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 FFmpeg. 8 * 9 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "libavutil/mem_internal.h" 31 32#include "avcodec.h" 33#include "blockdsp.h" 34#include "bswapdsp.h" 35#include "codec_internal.h" 36#include "idctdsp.h" 37#include "mpeg12data.h" 38#include "mpeg12dec.h" 39#include "thread.h" 40 41typedef struct MDECContext { 42 AVCodecContext *avctx; 43 BlockDSPContext bdsp; 44 BswapDSPContext bbdsp; 45 IDCTDSPContext idsp; 46 GetBitContext gb; 47 ScanTable scantable; 48 int version; 49 int qscale; 50 int last_dc[3]; 51 int mb_width; 52 int mb_height; 53 int mb_x, mb_y; 54 DECLARE_ALIGNED(32, int16_t, block)[6][64]; 55 DECLARE_ALIGNED(16, uint16_t, quant_matrix)[64]; 56 uint8_t *bitstream_buffer; 57 unsigned int bitstream_buffer_size; 58 int block_last_index[6]; 59} MDECContext; 60 61//very similar to MPEG-1 62static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n) 63{ 64 int level, diff, i, j, run; 65 int component; 66 RLTable *rl = &ff_rl_mpeg1; 67 uint8_t * const scantable = a->scantable.permutated; 68 const uint16_t *quant_matrix = a->quant_matrix; 69 const int qscale = a->qscale; 70 71 /* DC coefficient */ 72 if (a->version == 2) { 73 block[0] = 2 * get_sbits(&a->gb, 10) + 1024; 74 } else { 75 component = (n <= 3 ? 0 : n - 4 + 1); 76 diff = decode_dc(&a->gb, component); 77 a->last_dc[component] += diff; 78 block[0] = a->last_dc[component] * (1 << 3); 79 } 80 81 i = 0; 82 { 83 OPEN_READER(re, &a->gb); 84 /* now quantify & encode AC coefficients */ 85 for (;;) { 86 UPDATE_CACHE(re, &a->gb); 87 GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); 88 89 if (level == 127) { 90 break; 91 } else if (level != 0) { 92 i += run; 93 if (i > 63) { 94 av_log(a->avctx, AV_LOG_ERROR, 95 "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y); 96 return AVERROR_INVALIDDATA; 97 } 98 j = scantable[i]; 99 level = (level * qscale * quant_matrix[j]) >> 3; 100 level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1); 101 LAST_SKIP_BITS(re, &a->gb, 1); 102 } else { 103 /* escape */ 104 run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6); 105 UPDATE_CACHE(re, &a->gb); 106 level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10); 107 i += run; 108 if (i > 63) { 109 av_log(a->avctx, AV_LOG_ERROR, 110 "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y); 111 return AVERROR_INVALIDDATA; 112 } 113 j = scantable[i]; 114 if (level < 0) { 115 level = -level; 116 level = (level * (unsigned)qscale * quant_matrix[j]) >> 3; 117 level = (level - 1) | 1; 118 level = -level; 119 } else { 120 level = (level * (unsigned)qscale * quant_matrix[j]) >> 3; 121 level = (level - 1) | 1; 122 } 123 } 124 125 block[j] = level; 126 } 127 CLOSE_READER(re, &a->gb); 128 } 129 a->block_last_index[n] = i; 130 return 0; 131} 132 133static inline int decode_mb(MDECContext *a, int16_t block[6][64]) 134{ 135 int i, ret; 136 static const int block_index[6] = { 5, 4, 0, 1, 2, 3 }; 137 138 a->bdsp.clear_blocks(block[0]); 139 140 for (i = 0; i < 6; i++) { 141 if ((ret = mdec_decode_block_intra(a, block[block_index[i]], 142 block_index[i])) < 0) 143 return ret; 144 if (get_bits_left(&a->gb) < 0) 145 return AVERROR_INVALIDDATA; 146 } 147 return 0; 148} 149 150static inline void idct_put(MDECContext *a, AVFrame *frame, int mb_x, int mb_y) 151{ 152 int16_t (*block)[64] = a->block; 