1/* 2 * Sony PlayStation MDEC (Motion DECoder) 3 * Copyright (c) 2003 Michael Niedermayer 4 * 5 * based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl> 6 * 7 * This file is part of Libav. 8 * 9 * Libav is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU Lesser General Public 11 * License as published by the Free Software Foundation; either 12 * version 2.1 of the License, or (at your option) any later version. 13 * 14 * Libav is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with Libav; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 22 */ 23 24/** 25 * @file 26 * Sony PlayStation MDEC (Motion DECoder) 27 * This is very similar to intra-only MPEG-1. 28 */ 29 30#include "avcodec.h" 31#include "dsputil.h" 32#include "mpegvideo.h" 33#include "mpeg12.h" 34#include "thread.h" 35 36typedef struct MDECContext{ 37 AVCodecContext *avctx; 38 DSPContext dsp; 39 AVFrame picture; 40 GetBitContext gb; 41 ScanTable scantable; 42 int version; 43 int qscale; 44 int last_dc[3]; 45 int mb_width; 46 int mb_height; 47 int mb_x, mb_y; 48 DECLARE_ALIGNED(16, DCTELEM, block)[6][64]; 49 uint8_t *bitstream_buffer; 50 unsigned int bitstream_buffer_size; 51 int block_last_index[6]; 52} MDECContext; 53 54//very similar to MPEG-1 55static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n) 56{ 57 int level, diff, i, j, run; 58 int component; 59 RLTable *rl = &ff_rl_mpeg1; 60 uint8_t * const scantable= a->scantable.permutated; 61 const uint16_t *quant_matrix= ff_mpeg1_default_intra_matrix; 62 const int qscale= a->qscale; 63 64 /* DC coefficient */ 65 if(a->version==2){ 66 block[0]= 2*get_sbits(&a->gb, 10) + 1024; 67 }else{ 68 component = (n <= 3 ? 0 : n - 4 + 1); 69 diff = decode_dc(&a->gb, component); 70 if (diff >= 0xffff) 71 return -1; 72 a->last_dc[component]+= diff; 73 block[0] = a->last_dc[component]<<3; 74 } 75 76 i = 0; 77 { 78 OPEN_READER(re, &a->gb); 79 /* now quantify & encode AC coefficients */ 80 for(;;) { 81 UPDATE_CACHE(re, &a->gb); 82 GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); 83 84 if(level == 127){ 85 break; 86 } else if(level != 0) { 87 i += run; 88 j = scantable[i]; 89 level= (level*qscale*quant_matrix[j])>>3; 90 level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1); 91 LAST_SKIP_BITS(re, &a->gb, 1); 92 } else { 93 /* escape */ 94 run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6); 95 UPDATE_CACHE(re, &a->gb); 96 level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10); 97 i += run; 98 j = scantable[i]; 99 if(level<0){ 100 level= -level; 101 level= (level*qscale*quant_matrix[j])>>3; 102 level= (level-1)|1; 103 level= -level; 104 }else{ 105 level= (level*qscale*quant_matrix[j])>>3; 106 level= (level-1)|1; 107 } 108 } 109 if (i > 63){ 110 av_log(a->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y); 111 return -1; 112 } 113 114 block[j] = level; 115 } 116 CLOSE_READER(re, &a->gb); 117 } 118 a->block_last_index[n] = i; 119 return 0; 120} 121 122static inline int decode_mb(MDECContext *a, DCTELEM block[6][64]){ 123 int i; 124 const int block_index[6]= {5,4,0,1,2,3}; 125 126 a->dsp.clear_blocks(block[0]); 127 128 for(i=0; i<6; i++){ 129 if( mdec_decode_block_intra(a, block[ block_index[i] ], block_index[i]) < 0 || 130 get_bits_left(&a->gb) < 0) 131 return -1; 132 } 133 return 0; 134} 135 136static inline void idct_put(MDECContext *a, int mb_x, int mb_y){ 137 DCTELEM (*block)[64]= a->block; 138 int linesize= a->picture.linesize[0]; 139 140 uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16; 141 uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8; 142 uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8; 143 144 a->dsp.idct_put(dest_y , linesize, block[0]); 145 a->dsp.idct_put(dest_y + 8, linesize, block[1]); 146 a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]); 147 a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]); 148 149 if(!