| /* |
| * 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 libavcodec/ulti.c |
| * IBM Ultimotion Video Decoder. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.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; |
| avctx->coded_frame = (AVFrame*) &s->frame; |
| s->ulti_codebook = ulti_codebook; |
| |
| 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, |
| const uint8_t *buf, int buf_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; |
| |
| if(s->frame.data[0]) |
| avctx->release_buffer(avctx, &s->frame); |
| |
| s->frame.reference = 1; |
| s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; |
| if(avctx->get_buffer(avctx, &s->frame) < 0) { |
| av_log(avctx, AV_LOG_ERROR, "get_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; |
| } |
| |
| static av_cold int ulti_decode_end(AVCodecContext *avctx) |
| { |
| /* UltimotionDecodeContext *s = avctx->priv_data;*/ |
| |
| return 0; |
| } |
| |
| AVCodec ulti_decoder = { |
| "ultimotion", |
| CODEC_TYPE_VIDEO, |
| CODEC_ID_ULTI, |
| sizeof(UltimotionDecodeContext), |
| ulti_decode_init, |
| NULL, |
| ulti_decode_end, |
| ulti_decode_frame, |
| CODEC_CAP_DR1, |
| NULL, |
| .long_name = NULL_IF_CONFIG_SMALL("IBM UltiMotion"), |
| }; |
| |
