ffmpeg / libavcodec / ulti.c @ d36beb3f
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/*


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* IBM Ultimotion Video Decoder

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* Copyright (C) 2004 Konstantin Shishkov

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*

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* This file is part of FFmpeg.

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*

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* FFmpeg is free software; you can redistribute it and/or

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* modify it under the terms of the GNU Lesser General Public

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* License as published by the Free Software Foundation; either

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* version 2.1 of the License, or (at your option) any later version.

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*

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* FFmpeg is distributed in the hope that it will be useful,

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* but WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* Lesser General Public License for more details.

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*

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* You should have received a copy of the GNU Lesser General Public

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* License along with FFmpeg; if not, write to the Free Software

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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 021101301 USA

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*/

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/**

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* @file

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* IBM Ultimotion Video Decoder.

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*/

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#include <stdio.h> 
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#include <stdlib.h> 
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#include <string.h> 
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#include "avcodec.h" 
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#include "bytestream.h" 
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#include "ulti_cb.h" 
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typedef struct UltimotionDecodeContext { 
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AVCodecContext *avctx; 
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int width, height, blocks;

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AVFrame frame; 
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const uint8_t *ulti_codebook;

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} UltimotionDecodeContext; 
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static av_cold int ulti_decode_init(AVCodecContext *avctx) 
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{ 
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UltimotionDecodeContext *s = avctx>priv_data; 
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s>avctx = avctx; 
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s>width = avctx>width; 
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s>height = avctx>height; 
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s>blocks = (s>width / 8) * (s>height / 8); 
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avctx>pix_fmt = PIX_FMT_YUV410P; 
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avctx>coded_frame = (AVFrame*) &s>frame; 
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s>ulti_codebook = ulti_codebook; 
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return 0; 
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} 
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static av_cold int ulti_decode_end(AVCodecContext *avctx){ 
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UltimotionDecodeContext *s = avctx>priv_data; 
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AVFrame *pic = &s>frame; 
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if (pic>data[0]) 
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avctx>release_buffer(avctx, pic); 
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return 0; 
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} 
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static const int block_coords[8] = // 4x4 block coords in 8x8 superblock 
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{ 0, 0, 0, 4, 4, 4, 4, 0}; 
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static const int angle_by_index[4] = { 0, 2, 6, 12}; 
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/* Lookup tables for luma and chroma  used by ulti_convert_yuv() */

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static const uint8_t ulti_lumas[64] = 
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{ 0x10, 0x13, 0x17, 0x1A, 0x1E, 0x21, 0x25, 0x28, 
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0x2C, 0x2F, 0x33, 0x36, 0x3A, 0x3D, 0x41, 0x44, 
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0x48, 0x4B, 0x4F, 0x52, 0x56, 0x59, 0x5C, 0x60, 
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0x63, 0x67, 0x6A, 0x6E, 0x71, 0x75, 0x78, 0x7C, 
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0x7F, 0x83, 0x86, 0x8A, 0x8D, 0x91, 0x94, 0x98, 
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0x9B, 0x9F, 0xA2, 0xA5, 0xA9, 0xAC, 0xB0, 0xB3, 
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0xB7, 0xBA, 0xBE, 0xC1, 0xC5, 0xC8, 0xCC, 0xCF, 
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0xD3, 0xD6, 0xDA, 0xDD, 0xE1, 0xE4, 0xE8, 0xEB}; 
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static const uint8_t ulti_chromas[16] = 
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{ 0x60, 0x67, 0x6D, 0x73, 0x7A, 0x80, 0x86, 0x8D, 
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0x93, 0x99, 0xA0, 0xA6, 0xAC, 0xB3, 0xB9, 0xC0}; 
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/* convert Ultimotion YUV block (sixteen 6bit Y samples and

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two 4bit chroma samples) into standard YUV and put it into frame */

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static void ulti_convert_yuv(AVFrame *frame, int x, int y, 
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uint8_t *luma,int chroma)

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{ 
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uint8_t *y_plane, *cr_plane, *cb_plane; 
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int i;