(a->avctx->flags&CODEC_FLAG_GRAY)){ 150 a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]); 151 a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]); 152 } 153} 154 155static int decode_frame(AVCodecContext *avctx, 156 void *data, int *data_size, 157 AVPacket *avpkt) 158{ 159 const uint8_t *buf = avpkt->data; 160 int buf_size = avpkt->size; 161 MDECContext * const a = avctx->priv_data; 162 AVFrame *picture = data; 163 AVFrame * const p= &a->picture; 164 int i; 165 166 if(p->data[0]) 167 ff_thread_release_buffer(avctx, p); 168 169 p->reference= 0; 170 if(ff_thread_get_buffer(avctx, p) < 0){ 171 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 172 return -1; 173 } 174 p->pict_type= AV_PICTURE_TYPE_I; 175 p->key_frame= 1; 176 177 av_fast_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); 178 if (!a->bitstream_buffer) 179 return AVERROR(ENOMEM); 180 for(i=0; i<buf_size; i+=2){ 181 a->bitstream_buffer[i] = buf[i+1]; 182 a->bitstream_buffer[i+1]= buf[i ]; 183 } 184 init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8); 185 186 /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */ 187 skip_bits(&a->gb, 32); 188 189 a->qscale= get_bits(&a->gb, 16); 190 a->version= get_bits(&a->gb, 16); 191 192 a->last_dc[0]= 193 a->last_dc[1]= 194 a->last_dc[2]= 128; 195 196 for(a->mb_x=0; a->mb_x<a->mb_width; a->mb_x++){ 197 for(a->mb_y=0; a->mb_y<a->mb_height; a->mb_y++){ 198 if( decode_mb(a, a->block) <0) 199 return -1; 200 201 idct_put(a, a->mb_x, a->mb_y); 202 } 203 } 204 205 p->quality= a->qscale * FF_QP2LAMBDA; 206 memset(p->qscale_table, a->qscale, a->mb_width); 207 208 *picture = a->picture; 209 *data_size = sizeof(AVPicture); 210 211 return (get_bits_count(&a->gb)+31)/32*4; 212} 213 214static av_cold void mdec_common_init(AVCodecContext *avctx){ 215 MDECContext * const a = avctx->priv_data; 216 217 dsputil_init(&a->dsp, avctx); 218 219 a->mb_width = (avctx->coded_width + 15) / 16; 220 a->mb_height = (avctx->coded_height + 15) / 16; 221 222 avctx->coded_frame= &a->picture; 223 a->avctx= avctx; 224} 225 226static av_cold int decode_init(AVCodecContext *avctx){ 227 MDECContext * const a = avctx->priv_data; 228 AVFrame *p= &a->picture; 229 230 mdec_common_init(avctx); 231 ff_mpeg12_init_vlcs(); 232 ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_zigzag_direct); 233 234 if( avctx->idct_algo == FF_IDCT_AUTO ) 235 avctx->idct_algo = FF_IDCT_SIMPLE; 236 p->qstride= 0; 237 p->qscale_table= av_mallocz(a->mb_width); 238 avctx->pix_fmt= PIX_FMT_YUVJ420P; 239 240 return 0; 241} 242 243static av_cold int decode_init_thread_copy(AVCodecContext *avctx){ 244 MDECContext * const a = avctx->priv_data; 245 AVFrame *p = (AVFrame*)&a->picture; 246 247 avctx->coded_frame = p; 248 a->avctx= avctx; 249 250 p->qscale_table = av_mallocz( a->mb_width); 251 252 return 0; 253} 254 255static av_cold int decode_end(AVCodecContext *avctx){ 256 MDECContext * const a = avctx->priv_data; 257 258 if(a->picture.data[0]) 259 avctx->release_buffer(avctx, &a->picture); 260 av_freep(&a->bitstream_buffer); 261 av_freep(&a->picture.qscale_table); 262 a->bitstream_buffer_size=0; 263 264 return 0; 265} 266 267AVCodec ff_mdec_decoder = { 268 .name = "mdec", 269 .type = AVMEDIA_TYPE_VIDEO, 270 .id = CODEC_ID_MDEC, 271 .priv_data_size = sizeof(MDECContext), 272 .init = decode_init, 273 .close = decode_end, 274 .decode = decode_frame, 275 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, 276 .long_name= NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"), 277 .init_thread_copy= ONLY_IF_THREADS_ENABLED(decode_init_thread_copy) 278}; 279 280