1/* 2 * Electronic Arts TGQ Video Decoder 3 * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file libavcodec/eatgq.c 24 * Electronic Arts TGQ Video Decoder 25 * @author Peter Ross <pross@xvid.org> 26 * 27 * Technical details here: 28 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ 29 */ 30 31#include "avcodec.h" 32#define ALT_BITSTREAM_READER_LE 33#include "bitstream.h" 34#include "bytestream.h" 35#include "dsputil.h" 36#include "aandcttab.h" 37 38typedef struct TgqContext { 39 AVCodecContext *avctx; 40 DSPContext dsp; 41 AVFrame frame; 42 int width,height; 43 ScanTable scantable; 44 int qtable[64]; 45} TgqContext; 46 47static av_cold int tgq_decode_init(AVCodecContext *avctx){ 48 TgqContext *s = avctx->priv_data; 49 s->avctx = avctx; 50 if(avctx->idct_algo==FF_IDCT_AUTO) 51 avctx->idct_algo=FF_IDCT_EA; 52 dsputil_init(&s->dsp, avctx); 53 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct); 54 avctx->time_base = (AVRational){1, 15}; 55 avctx->pix_fmt = PIX_FMT_YUV420P; 56 return 0; 57} 58 59static void tgq_decode_block(TgqContext *s, DCTELEM block[64], GetBitContext *gb){ 60 uint8_t *perm = s->scantable.permutated; 61 int i,j,value; 62 block[0] = get_sbits(gb,8) * s->qtable[0]; 63 for(i=1; i<64; ) { 64 switch(show_bits(gb,3)) { 65 case 4: 66 block[perm[i++]] = 0; 67 case 0: 68 block[perm[i++]] = 0; 69 skip_bits(gb,3); 70 break; 71 case 5: 72 case 1: 73 skip_bits(gb,2); 74 value = get_bits(gb,6); 75 for(j=0; j<value; j++) 76 block[perm[i++]] = 0; 77 break; 78 case 6: 79 skip_bits(gb,3); 80 block[perm[i]] = -s->qtable[perm[i]]; 81 i++; 82 break; 83 case 2: 84 skip_bits(gb,3); 85 block[perm[i]] = s->qtable[perm[i]]; 86 i++; 87 break; 88 case 7: // 111b 89 case 3: // 011b 90 skip_bits(gb,2); 91 if (show_bits(gb,6)==0x3F) { 92 skip_bits(gb, 6); 93 block[perm[i]] = get_sbits(gb,8)*s->qtable[perm[i]]; 94 }else{ 95 block[perm[i]] = get_sbits(gb,6)*s->qtable[perm[i]]; 96 } 97 i++; 98 break; 99 } 100 } 101 block[0] += 128<<4; 102} 103 104static void tgq_idct_put_mb(TgqContext *s, DCTELEM (*block)[64], int mb_x, int mb_y){ 105 int linesize= s->frame.linesize[0]; 106 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16; 107 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8; 108 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8; 109 110 s->dsp.idct_put(dest_y , linesize, block[0]); 111 s->dsp.idct_put(dest_y + 8, linesize, block[1]); 112 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]); 113 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]); 114 if(!(s->avctx->flags&CODEC_FLAG_GRAY)){ 115 s->dsp.idct_put(dest_cb, s->frame.linesize[1], block[4]); 116 s->dsp.idct_put(dest_cr, s->frame.linesize[2], block[5]); 117 } 118} 119 120static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc){ 121 int level = av_clip_uint8((dc*s->qtable[0] + 2056)>>4); 122 int j; 123 for(j=0;j<8;j++) 124 memset(dst+j*dst_stride, level, 8); 125} 126 127static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc) 128{ 129 int linesize= s->frame.linesize[0]; 130 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16; 131 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8; 132 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8; 133 tgq_dconly(s,dest_y , linesize, dc[0]); 134 tgq_dconly(s,dest_y + 8, linesize, dc[1]); 135 tgq_dconly(s,dest_y + 8*linesize , linesize, dc[2]); 136 tgq_dconly(s,dest_y + 8*linesize + 