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y_plane = frame>data[0] + x + y * frame>linesize[0]; 
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cr_plane = frame>data[1] + (x / 4) + (y / 4) * frame>linesize[1]; 
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cb_plane = frame>data[2] + (x / 4) + (y / 4) * frame>linesize[2]; 
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cr_plane[0] = ulti_chromas[chroma >> 4]; 
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cb_plane[0] = ulti_chromas[chroma & 0xF]; 
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for(i = 0; i < 16; i++){ 
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y_plane[i & 3] = ulti_lumas[luma[i]];

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if((i & 3) == 3) { //next row 
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y_plane += frame>linesize[0];

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} 
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} 
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} 
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/* generate block like in MS Video1 */

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static void ulti_pattern(AVFrame *frame, int x, int y, 
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int f0, int f1, int Y0, int Y1, int chroma) 
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{ 
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uint8_t Luma[16];

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int mask, i;

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for(mask = 0x80, i = 0; mask; mask >>= 1, i++) { 
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if(f0 & mask)

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Luma[i] = Y1; 
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else

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Luma[i] = Y0; 
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} 
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for(mask = 0x80, i = 8; mask; mask >>= 1, i++) { 
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if(f1 & mask)

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Luma[i] = Y1; 
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else

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Luma[i] = Y0; 
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} 
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ulti_convert_yuv(frame, x, y, Luma, chroma); 
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} 
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/* fill block with some gradient */

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static void ulti_grad(AVFrame *frame, int x, int y, uint8_t *Y, int chroma, int angle) 
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{ 
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uint8_t Luma[16];

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if(angle & 8) { //reverse order 
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int t;

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angle &= 0x7;

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t = Y[0];

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Y[0] = Y[3]; 
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Y[3] = t;

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t = Y[1];

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Y[1] = Y[2]; 
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Y[2] = t;

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} 
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switch(angle){

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case 0: 
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Luma[0] = Y[0]; Luma[1] = Y[1]; Luma[2] = Y[2]; Luma[3] = Y[3]; 
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Luma[4] = Y[0]; Luma[5] = Y[1]; Luma[6] = Y[2]; Luma[7] = Y[3]; 
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Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3]; 
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Luma[12] = Y[0]; Luma[13] = Y[1]; Luma[14] = Y[2]; Luma[15] = Y[3]; 
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break;

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case 1: 
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Luma[0] = Y[1]; Luma[1] = Y[2]; Luma[2] = Y[3]; Luma[3] = Y[3]; 
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Luma[4] = Y[0]; Luma[5] = Y[1]; Luma[6] = Y[2]; Luma[7] = Y[3]; 
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Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3]; 
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Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2]; 
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break;

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case 2: 
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Luma[0] = Y[1]; Luma[1] = Y[2]; Luma[2] = Y[3]; Luma[3] = Y[3]; 
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Luma[4] = Y[1]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[3]; 
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Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2]; 
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Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2]; 
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break;

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case 3: 
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Luma[0] = Y[2]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[3]; 
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Luma[4] = Y[1]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[3]; 
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Luma[8] = Y[0]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2]; 
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Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[1]; 
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break;

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case 4: 
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Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[3]; 
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Luma[4] = Y[2]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[2]; 
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Luma[8] = Y[1]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[1]; 
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Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0]; 
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break;

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case 5: 
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Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[3]; Luma[3] = Y[2]; 
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Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[2]; Luma[7] = Y[1]; 
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Luma[8] = Y[2]; Luma[9] = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[0]; 
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Luma[12] = Y[1]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0]; 
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break;

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case 6: 
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Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[2]; Luma[3] = Y[2]; 
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Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[1]; Luma[7] = Y[1]; 
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Luma[8] = Y[2]; Luma[9] = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0]; 
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Luma[12] = Y[1]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0]; 
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break;

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case 7: 
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Luma[0] = Y[3]; Luma[1] = Y[3]; Luma[2] = Y[2]; Luma[3] = Y[1]; 
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Luma[4] = Y[3]; Luma[5] = Y[2]; Luma[6] = Y[1]; Luma[7] = Y[0]; 
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Luma[8] = Y[3]; Luma[9] = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0]; 
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Luma[12] = Y[2]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0]; 
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break;

