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ffmpeg/libavcodec/ulti.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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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 "codec_internal.h"
#include "internal.h"
#include "ulti_cb.h"
typedef struct UltimotionDecodeContext {
AVCodecContext *avctx;
int width, height, blocks;
AVFrame *frame;
const uint8_t *ulti_codebook;
GetByteContext gb;
} 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);
if (s->blocks == 0)
return AVERROR_INVALIDDATA;
avctx->pix_fmt = AV_PIX_FMT_YUV410P;
s->ulti_codebook = ulti_codebook;
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
return 0;
}
static av_cold int ulti_decode_end(AVCodecContext *avctx)
{
UltimotionDecodeContext *s = avctx->priv_data;
av_frame_free(&s->frame);
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 *got_frame,
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, ret;
int skip;
int tmp;
if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
return ret;
bytestream2_init(&s->gb, buf, buf_size);
while(!done) {
int idx;
if(blocks >= s->blocks || y >= s->height)
break;//all blocks decoded
if (bytestream2_get_bytes_left(&s->gb) < 1)
goto err;
idx = bytestream2_get_byteu(&s->gb);
if((idx & 0xF8) == 0x70) {
switch(idx) {
case 0x70: //change modifier
modifier = bytestream2_get_byte(&s->gb);
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 = bytestream2_get_byte(&s->gb);
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 = bytestream2_get_byte(&s->gb);
}
}
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 = bytestream2_get_byte(&s->gb);
}
tx = x + block_coords[i * 2];
ty = y + block_coords[(i * 2) + 1];
switch(code) {
case 1:
tmp = bytestream2_get_byte(&s->gb);
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 = bytestream2_get_be24(&s->gb);
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 = bytestream2_get_be16(&s->gb);
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];
if (bytestream2_get_bytes_left(&s->gb) < 12)
goto err;
tmp = bytestream2_get_be24u(&s->gb);
Luma[0] = (tmp >> 18) & 0x3F;
Luma[1] = (tmp >> 12) & 0x3F;
Luma[2] = (tmp >> 6) & 0x3F;
Luma[3] = tmp & 0x3F;
tmp = bytestream2_get_be24u(&s->gb);
Luma[4] = (tmp >> 18) & 0x3F;
Luma[5] = (tmp >> 12) & 0x3F;
Luma[6] = (tmp >> 6) & 0x3F;
Luma[7] = tmp & 0x3F;
tmp = bytestream2_get_be24u(&s->gb);
Luma[8] = (tmp >> 18) & 0x3F;
Luma[9] = (tmp >> 12) & 0x3F;
Luma[10] = (tmp >> 6) & 0x3F;
Luma[11] = tmp & 0x3F;
tmp = bytestream2_get_be24u(&s->gb);
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 {
if (bytestream2_get_bytes_left(&s->gb) < 4)
goto err;
tmp = bytestream2_get_byteu(&s->gb);
if(tmp & 0x80) {
angle = (tmp >> 4) & 0x7;
tmp = (tmp << 8) + bytestream2_get_byteu(&s->gb);
Y[0] = (tmp >> 6) & 0x3F;
Y[1] = tmp & 0x3F;
Y[2] = bytestream2_get_byteu(&s->gb) & 0x3F;
Y[3] = bytestream2_get_byteu(&s->gb) & 0x3F;
ulti_grad(s->frame, tx, ty, Y, chroma, angle); //draw block
} else { // some patterns
int f0 = tmp;
int f1 = bytestream2_get_byteu(&s->gb);
Y[0] = bytestream2_get_byteu(&s->gb) & 0x3F;
Y[1] = bytestream2_get_byteu(&s->gb) & 0x3F;
ulti_pattern(s->frame, tx, ty, f0, f1, 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;
}
}
}
*got_frame = 1;
if ((ret = av_frame_ref(data, s->frame)) < 0)
return ret;
return buf_size;
err:
av_log(avctx, AV_LOG_ERROR,
"Insufficient data\n");
return AVERROR_INVALIDDATA;
}
const FFCodec ff_ulti_decoder = {
.p.name = "ultimotion",
.p.long_name = NULL_IF_CONFIG_SMALL("IBM UltiMotion"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_ULTI,
.priv_data_size = sizeof(UltimotionDecodeContext),
.init = ulti_decode_init,
.close = ulti_decode_end,
.decode = ulti_decode_frame,
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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