| Line | Branch | Exec | Source |
|---|---|---|---|
| 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.h" | ||
| 31 | #include "libavutil/mem_internal.h" | ||
| 32 | |||
| 33 | #include "avcodec.h" | ||
| 34 | #include "blockdsp.h" | ||
| 35 | #include "bswapdsp.h" | ||
| 36 | #include "codec_internal.h" | ||
| 37 | #include "idctdsp.h" | ||
| 38 | #include "mpeg12data.h" | ||
| 39 | #include "mpeg12dec.h" | ||
| 40 | #include "thread.h" | ||
| 41 | |||
| 42 | typedef struct MDECContext { | ||
| 43 | AVCodecContext *avctx; | ||
| 44 | BlockDSPContext bdsp; | ||
| 45 | BswapDSPContext bbdsp; | ||
| 46 | IDCTDSPContext idsp; | ||
| 47 | GetBitContext gb; | ||
| 48 | uint8_t permutated_scantable[64]; | ||
| 49 | int version; | ||
| 50 | int qscale; | ||
| 51 | int last_dc[3]; | ||
| 52 | int mb_width; | ||
| 53 | int mb_height; | ||
| 54 | int mb_x, mb_y; | ||
| 55 | DECLARE_ALIGNED(32, int16_t, block)[6][64]; | ||
| 56 | DECLARE_ALIGNED(16, uint16_t, quant_matrix)[64]; | ||
| 57 | uint8_t *bitstream_buffer; | ||
| 58 | unsigned int bitstream_buffer_size; | ||
| 59 | } MDECContext; | ||
| 60 | |||
| 61 | //very similar to MPEG-1 | ||
| 62 | 285689 | static 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 | 285689 | const uint8_t *const scantable = a->permutated_scantable; | |
| 67 | 285689 | const uint16_t *quant_matrix = a->quant_matrix; | |
| 68 | 285689 | const int qscale = a->qscale; | |
| 69 | |||
| 70 | /* DC coefficient */ | ||
| 71 |
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285689 | if (a->version <= 2) { |
| 72 | 214889 | block[0] = 2 * get_sbits(&a->gb, 10) + 1024; | |
| 73 | } else { | ||
| 74 | 70800 | component = (n <= 3 ? 0 : n - 4 + 1); | |
| 75 | 70800 | diff = decode_dc(&a->gb, component); | |
| 76 | 70800 | a->last_dc[component] += diff; | |
| 77 | 70800 | block[0] = a->last_dc[component] * (1 << 3); | |
| 78 | } | ||
| 79 | |||
| 80 | 285689 | i = 0; | |
| 81 | { | ||
| 82 | 285689 | OPEN_READER(re, &a->gb); | |
| 83 | /* now quantify & encode AC coefficients */ | ||
| 84 | for (;;) { | ||
| 85 | 4638889 | UPDATE_CACHE(re, &a->gb); | |
| 86 |
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2462289 | GET_RL_VLC(level, run, re, &a->gb, ff_mpeg1_rl_vlc, TEX_VLC_BITS, 2, 0); |
| 87 | |||
| 88 |
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2462289 | if (level == 127) { |
| 89 | 285688 | break; | |
| 90 |
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2176601 | } else if (level != 0) { |
| 91 | 2133703 | i += run; | |
| 92 |
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2133703 | if (i > 63) { |
| 93 | 1 | av_log(a->avctx, AV_LOG_ERROR, | |
| 94 | "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y); | ||
| 95 | 1 | return AVERROR_INVALIDDATA; | |
| 96 | } | ||
| 97 | 2133702 | j = scantable[i]; | |
| 98 | 2133702 | level = (level * qscale * quant_matrix[j]) >> 3; | |
| 99 | 2133702 | level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1); | |
| 100 | 2133702 | LAST_SKIP_BITS(re, &a->gb, 1); | |
| 101 | } else { | ||
| 102 | /* escape */ | ||
| 103 | 42898 | run = SHOW_UBITS(re, &a->gb, 6) + 1; | |
| 104 | 42898 | SKIP_BITS(re, &a->gb, 6); | |
| 105 | 42898 | level = SHOW_SBITS(re, &a->gb, 10); | |
| 106 | 42898 | LAST_SKIP_BITS(re, &a->gb, 10); | |
| 107 | 42898 | i += run; | |
| 108 |