8, linesize, dc[3]); 137 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) { 138 tgq_dconly(s,dest_cb, s->frame.linesize[1], dc[4]); 139 tgq_dconly(s,dest_cr, s->frame.linesize[2], dc[5]); 140 } 141} 142 143static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x, const int8_t **bs, const int8_t *buf_end){ 144 int mode; 145 int i; 146 int8_t dc[6]; 147 DCTELEM block[6][64]; 148 149 mode = bytestream_get_byte((const uint8_t**)bs); 150 if (mode>buf_end-*bs) { 151 av_log(s->avctx, AV_LOG_ERROR, "truncated macroblock\n"); 152 return; 153 } 154 155 if (mode>12) { 156 GetBitContext gb; 157 init_get_bits(&gb, *bs, mode*8); 158 for(i=0; i<6; i++) 159 tgq_decode_block(s, block[i], &gb); 160 tgq_idct_put_mb(s, block, mb_x, mb_y); 161 }else{ 162 if (mode==3) { 163 memset(dc, (*bs)[0], 4); 164 dc[4] = (*bs)[1]; 165 dc[5] = (*bs)[2]; 166 }else if (mode==6) { 167 memcpy(dc, *bs, 6); 168 }else if (mode==12) { 169 for(i=0; i<6; i++) 170 dc[i] = (*bs)[i*2]; 171 }else{ 172 av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode); 173 } 174 tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc); 175 } 176 *bs += mode; 177} 178 179static void tgq_calculate_qtable(TgqContext *s, int quant){ 180 int i,j; 181 const int a = (14*(100-quant))/100 + 1; 182 const int b = (11*(100-quant))/100 + 4; 183 for(j=0;j<8;j++) 184 for(i=0;i<8;i++) 185 if (s->avctx->idct_algo==FF_IDCT_EA) 186 s->qtable[j*8+i] = ((a*(j+i)/(7+7) + b)*ff_inv_aanscales[j*8+i])>>(14-4); 187 else 188 s->qtable[j*8+i] = (a*(j+i)/(7+7) + b)<<3; 189} 190 191static int tgq_decode_frame(AVCodecContext *avctx, 192 void *data, int *data_size, 193 const uint8_t *buf, int buf_size){ 194 const uint8_t *buf_start = buf; 195 const uint8_t *buf_end = buf + buf_size; 196 TgqContext *s = avctx->priv_data; 197 int x,y; 198 199 int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF; 200 buf += 8; 201 202 if(8>buf_end-buf) { 203 av_log(avctx, AV_LOG_WARNING, "truncated header\n"); 204 return -1; 205 } 206 s->width = big_endian ? AV_RB16(&buf[0]) : AV_RL16(&buf[0]); 207 s->height = big_endian ? AV_RB16(&buf[2]) : AV_RL16(&buf[2]); 208 209 if (s->avctx->width!=s->width || s->avctx->height!=s->height) { 210 avcodec_set_dimensions(s->avctx, s->width, s->height); 211 if (s->frame.data[0]) 212 avctx->release_buffer(avctx, &s->frame); 213 } 214 tgq_calculate_qtable(s, buf[4]); 215 buf += 8; 216 217 if (!s->frame.data[0]) { 218 s->frame.key_frame = 1; 219 s->frame.pict_type = FF_I_TYPE; 220 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID; 221 if (avctx->get_buffer(avctx, &s->frame)) { 222 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 223 return -1; 224 } 225 } 226 227 for (y=0; y<(avctx->height+15)/16; y++) 228 for (x=0; x<(avctx->width+15)/16; x++) 229 tgq_decode_mb(s, y, x, (const int8_t**)&buf, (const int8_t*)buf_end); 230 231 *data_size = sizeof(AVFrame); 232 *(AVFrame*)data = s->frame; 233 234 return buf-buf_start; 235} 236 237static av_cold int tgq_decode_end(AVCodecContext *avctx){ 238 TgqContext *s = avctx->priv_data; 239 if (s->frame.data[0]) 240 s->avctx->release_buffer(avctx, &s->frame); 241 return 0; 242} 243 244AVCodec eatgq_decoder = { 245 "eatgq", 246 CODEC_TYPE_VIDEO, 247 CODEC_ID_TGQ, 248 sizeof(TgqContext), 249 tgq_decode_init, 250 NULL, 251 tgq_decode_end, 252 tgq_decode_frame, 253 CODEC_CAP_DR1, 254 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"), 255}; 256