153 int linesize = frame->linesize[0]; 154 155 uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16; 156 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; 157 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; 158 159 a->idsp.idct_put(dest_y, linesize, block[0]); 160 a->idsp.idct_put(dest_y + 8, linesize, block[1]); 161 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]); 162 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]); 163 164 if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) { 165 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]); 166 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]); 167 } 168} 169 170static int decode_frame(AVCodecContext *avctx, AVFrame *frame, 171 int *got_frame, AVPacket *avpkt) 172{ 173 MDECContext * const a = avctx->priv_data; 174 const uint8_t *buf = avpkt->data; 175 int buf_size = avpkt->size; 176 int ret; 177 178 if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0) 179 return ret; 180 frame->pict_type = AV_PICTURE_TYPE_I; 181 frame->key_frame = 1; 182 183 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size); 184 if (!a->bitstream_buffer) 185 return AVERROR(ENOMEM); 186 a->bbdsp.bswap16_buf((uint16_t *)a->bitstream_buffer, (uint16_t *)buf, (buf_size + 1) / 2); 187 if ((ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size)) < 0) 188 return ret; 189 190 /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */ 191 skip_bits(&a->gb, 32); 192 193 a->qscale = get_bits(&a->gb, 16); 194 a->version = get_bits(&a->gb, 16); 195 196 a->last_dc[0] = a->last_dc[1] = a->last_dc[2] = 128; 197 198 for (a->mb_x = 0; a->mb_x < a->mb_width; a->mb_x++) { 199 for (a->mb_y = 0; a->mb_y < a->mb_height; a->mb_y++) { 200 if ((ret = decode_mb(a, a->block)) < 0) 201 return ret; 202 203 idct_put(a, frame, a->mb_x, a->mb_y); 204 } 205 } 206 207 *got_frame = 1; 208 209 return (get_bits_count(&a->gb) + 31) / 32 * 4; 210} 211 212static av_cold int decode_init(AVCodecContext *avctx) 213{ 214 MDECContext * const a = avctx->priv_data; 215 int i; 216 217 a->mb_width = (avctx->coded_width + 15) / 16; 218 a->mb_height = (avctx->coded_height + 15) / 16; 219 220 a->avctx = avctx; 221 222 ff_blockdsp_init(&a->bdsp, avctx); 223 ff_bswapdsp_init(&a->bbdsp); 224 ff_idctdsp_init(&a->idsp, avctx); 225 ff_mpeg12_init_vlcs(); 226 ff_init_scantable(a->idsp.idct_permutation, &a->scantable, 227 ff_zigzag_direct); 228 229 avctx->pix_fmt = AV_PIX_FMT_YUVJ420P; 230 avctx->color_range = AVCOL_RANGE_JPEG; 231 232 /* init q matrix */ 233 for (i = 0; i < 64; i++) { 234 int j = a->idsp.idct_permutation[i]; 235 236 a->quant_matrix[j] = ff_mpeg1_default_intra_matrix[i]; 237 } 238 239 return 0; 240} 241 242static av_cold int decode_end(AVCodecContext *avctx) 243{ 244 MDECContext * const a = avctx->priv_data; 245 246 av_freep(&a->bitstream_buffer); 247 a->bitstream_buffer_size = 0; 248 249 return 0; 250} 251 252const FFCodec ff_mdec_decoder = { 253 .p.name = "mdec", 254 .p.long_name = NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"), 255 .p.type = AVMEDIA_TYPE_VIDEO, 256 .p.id = AV_CODEC_ID_MDEC, 257 .priv_data_size = sizeof(MDECContext), 258 .init = decode_init, 259 .close = decode_end, 260 FF_CODEC_DECODE_CB(decode_frame), 261 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS, 262 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 263}; 264