/* * 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 "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); 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) 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; } AVCodec ff_ulti_decoder = { .name = "ultimotion", .long_name = NULL_IF_CONFIG_SMALL("IBM UltiMotion"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_ULTI, .priv_data_size = sizeof(UltimotionDecodeContext), .init = ulti_decode_init, .close = ulti_decode_end, .decode = ulti_decode_frame, .capabilities = AV_CODEC_CAP_DR1, };