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 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 "get_bits.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 DECLARE_ALIGNED(16, DCTELEM, block)[6][64]; 46} TgqContext; 47 48static av_cold int tgq_decode_init(AVCodecContext *avctx){ 49 TgqContext *s = avctx->priv_data; 50 s->avctx = avctx; 51 if(avctx->idct_algo==FF_IDCT_AUTO) 52 avctx->idct_algo=FF_IDCT_EA; 53 dsputil_init(&s->dsp, avctx); 54 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct); 55 avctx->time_base = (AVRational){1, 15}; 56 avctx->pix_fmt = PIX_FMT_YUV420P; 57 return 0; 58} 59 60static void tgq_decode_block(TgqContext *s, DCTELEM block[64], GetBitContext *gb){ 61 uint8_t *perm = s->scantable.permutated; 62 int i,j,value; 63 block[0] = get_sbits(gb,8) * s->qtable[0]; 64 for(i=1; i<64; ) { 65 switch(show_bits(gb,3)) { 66 case 4: 67 block[perm[i++]] = 0; 68 case 0: 69 block[perm[i++]] = 0; 70 skip_bits(gb,3); 71 break; 72 case 5: 73 case 1: 74 skip_bits(gb,2); 75 value = get_bits(gb,6); 76 for(j=0; j<value; j++) 77 block[perm[i++]] = 0; 78 break; 79 case 6: 80 skip_bits(gb,3); 81 block[perm[i]] = -s->qtable[perm[i]]; 82 i++; 83 break; 84 case 2: 85 skip_bits(gb,3); 86 block[perm[i]] = s->qtable[perm[i]]; 87 i++; 88 break; 89 case 7: // 111b 90 case 3: // 011b 91 skip_bits(gb,2); 92 if (show_bits(gb,6)==0x3F) { 93 skip_bits(gb, 6); 94 block[perm[i]] = get_sbits(gb,8)*s->qtable[perm[i]]; 95 }else{ 96 block[perm[i]] = get_sbits(gb,6)*s->qtable[perm[i]]; 97 } 98 i++; 99 break; 100 } 101 } 102 block[0] += 128<<4; 103} 104 105static void tgq_idct_put_mb(TgqContext *s, DCTELEM (*block)[64], int mb_x, int mb_y){ 106 int linesize= s->frame.linesize[0]; 107 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16; 108 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8; 109 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8; 110 111 s->dsp.idct_put(dest_y , linesize, block[0]); 112 s->dsp.idct_put(dest_y + 8, linesize, block[1]); 113 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]); 114 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]); 115 if(!(s->avctx->flags&CODEC_FLAG_GRAY)){ 116 s->dsp.idct_put(dest_cb, s->frame.linesize[1], block[4]); 117 s->dsp.idct_put(dest_cr, s->frame.linesize[2], block[5]); 118 } 119} 120 121static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc){ 122 int level = av_clip_uint8((dc*s->qtable[0] + 2056)>>4); 123 int j; 124 for(j=0;j<8;j++) 125 memset(dst+j*dst_stride, level, 8); 126} 127 128static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc) 129{ 130 int linesize= s->frame.linesize[0]; 131 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16; 132 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8; 133 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8; 134 tgq_dconly(s,dest_y , linesize, dc[0]); 135 tgq_dconly(s,dest_y + 8, linesize, dc[1]); 136 tgq_dconly(s,dest_y + 8*linesize , linesize, dc[2]); 137 tgq_dconly(s,dest_y + 8*linesize + 8, linesize, dc[3]); 138 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) { 139 tgq_dconly(s,dest_cb, s->frame.linesize[1], dc[4]); 140 tgq_dconly(s,dest_cr, s->frame.linesize[2], dc[5]); 141 } 142} 143 144static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x, const uint8_t **bs, const uint8_t *buf_end){ 145 int mode; 146 int i; 147 int8_t dc[6]; 148 149 mode = bytestream_get_byte(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, s->block[i], &gb); 160 tgq_idct_put_mb(s, 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 AVPacket *avpkt){ 194 const uint8_t *buf = avpkt->data; 195 int buf_size = avpkt->size; 196 const uint8_t *buf_start = buf; 197 const uint8_t *buf_end = buf + buf_size; 198 TgqContext *s = avctx->priv_data; 199 int x,y; 200 201 int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF; 202 buf += 8; 203 204 if(8>buf_end-buf) { 205 av_log(avctx, AV_LOG_WARNING, "truncated header\n"); 206 return -1; 207 } 208 s->width = big_endian ? AV_RB16(&buf[0]) : AV_RL16(&buf[0]); 209 s->height = big_endian ? AV_RB16(&buf[2]) : AV_RL16(&buf[2]); 210 211 if (s->avctx->width!=s->width || s->avctx->height!=s->height) { 212 avcodec_set_dimensions(s->avctx, s->width, s->height); 213 if (s->frame.data[0]) 214 avctx->release_buffer(avctx, &s->frame); 215 } 216 tgq_calculate_qtable(s, buf[4]); 217 buf += 8; 218 219 if (!s->frame.data[0]) { 220 s->frame.key_frame = 1; 221 s->frame.pict_type = FF_I_TYPE; 222 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID; 223 if (avctx->get_buffer(avctx, &s->frame)) { 224 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 225 return -1; 226 } 227 } 228 229 for (y=0; y<(avctx->height+15)/16; y++) 230 for (x=0; x<(avctx->width+15)/16; x++) 231 tgq_decode_mb(s, y, x, &buf, buf_end); 232 233 *data_size = sizeof(AVFrame); 234 *(AVFrame*)data = s->frame; 235 236 return buf-buf_start; 237} 238 239static av_cold int tgq_decode_end(AVCodecContext *avctx){ 240 TgqContext *s = avctx->priv_data; 241 if (s->frame.data[0]) 242 s->avctx->release_buffer(avctx, &s->frame); 243 return 0; 244} 245 246AVCodec eatgq_decoder = { 247 "eatgq", 248 AVMEDIA_TYPE_VIDEO, 249 CODEC_ID_TGQ, 250 sizeof(TgqContext), 251 tgq_decode_init, 252 NULL, 253 tgq_decode_end, 254 tgq_decode_frame, 255 CODEC_CAP_DR1, 256 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"), 257}; 258