1/* 2 * Electronic Arts TGQ Video Decoder 3 * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org> 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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 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 GetByteContext gb; 47} TgqContext; 48 49static av_cold int tgq_decode_init(AVCodecContext *avctx){ 50 TgqContext *s = avctx->priv_data; 51 s->avctx = avctx; 52 if(avctx->idct_algo==FF_IDCT_AUTO) 53 avctx->idct_algo=FF_IDCT_EA; 54 dsputil_init(&s->dsp, avctx); 55 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct); 56 avctx->time_base = (AVRational){1, 15}; 57 avctx->pix_fmt = PIX_FMT_YUV420P; 58 return 0; 59} 60 61static void tgq_decode_block(TgqContext *s, DCTELEM block[64], GetBitContext *gb){ 62 uint8_t *perm = s->scantable.permutated; 63 int i,j,value; 64 block[0] = get_sbits(gb,8) * s->qtable[0]; 65 for(i=1; i<64; ) { 66 switch(show_bits(gb,3)) { 67 case 4: 68 block[perm[i++]] = 0; 69 case 0: 70 block[perm[i++]] = 0; 71 skip_bits(gb,3); 72 break; 73 case 5: 74 case 1: 75 skip_bits(gb,2); 76 value = get_bits(gb,6); 77 for(j=0; j<value; j++) 78 block[perm[i++]] = 0; 79 break; 80 case 6: 81 skip_bits(gb,3); 82 block[perm[i]] = -s->qtable[perm[i]]; 83 i++; 84 break; 85 case 2: 86 skip_bits(gb,3); 87 block[perm[i]] = s->qtable[perm[i]]; 88 i++; 89 break; 90 case 7: // 111b 91 case 3: // 011b 92 skip_bits(gb,2); 93 if (show_bits(gb,6)==0x3F) { 94 skip_bits(gb, 6); 95 block[perm[i]] = get_sbits(gb,8)*s->qtable[perm[i]]; 96 }else{ 97 block[perm[i]] = get_sbits(gb,6)*s->qtable[perm[i]]; 98 } 99 i++; 100 break; 101 } 102 } 103 block[0] += 128<<4; 104} 105 106static void tgq_idct_put_mb(TgqContext *s, DCTELEM (*block)[64], int mb_x, int mb_y){ 107 int linesize= s->frame.linesize[0]; 108 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16; 109 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8; 110 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8; 111 112 s->dsp.idct_put(dest_y , linesize, block[0]); 113 s->dsp.idct_put(dest_y + 8, linesize, block[1]); 114 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]); 115 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]); 116 if(!(s->avctx->flags&CODEC_FLAG_GRAY)){ 117 s->dsp.idct_put(dest_cb, s->frame.linesize[1], block[4]); 118 s->dsp.idct_put(dest_cr, s->frame.linesize[2], block[5]); 119 } 120} 121 122static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc){ 123 int level = av_clip_uint8((dc*s->qtable[0] + 2056)>>4); 124 int j; 125 for(j=0;j<8;j++) 126 memset(dst+j*dst_stride, level, 8); 127} 128 129static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc) 130{ 131 int linesize= s->frame.linesize[0]; 132 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16; 133 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8; 134 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8; 135 tgq_dconly(s,dest_y , linesize, dc[0]); 136 tgq_dconly(s,dest_y + 8, linesize, dc[1]); 137 tgq_dconly(s,dest_y + 8*linesize , linesize, dc[2]); 138 tgq_dconly(s,dest_y + 8*linesize + 8, linesize, dc[3]); 139 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) { 140 tgq_dconly(s,dest_cb, s->frame.linesize[1], dc[4]); 141 tgq_dconly(s,dest_cr, s->frame.linesize[2], dc[5]); 142 } 143} 144 145static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x){ 146 int mode; 147 int i; 148 int8_t dc[6]; 149 150 mode = bytestream2_get_byte(&s->gb); 151 if (mode>12) { 152 GetBitContext gb; 153 init_get_bits(&gb, s->gb.buffer, FFMIN(s->gb.buffer_end - s->gb.buffer, mode) * 8); 154 for(i=0; i<6; i++) 155 tgq_decode_block(s, s->block[i], &gb); 156 tgq_idct_put_mb(s, s->block, mb_x, mb_y); 157 bytestream2_skip(&s->gb, mode); 158 }else{ 159 if (mode==3) { 160 memset(dc, bytestream2_get_byte(&s->gb), 4); 161 dc[4] = bytestream2_get_byte(&s->gb); 162 dc[5] = bytestream2_get_byte(&s->gb); 163 }else if (mode==6) { 164 bytestream2_get_buffer(&s->gb, dc, 6); 165 }else if (mode==12) { 166 for (i = 0; i < 6; i++) { 167 dc[i] = bytestream2_get_byte(&s->gb); 168 bytestream2_skip(&s->gb, 1); 169 } 170 }else{ 171 av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode); 172 } 173 tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc); 174 } 175} 176 177static void tgq_calculate_qtable(TgqContext *s, int quant){ 178 int i,j; 179 const int a = (14*(100-quant))/100 + 1; 180 const int b = (11*(100-quant))/100 + 4; 181 for(j=0;j<8;j++) 182 for(i=0;i<8;i++) 183 if (s->avctx->idct_algo==FF_IDCT_EA) 184 s->qtable[j*8+i] = ((a*(j+i)/(7+7) + b)*ff_inv_aanscales[j*8+i])>>(14-4); 185 else 186 s->qtable[j*8+i] = (a*(j+i)/(7+7) + b)<<3; 187} 188 189static int tgq_decode_frame(AVCodecContext *avctx, 190 void *data, int *data_size, 191 AVPacket *avpkt){ 192 const uint8_t *buf = avpkt->data; 193 int buf_size = avpkt->size; 194 TgqContext *s = avctx->priv_data; 195 int x,y; 196 int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF; 197 198 if (buf_size < 16) { 199 av_log(avctx, AV_LOG_WARNING, "truncated header\n"); 200 return -1; 201 } 202 bytestream2_init(&s->gb, buf + 8, buf_size - 8); 203 if (big_endian) { 204 s->width = bytestream2_get_be16u(&s->gb); 205 s->height = bytestream2_get_be16u(&s->gb); 206 } else { 207 s->width = bytestream2_get_le16u(&s->gb); 208 s->height = bytestream2_get_le16u(&s->gb); 209 } 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, bytestream2_get_byteu(&s->gb)); 217 bytestream2_skip(&s->gb, 3); 218 219 if (!s->frame.data[0]) { 220 s->frame.key_frame = 1; 221 s->frame.pict_type = AV_PICTURE_TYPE_I; 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 < FFALIGN(avctx->height, 16) >> 4; y++) 230 for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++) 231 tgq_decode_mb(s, y, x); 232 233 *data_size = sizeof(AVFrame); 234 *(AVFrame*)data = s->frame; 235 236 return avpkt->size; 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 ff_eatgq_decoder = { 247 .name = "eatgq", 248 .type = AVMEDIA_TYPE_VIDEO, 249 .id = CODEC_ID_TGQ, 250 .priv_data_size = sizeof(TgqContext), 251 .init = tgq_decode_init, 252 .close = tgq_decode_end, 253 .decode = tgq_decode_frame, 254 .capabilities = CODEC_CAP_DR1, 255 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"), 256}; 257