma[0] = Y[1]; Luma[1] = Y[2]; Luma[2] = Y[3]; Luma[3] = Y[3];
Luma[4] = Y[0]; Luma[5] = Y[1]; Luma[6] = Y[2]; Luma[7] = Y[3];
Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
break;
case 2:
Luma[0] = Y[1]; Luma[1] = Y[2]; Luma[2] = Y[3]; Luma[3] = Y[3];
Luma[4] = Y[1]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[3];
Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
break;
case 3:
Luma[0] = Y[2]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[3];
Luma[4] = Y[1]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[3];
Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[1];
break;
case 4:
Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[3];
Luma[4] = Y[2]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[2];
Luma[8] = Y[1]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[1];
Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
break;
case 5:
Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[2];
Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[1];
Luma[8] = Y[2]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[0];
Luma[12] = Y[1]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
break;
case 6:
Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[2]; Luma[3] = Y[2];
Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[1]; Luma[7] = Y[1];
Luma[8] = Y[2]; Luma[9] = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
Luma[12] = Y[1]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
break;
case 7:
Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[2]; Luma[3] = Y[1];
Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[1]; Luma[7] = Y[0];
Luma[8] = Y[3]; Luma[9] = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
Luma[12] = Y[2]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
break;
default:
Luma[0] = Y[0]; Luma[1] = Y[0]; Luma[2] = Y[1]; Luma[3] = Y[1];
Luma[4] = Y[0]; Luma[5] = Y[0]; Luma[6] = Y[1]; Luma[7] = Y[1];
Luma[8] = Y[2]; Luma[9] = Y[2]; Luma[10] = Y[3]; Luma[11] = Y[3];
Luma[12] = Y[2]; Luma[13] = Y[2]; Luma[14] = Y[3]; Luma[15] = Y[3];
break;
}
ulti_convert_yuv(frame, x, y, Luma, chroma);
}
static int ulti_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
UltimotionDecodeContext *s=avctx->priv_data;
int modifier = 0;
int uniq = 0;
int mode = 0;
int blocks = 0;
int done = 0;
int x = 0, y = 0;
int i;
int skip;
int tmp;
s->frame.reference = 3;
s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
if (avctx->reget_buffer(avctx, &s->frame) < 0) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return -1;
}
while(!done) {
int idx;
if(blocks >= s->blocks || y >= s->height)
break;//all blocks decoded
idx = *buf++;
if((idx & 0xF8) == 0x70) {
switch(idx) {
case 0x70: //change modifier
modifier = *buf++;
if(modifier>1)
av_log(avctx, AV_LOG_INFO, "warning: modifier must be 0 or 1, got %i\n", modifier);
break;
case 0x71: // set uniq flag
uniq = 1;
break;
case 0x72: //toggle mode
mode = !mode;
break;
case 0x73: //end-of-frame
done = 1;
break;
case 0x74: //skip some blocks
skip = *buf++;
if ((blocks + skip) >= s->blocks)
break;
blocks += skip;
x += skip * 8;
while(x >= s->width) {
x -= s->width;
y += 8;
}
break;
default:
av_log(avctx, AV_LOG_INFO, "warning: unknown escape 0x%02X\n", idx);
}
} else { //handle one block
int code;
int cf;
int angle = 0;
uint8_t Y[4]; // luma samples of block
int tx = 0, ty = 0; //coords of subblock
int chroma = 0;
if (mode || uniq) {
uniq = 0;
cf = 1;
chroma = 0;
} else {
cf = 0;
if (idx)
chroma = *buf++;
}
for (i = 0; i < 4; i++) { // for every subblock
code = (idx >> (6 - i*2)) & 3; //extract 2 bits
if(!code) //skip subblock
continue;
if(cf)
chroma = *buf++;
tx = x + block_coords[i * 2];
ty = y + block_coords[(i * 2) + 1];
switch(code) {
case 1:
tmp = *buf++;
angle = angle_by_index[(tmp >> 6) & 0x3];
Y[0] = tmp & 0x3F;
Y[1] = Y[0];
if (angle) {
Y[2] = Y[0]+1;
if (Y[2] > 0x3F)
Y[2] = 0x3F;
Y[3] = Y[2];
} else {
Y[2] = Y[0];
Y[3] = Y[0];
}
break;
case 2:
if (modifier) { // unpack four luma samples
tmp = bytestream_get_be24(&buf);
Y[0] = (tmp >> 18) & 0x3F;
Y[1] = (tmp >> 12) & 0x3F;
Y[2] = (tmp >> 6) & 0x3F;
Y[3] = tmp & 0x3F;
angle = 16;
} else { // retrieve luma samples from codebook
tmp = bytestream_get_be16(&buf);
angle = (tmp >> 12) & 0xF;
tmp &= 0xFFF;
tmp <<= 2;
Y[0] = s->ulti_codebook[tmp];
Y[1] = s->ulti_codebook[tmp + 1];
Y[2] = s->ulti_codebook[tmp + 2];
Y[3] = s->ulti_codebook[tmp + 3];
}
break;
case 3:
if (modifier) { // all 16 luma samples
uint8_t Luma[16];
tmp = bytestream_get_be24(&buf);
Luma[0] = (tmp >> 18) & 0x3F;
Luma[1] = (tmp >> 12) & 0x3F;
Luma[2] = (tmp >> 6) & 0x3F;
Luma[3] = tmp & 0x3F;
tmp = bytestream_get_be24(&buf);
Luma[4] = (tmp >> 18) & 0x3F;
Luma[5] = (tmp >> 12) & 0x3F;
Luma[6] = (tmp >> 6) & 0x3F;
Luma[7] = tmp & 0x3F;
tmp = bytestream_get_be24(&buf);
Luma[8] = (tmp >> 18) & 0x3F;
Luma[9] = (tmp >> 12) & 0x3F;
Luma[10] = (tmp >> 6) & 0x3F;
Luma[11] = tmp & 0x3F;
tmp = bytestream_get_be24(&buf);
Luma[12] = (tmp >> 18) & 0x3F;
Luma[13] = (tmp >> 12) & 0x3F;
Luma[14] = (tmp >> 6) & 0x3F;
Luma[15] = tmp & 0x3F;
ulti_convert_yuv(&s->frame, tx, ty, Luma, chroma);
} else {
tmp = *buf++;
if(tmp & 0x80) {
angle = (tmp >> 4) & 0x7;
tmp = (tmp << 8) + *buf++;
Y[0] = (tmp >> 6) & 0x3F;
Y[1] = tmp & 0x3F;
Y[2] = (*buf++) & 0x3F;
Y[3] = (*buf++) & 0x3F;
ulti_grad(&s->frame, tx, ty, Y, chroma, angle); //draw block
} else { // some patterns
int f0, f1;
f0 = *buf++;
f1 = tmp;
Y[0] = (*buf++) & 0x3F;
Y[1] = (*buf++) & 0x3F;
ulti_pattern(&s->frame, tx, ty, f1, f0, Y[0], Y[1], chroma);
}
}
break;
}
if(code != 3)
ulti_grad(&s->frame, tx, ty, Y, chroma, angle); // draw block
}
blocks++;
x += 8;
if(x >= s->width) {
x = 0;
y += 8;
}
}
}
*data_size=sizeof(AVFrame);
*(AVFrame*)data= s->frame;
return buf_size;
}
AVCodec ff_ulti_decoder = {
.name = "ultimotion",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_ULTI,
.priv_data_size = sizeof(UltimotionDecodeContext),
.init = ulti_decode_init,
.close = ulti_decode_end,
.decode = ulti_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("IBM UltiMotion"),
};