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42898 | 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 | 42898 | j = scantable[i]; | |
| 114 |
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42898 | if (level < 0) { |
| 115 | 24818 | level = -level; | |
| 116 | 24818 | level = (level * (unsigned)qscale * quant_matrix[j]) >> 3; | |
| 117 | 24818 | level = (level - 1) | 1; | |
| 118 | 24818 | level = -level; | |
| 119 | } else { | ||
| 120 | 18080 | level = (level * (unsigned)qscale * quant_matrix[j]) >> 3; | |
| 121 | 18080 | level = (level - 1) | 1; | |
| 122 | } | ||
| 123 | } | ||
| 124 | |||
| 125 | 2176600 | block[j] = level; | |
| 126 | } | ||
| 127 | 285688 | CLOSE_READER(re, &a->gb); | |
| 128 | } | ||
| 129 | 285688 | return 0; | |
| 130 | } | ||
| 131 | |||
| 132 | 47615 | static inline int decode_mb(MDECContext *a, int16_t block[6][64]) | |
| 133 | { | ||
| 134 | int i, ret; | ||
| 135 | static const int block_index[6] = { 5, 4, 0, 1, 2, 3 }; | ||
| 136 | |||
| 137 | 47615 | a->bdsp.clear_blocks(block[0]); | |
| 138 | |||
| 139 |
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333303 | for (i = 0; i < 6; i++) { |
| 140 |
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285689 | if ((ret = mdec_decode_block_intra(a, block[block_index[i]], |
| 141 | 285689 | block_index[i])) < 0) | |
| 142 | 1 | return ret; | |
| 143 |
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285688 | if (get_bits_left(&a->gb) < 0) |
| 144 | ✗ | return AVERROR_INVALIDDATA; | |
| 145 | } | ||
| 146 | 47614 | return 0; | |
| 147 | } | ||
| 148 | |||
| 149 | 47614 | static inline void idct_put(MDECContext *a, AVFrame *frame, int mb_x, int mb_y) | |
| 150 | { | ||
| 151 | 47614 | int16_t (*block)[64] = a->block; | |
| 152 | 47614 | int linesize = frame->linesize[0]; | |
| 153 | |||
| 154 | 47614 | uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16; | |
| 155 | 47614 | uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; | |
| 156 | 47614 | uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; | |
| 157 | |||
| 158 | 47614 | a->idsp.idct_put(dest_y, linesize, block[0]); | |
| 159 | 47614 | a->idsp.idct_put(dest_y + 8, linesize, block[1]); | |
| 160 | 47614 | a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]); | |
| 161 | 47614 | a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]); | |
| 162 | |||
| 163 |
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47614 | if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
| 164 | 47614 | a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]); | |
| 165 | 47614 | a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]); | |
| 166 | } | ||
| 167 | 47614 | } | |
| 168 | |||
| 169 | 194 | static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 170 | int *got_frame, AVPacket *avpkt) | ||
| 171 | { | ||
| 172 | 194 | MDECContext * const a = avctx->priv_data; | |
| 173 | 194 | const uint8_t *buf = avpkt->data; | |
| 174 | 194 | int buf_size = avpkt->size; | |
| 175 | int ret; | ||
| 176 | |||
| 177 |
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194 | if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0) |
| 178 | ✗ | return ret; | |
| 179 | |||
| 180 | 194 | av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size); | |
| 181 |
