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 "avcodec.h" 31#include "blockdsp.h" 32#include "bswapdsp.h" 33#include "idctdsp.h" 34#include "mpegvideo.h" 35#include "mpeg12.h" 36#include "thread.h" 37 38typedef struct MDECContext { 39 AVCodecContext *avctx; 40 BlockDSPContext bdsp; 41 BswapDSPContext bbdsp; 42 IDCTDSPContext idsp; 43 ThreadFrame frame; 44 GetBitContext gb; 45 ScanTable scantable; 46 int version; 47 int qscale; 48 int last_dc[3]; 49 int mb_width; 50 int mb_height; 51 int mb_x, mb_y; 52 DECLARE_ALIGNED(16, int16_t, block)[6][64]; 53 uint8_t *bitstream_buffer; 54 unsigned int bitstream_buffer_size; 55 int block_last_index[6]; 56} MDECContext; 57 58//very similar to MPEG-1 59static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n) 60{ 61 int level, diff, i, j, run; 62 int component; 63 RLTable *rl = &ff_rl_mpeg1; 64 uint8_t * const scantable = a->scantable.permutated; 65 const uint16_t *quant_matrix = ff_mpeg1_default_intra_matrix; 66 const int qscale = a->qscale; 67 68 /* DC coefficient */ 69 if (a->version == 2) { 70 block[0] = 2 * get_sbits(&a->gb, 10) + 1024; 71 } else { 72 component = (n <= 3 ? 0 : n - 4 + 1); 73 diff = decode_dc(&a->gb, component); 74 if (diff >= 0xffff) 75 return AVERROR_INVALIDDATA; 76 a->last_dc[component] += diff; 77 block[0] = a->last_dc[component] << 3; 78 } 79 80 i = 0; 81 { 82 OPEN_READER(re, &a->gb); 83 /* now quantify & encode AC coefficients */ 84 for (;;) { 85 UPDATE_CACHE(re, &a->gb); 86 GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); 87 88 if (level == 127) { 89 break; 90 } else if (level != 0) { 91 i += run; 92 j = scantable[i]; 93 level = (level * qscale * quant_matrix[j]) >> 3; 94 level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1); 95 LAST_SKIP_BITS(re, &a->gb, 1); 96 } else { 97 /* escape */ 98 run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6); 99 UPDATE_CACHE(re, &a->gb); 100 level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10); 101 i += run; 102 j = scantable[i]; 103 if (level < 0) { 104 level = -level; 105 level = (level * qscale * quant_matrix[j]) >> 3; 106 level = (level - 1) | 1; 107 level = -level; 108 } else { 109 level = (level * qscale * quant_matrix[j]) >> 3; 110 level = (level - 1) | 1; 111 } 112 } 113 if (i > 63) { 114 av_log(a->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y); 115 return AVERROR_INVALIDDATA; 116 } 117 118 block[j] = level; 119 } 120 CLOSE_READER(re, &a->gb); 121 } 122 a->block_last_index[n] = i; 123 return 0; 124} 125 126static inline int decode_mb(MDECContext *a, int16_t block[6][64]) 127{ 128 int i, ret; 129 static const int block_index[6] = { 5, 4, 0, 1, 2, 3 }; 130 131 a->bdsp.clear_blocks(block[0]); 132 133 for (i = 0; i < 6; i++) { 134 if ((ret = mdec_decode_block_intra(a, block[block_index[i]], 135 block_index[i])) < 0) 136 return ret; 137 if (get_bits_left(&a->gb) < 0) 138 return AVERROR_INVALIDDATA; 139 } 140 return 0; 141} 142 143static inline void idct_put(MDECContext *a, AVFrame *frame, int mb_x, int mb_y) 144{ 145 int16_t (*block)[64] = a->block; 146 int linesize = frame->linesize[0]; 147 148 uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16; 149 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; 150 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; 151 152 a->idsp.idct_put(dest_y, linesize, block[0]); 153 a->idsp.idct_put(dest_y + 8, linesize, block[1]); 154 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]); 155 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]); 156 157 if (!(a->avctx->flags & CODEC_FLAG_GRAY)) { 158 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]); 159 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]); 160 } 161} 162 163static int decode_frame(AVCodecContext *avctx, 164 void *data, int *got_frame, 165 AVPacket *avpkt) 166{ 167 MDECContext * const a = avctx->priv_data; 168 const uint8_t *buf = avpkt->data; 169 int buf_size = avpkt->size; 170 ThreadFrame frame = { .f = data }; 171 int ret; 172 173 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) 174 return ret; 175 frame.f->pict_type = AV_PICTURE_TYPE_I; 176 frame.f->key_frame = 1; 177 178 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size); 179 if (!a->bitstream_buffer) 180 return AVERROR(ENOMEM); 181 a->bbdsp.bswap16_buf((uint16_t *)a->bitstream_buffer, (uint16_t *)buf, (buf_size + 1) / 2); 182 if ((ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size)) < 0) 183 return ret; 184 185 /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */ 186 skip_bits(&a->gb, 32); 187 188 a->qscale = get_bits(&a->gb, 16); 189 a->version = get_bits(&a->gb, 16); 190 191 a->last_dc[0] = a->last_dc[1] = a->last_dc[2] = 128; 192 193 for (a->mb_x = 0; a->mb_x < a->mb_width; a->mb_x++) { 194 for (a->mb_y = 0; a->mb_y < a->mb_height; a->mb_y++) { 195 if ((ret = decode_mb(a, a->block)) < 0) 196 return ret; 197 198 idct_put(a, frame.f, a->mb_x, a->mb_y); 199 } 200 } 201 202 *got_frame = 1; 203 204 return (get_bits_count(&a->gb) + 31) / 32 * 4; 205} 206 207static av_cold int decode_init(AVCodecContext *avctx) 208{ 209 MDECContext * const a = avctx->priv_data; 210 211 a->mb_width = (avctx->coded_width + 15) / 16; 212 a->mb_height = (avctx->coded_height + 15) / 16; 213 214 a->avctx = avctx; 215 216 ff_blockdsp_init(&a->bdsp, avctx); 217 ff_bswapdsp_init(&a->bbdsp); 218 ff_idctdsp_init(&a->idsp, avctx); 219 ff_mpeg12_init_vlcs(); 220 ff_init_scantable(a->idsp.idct_permutation, &a->scantable, 221 ff_zigzag_direct); 222 223 if (avctx->idct_algo == FF_IDCT_AUTO) 224 avctx->idct_algo = FF_IDCT_SIMPLE; 225 avctx->pix_fmt = AV_PIX_FMT_YUVJ420P; 226 avctx->color_range = AVCOL_RANGE_JPEG; 227 228 return 0; 229} 230 231static av_cold int decode_init_thread_copy(AVCodecContext *avctx) 232{ 233 MDECContext * const a = avctx->priv_data; 234 235 a->avctx = avctx; 236 237 return 0; 238} 239 240static av_cold int decode_end(AVCodecContext *avctx) 241{ 242 MDECContext * const a = avctx->priv_data; 243 244 av_freep(&a->bitstream_buffer); 245 a->bitstream_buffer_size = 0; 246 247 return 0; 248} 249 250AVCodec ff_mdec_decoder = { 251 .name = "mdec", 252 .long_name = NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"), 253 .type = AVMEDIA_TYPE_VIDEO, 254 .id = AV_CODEC_ID_MDEC, 255 .priv_data_size = sizeof(MDECContext), 256 .init = decode_init, 257 .close = decode_end, 258 .decode = decode_frame, 259 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, 260 .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy) 261}; 262