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default:

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Luma[0] = Y[0]; Luma[1] = Y[0]; Luma[2] = Y[1]; Luma[3] = Y[1]; 
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Luma[4] = Y[0]; Luma[5] = Y[0]; Luma[6] = Y[1]; Luma[7] = Y[1]; 
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Luma[8] = Y[2]; Luma[9] = Y[2]; Luma[10] = Y[3]; Luma[11] = Y[3]; 
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Luma[12] = Y[2]; Luma[13] = Y[2]; Luma[14] = Y[3]; Luma[15] = Y[3]; 
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break;

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} 
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ulti_convert_yuv(frame, x, y, Luma, chroma); 
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} 
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static int ulti_decode_frame(AVCodecContext *avctx, 
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void *data, int *data_size, 
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AVPacket *avpkt) 
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{ 
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const uint8_t *buf = avpkt>data;

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int buf_size = avpkt>size;

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UltimotionDecodeContext *s=avctx>priv_data; 
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int modifier = 0; 
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int uniq = 0; 
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int mode = 0; 
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int blocks = 0; 
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int done = 0; 
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int x = 0, y = 0; 
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int i;

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int skip;

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int tmp;

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if(s>frame.data[0]) 
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avctx>release_buffer(avctx, &s>frame); 
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s>frame.reference = 1;

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s>frame.buffer_hints = FF_BUFFER_HINTS_VALID  FF_BUFFER_HINTS_PRESERVE  FF_BUFFER_HINTS_REUSABLE; 
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if(avctx>get_buffer(avctx, &s>frame) < 0) { 
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

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return 1; 
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} 
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while(!done) {

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int idx;

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if(blocks >= s>blocks  y >= s>height)

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break;//all blocks decoded 
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idx = *buf++; 
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if((idx & 0xF8) == 0x70) { 
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switch(idx) {

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case 0x70: //change modifier 
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modifier = *buf++; 
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if(modifier>1) 
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av_log(avctx, AV_LOG_INFO, "warning: modifier must be 0 or 1, got %i\n", modifier);

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break;

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case 0x71: // set uniq flag 
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uniq = 1;

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break;

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case 0x72: //toggle mode 
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mode = !mode; 
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break;

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case 0x73: //endofframe 
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done = 1;

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break;

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case 0x74: //skip some blocks 
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skip = *buf++; 
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if ((blocks + skip) >= s>blocks)

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break;

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blocks += skip; 
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x += skip * 8;

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while(x >= s>width) {

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x = s>width; 
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y += 8;

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} 
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break;

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default:

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av_log(avctx, AV_LOG_INFO, "warning: unknown escape 0x%02X\n", idx);

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} 
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} else { //handle one block 
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int code;

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int cf;

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int angle = 0; 
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uint8_t Y[4]; // luma samples of block 
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int tx = 0, ty = 0; //coords of subblock 
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int chroma = 0; 
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if (mode  uniq) {

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uniq = 0;

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cf = 1;

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chroma = 0;

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} else {

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cf = 0;

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if (idx)

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chroma = *buf++; 
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} 
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for (i = 0; i < 4; i++) { // for every subblock 
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code = (idx >> (6  i*2)) & 3; //extract 2 bits 
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if(!code) //skip subblock 
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continue;

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if(cf)

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chroma = *buf++; 
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tx = x + block_coords[i * 2];

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ty = y + block_coords[(i * 2) + 1]; 
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switch(code) {

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case 1: 
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tmp = *buf++; 
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angle = angle_by_index[(tmp >> 6) & 0x3]; 
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Y[0] = tmp & 0x3F; 
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Y[1] = Y[0]; 
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if (angle) {

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Y[2] = Y[0]+1; 
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if (Y[2] > 0x3F) 
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Y[2] = 0x3F; 
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Y[3] = Y[2]; 
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} else {