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194 | if (!a->bitstream_buffer) |
| 182 | ✗ | return AVERROR(ENOMEM); | |
| 183 | 194 | a->bbdsp.bswap16_buf((uint16_t *)a->bitstream_buffer, (uint16_t *)buf, (buf_size + 1) / 2); | |
| 184 |
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194 | if ((ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size)) < 0) |
| 185 | ✗ | return ret; | |
| 186 | |||
| 187 | /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */ | ||
| 188 | 194 | skip_bits(&a->gb, 32); | |
| 189 | |||
| 190 | 194 | a->qscale = get_bits(&a->gb, 16); | |
| 191 | 194 | a->version = get_bits(&a->gb, 16); | |
| 192 | |||
| 193 | 194 | a->last_dc[0] = a->last_dc[1] = a->last_dc[2] = 128; | |
| 194 | |||
| 195 |
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3932 | for (a->mb_x = 0; a->mb_x < a->mb_width; a->mb_x++) { |
| 196 |
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51353 | for (a->mb_y = 0; a->mb_y < a->mb_height; a->mb_y++) { |
| 197 |
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47615 | if ((ret = decode_mb(a, a->block)) < 0) |
| 198 | 1 | return ret; | |
| 199 | |||
| 200 | 47614 | idct_put(a, frame, a->mb_x, a->mb_y); | |
| 201 | } | ||
| 202 | } | ||
| 203 | |||
| 204 | 193 | *got_frame = 1; | |
| 205 | |||
| 206 | 193 | return (get_bits_count(&a->gb) + 31) / 32 * 4; | |
| 207 | } | ||
| 208 | |||
| 209 | 7 | static av_cold int decode_init(AVCodecContext *avctx) | |
| 210 | { | ||
| 211 | 7 | MDECContext * const a = avctx->priv_data; | |
| 212 | int i; | ||
| 213 | |||
| 214 | 7 | a->mb_width = (avctx->coded_width + 15) / 16; | |
| 215 | 7 | a->mb_height = (avctx->coded_height + 15) / 16; | |
| 216 | |||
| 217 | 7 | a->avctx = avctx; | |
| 218 | |||
| 219 | 7 | ff_blockdsp_init(&a->bdsp); | |
| 220 | 7 | ff_bswapdsp_init(&a->bbdsp); | |
| 221 | 7 | ff_idctdsp_init(&a->idsp, avctx); | |
| 222 | 7 | ff_mpeg12_init_vlcs(); | |
| 223 | 7 | ff_permute_scantable(a->permutated_scantable, ff_zigzag_direct, | |
| 224 | 7 | a->idsp.idct_permutation); | |
| 225 | |||
| 226 | 7 | avctx->pix_fmt = AV_PIX_FMT_YUVJ420P; | |
| 227 | 7 | avctx->color_range = AVCOL_RANGE_JPEG; | |
| 228 | |||
| 229 | /* init q matrix */ | ||
| 230 |
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455 | for (i = 0; i < 64; i++) { |
| 231 | 448 | int j = a->idsp.idct_permutation[i]; | |
| 232 | |||
| 233 | 448 | a->quant_matrix[j] = ff_mpeg1_default_intra_matrix[i]; | |
| 234 | } | ||
| 235 | |||
| 236 | 7 | return 0; | |
| 237 | } | ||
| 238 | |||
| 239 | 7 | static av_cold int decode_end(AVCodecContext *avctx) | |
| 240 | { | ||
| 241 | 7 | MDECContext * const a = avctx->priv_data; | |
| 242 | |||
| 243 | 7 | av_freep(&a->bitstream_buffer); | |
| 244 | 7 | a->bitstream_buffer_size = 0; | |
| 245 | |||
| 246 | 7 | return 0; | |
| 247 | } | ||
| 248 | |||
| 249 | const FFCodec ff_mdec_decoder = { | ||
| 250 | .p.name = "mdec", | ||
| 251 | CODEC_LONG_NAME("Sony PlayStation MDEC (Motion DECoder)"), | ||
| 252 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 253 | .p.id = AV_CODEC_ID_MDEC, | ||
| 254 | .priv_data_size = sizeof(MDECContext), | ||
| 255 | .init = decode_init, | ||
| 256 | .close = decode_end, | ||
| 257 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 258 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS, | ||
| 259 | }; | ||
| 260 |