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Y[2] = Y[0]; 
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Y[3] = Y[0]; 
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} 
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break;

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case 2: 
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if (modifier) { // unpack four luma samples 
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tmp = bytestream_get_be24(&buf); 
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Y[0] = (tmp >> 18) & 0x3F; 
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Y[1] = (tmp >> 12) & 0x3F; 
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Y[2] = (tmp >> 6) & 0x3F; 
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Y[3] = tmp & 0x3F; 
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angle = 16;

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} else { // retrieve luma samples from codebook 
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tmp = bytestream_get_be16(&buf); 
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angle = (tmp >> 12) & 0xF; 
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tmp &= 0xFFF;

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tmp <<= 2;

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Y[0] = s>ulti_codebook[tmp];

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Y[1] = s>ulti_codebook[tmp + 1]; 
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Y[2] = s>ulti_codebook[tmp + 2]; 
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Y[3] = s>ulti_codebook[tmp + 3]; 
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} 
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break;

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case 3: 
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if (modifier) { // all 16 luma samples 
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uint8_t Luma[16];

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tmp = bytestream_get_be24(&buf); 
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Luma[0] = (tmp >> 18) & 0x3F; 
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Luma[1] = (tmp >> 12) & 0x3F; 
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Luma[2] = (tmp >> 6) & 0x3F; 
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Luma[3] = tmp & 0x3F; 
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tmp = bytestream_get_be24(&buf); 
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Luma[4] = (tmp >> 18) & 0x3F; 
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Luma[5] = (tmp >> 12) & 0x3F; 
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Luma[6] = (tmp >> 6) & 0x3F; 
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Luma[7] = tmp & 0x3F; 
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tmp = bytestream_get_be24(&buf); 
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Luma[8] = (tmp >> 18) & 0x3F; 
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Luma[9] = (tmp >> 12) & 0x3F; 
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Luma[10] = (tmp >> 6) & 0x3F; 
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Luma[11] = tmp & 0x3F; 
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tmp = bytestream_get_be24(&buf); 
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Luma[12] = (tmp >> 18) & 0x3F; 
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Luma[13] = (tmp >> 12) & 0x3F; 
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Luma[14] = (tmp >> 6) & 0x3F; 
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Luma[15] = tmp & 0x3F; 
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ulti_convert_yuv(&s>frame, tx, ty, Luma, chroma); 
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} else {

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tmp = *buf++; 
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if(tmp & 0x80) { 
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angle = (tmp >> 4) & 0x7; 
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tmp = (tmp << 8) + *buf++;

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Y[0] = (tmp >> 6) & 0x3F; 
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Y[1] = tmp & 0x3F; 
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Y[2] = (*buf++) & 0x3F; 
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Y[3] = (*buf++) & 0x3F; 
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ulti_grad(&s>frame, tx, ty, Y, chroma, angle); //draw block

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} else { // some patterns 
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int f0, f1;

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f0 = *buf++; 
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f1 = tmp; 
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Y[0] = (*buf++) & 0x3F; 
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Y[1] = (*buf++) & 0x3F; 
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ulti_pattern(&s>frame, tx, ty, f1, f0, Y[0], Y[1], chroma); 
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} 
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} 
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break;

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} 
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if(code != 3) 
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ulti_grad(&s>frame, tx, ty, Y, chroma, angle); // draw block

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} 
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blocks++; 
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x += 8;

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if(x >= s>width) {

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x = 0;

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y += 8;

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} 
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} 
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} 
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*data_size=sizeof(AVFrame);

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*(AVFrame*)data= s>frame; 
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return buf_size;

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} 
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AVCodec ff_ulti_decoder = { 
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"ultimotion",

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AVMEDIA_TYPE_VIDEO, 
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CODEC_ID_ULTI, 
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sizeof(UltimotionDecodeContext),

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ulti_decode_init, 
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NULL,

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ulti_decode_end, 
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ulti_decode_frame, 
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CODEC_CAP_DR1, 
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NULL,

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.long_name = NULL_IF_CONFIG_SMALL("IBM UltiMotion"),

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}; 
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