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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Sony PlayStation MDEC (Motion DECoder) |
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| 3 | * Copyright (c) 2003 Michael Niedermayer |
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| 4 | * |
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| 5 | * based upon code from Sebastian Jedruszkiewicz |
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| 6 | * |
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| 7 | * This file is part of FFmpeg. |
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| 8 | * |
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| 9 | * FFmpeg is free software; you can redistribute it and/or |
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| 10 | * modify it under the terms of the GNU Lesser General Public |
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| 11 | * License as published by the Free Software Foundation; either |
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| 12 | * version 2.1 of the License, or (at your option) any later version. |
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| 13 | * |
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| 14 | * FFmpeg is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * Lesser General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU Lesser General Public |
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| 20 | * License along with FFmpeg; if not, write to the Free Software |
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| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |||
| 24 | /** |
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| 25 | * @file |
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| 26 | * Sony PlayStation MDEC (Motion DECoder) |
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| 27 | * This is very similar to intra-only MPEG-1. |
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| 28 | */ |
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| 29 | |||
| 30 | #include "avcodec.h" |
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| 31 | #include "mpegvideo.h" |
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| 32 | #include "mpeg12.h" |
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| 33 | #include "thread.h" |
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| 34 | |||
| 35 | typedef struct MDECContext { |
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| 36 | AVCodecContext *avctx; |
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| 37 | DSPContext dsp; |
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| 38 | ThreadFrame frame; |
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| 39 | GetBitContext gb; |
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| 40 | ScanTable scantable; |
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| 41 | int version; |
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| 42 | int qscale; |
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| 43 | int last_dc[3]; |
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| 44 | int mb_width; |
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| 45 | int mb_height; |
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| 46 | int mb_x, mb_y; |
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| 47 | DECLARE_ALIGNED(16, int16_t, block)[6][64]; |
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| 48 | uint8_t *bitstream_buffer; |
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| 49 | unsigned int bitstream_buffer_size; |
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| 50 | int block_last_index[6]; |
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| 51 | } MDECContext; |
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| 52 | |||
| 53 | //very similar to MPEG-1 |
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| 54 | static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n) |
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| 55 | { |
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| 56 | int level, diff, i, j, run; |
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| 57 | int component; |
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| 58 | RLTable *rl = &ff_rl_mpeg1; |
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| 59 | uint8_t * const scantable = a->scantable.permutated; |
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| 60 | const uint16_t *quant_matrix = ff_mpeg1_default_intra_matrix; |
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| 61 | const int qscale = a->qscale; |
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| 62 | |||
| 63 | /* DC coefficient */ |
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| 64 | if (a->version == 2) { |
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| 65 | block[0] = 2 * get_sbits(&a->gb, 10) + 1024; |
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| 66 | } else { |
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| 67 | component = (n <= 3 ? 0 : n - 4 + 1); |
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| 68 | diff = decode_dc(&a->gb, component); |
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| 69 | if (diff >= 0xffff) |
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| 70 | return AVERROR_INVALIDDATA; |
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| 71 | a->last_dc[component] += diff; |
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| 72 | block[0] = a->last_dc[component] << 3; |
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| 73 | } |
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| 74 | |||
| 75 | i = 0; |
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| 76 | { |
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| 77 | OPEN_READER(re, &a->gb); |
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| 78 | /* now quantify & encode AC coefficients */ |
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| 79 | for (;;) { |
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| 80 | UPDATE_CACHE(re, &a->gb); |
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| 81 | GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); |
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| 82 | |||
| 83 | if (level == 127) { |
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| 84 | break; |
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| 85 | } else if (level != 0) { |
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| 86 | i += run; |
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| 87 | j = scantable[i]; |
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| 88 | level = (level * qscale * quant_matrix[j]) >> 3; |
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| 89 | level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1); |
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| 90 | LAST_SKIP_BITS(re, &a->gb, 1); |
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| 91 | } else { |
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| 92 | /* escape */ |
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| 93 | run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6); |
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| 94 | UPDATE_CACHE(re, &a->gb); |
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| 95 | level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10); |
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| 96 | i += run; |
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| 97 | j = scantable[i]; |
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| 98 | if (level < 0) { |
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| 99 | level = -level; |
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| 100 | level = (level * qscale * quant_matrix[j]) >> 3; |
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| 101 | level = (level - 1) | 1; |
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| 102 | level = -level; |
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| 103 | } else { |
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| 104 | level = (level * qscale * quant_matrix[j]) >> 3; |
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| 105 | level = (level - 1) | 1; |
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| 106 | } |
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| 107 | } |
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| 108 | if (i > 63) { |
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| 109 | av_log(a->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y); |
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| 110 | return AVERROR_INVALIDDATA; |
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| 111 | } |
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| 112 | |||
| 113 | block[j] = level; |
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| 114 | } |
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| 115 | CLOSE_READER(re, &a->gb); |
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| 116 | } |
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| 117 | a->block_last_index[n] = i; |
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| 118 | return 0; |
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| 119 | } |
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| 120 | |||
| 121 | static inline int decode_mb(MDECContext *a, int16_t block[6][64]) |
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| 122 | { |
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| 123 | int i, ret; |
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| 124 | static const int block_index[6] = { 5, 4, 0, 1, 2, 3 }; |
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| 125 | |||
| 126 | a->dsp.clear_blocks(block[0]); |
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| 127 | |||
| 128 | for (i = 0; i < 6; i++) { |
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| 129 | if ((ret = mdec_decode_block_intra(a, block[block_index[i]], |
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| 130 | block_index[i])) < 0) |
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| 131 | return ret; |
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| 132 | if (get_bits_left(&a->gb) < 0) |
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| 133 | return AVERROR_INVALIDDATA; |
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| 134 | } |
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| 135 | return 0; |
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| 136 | } |
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| 137 | |||
| 138 | static inline void idct_put(MDECContext *a, AVFrame *frame, int mb_x, int mb_y) |
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| 139 | { |
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| 140 | int16_t (*block)[64] = a->block; |
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| 141 | int linesize = frame->linesize[0]; |
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| 142 | |||
| 143 | uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16; |
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| 144 | uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; |
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| 145 | uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; |
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| 146 | |||
| 147 | a->dsp.idct_put(dest_y, linesize, block[0]); |
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| 148 | a->dsp.idct_put(dest_y + 8, linesize, block[1]); |
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| 149 | a->dsp.idct_put(dest_y + 8 * linesize, linesize, block[2]); |
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| 150 | a->dsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]); |
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| 151 | |||
| 152 | if (!(a->avctx->flags & CODEC_FLAG_GRAY)) { |
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| 153 | a->dsp.idct_put(dest_cb, frame->linesize[1], block[4]); |
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| 154 | a->dsp.idct_put(dest_cr, frame->linesize[2], block[5]); |
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| 155 | } |
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| 156 | } |
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| 157 | |||
| 158 | static int decode_frame(AVCodecContext *avctx, |
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| 159 | void *data, int *got_frame, |
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| 160 | AVPacket *avpkt) |
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| 161 | { |
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| 162 | MDECContext * const a = avctx->priv_data; |
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| 163 | const uint8_t *buf = avpkt->data; |
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| 164 | int buf_size = avpkt->size; |
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| 165 | ThreadFrame frame = { .f = data }; |
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| 166 | int i, ret; |
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| 167 | |||
| 168 | if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) |
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| 169 | return ret; |
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| 170 | frame.f->pict_type = AV_PICTURE_TYPE_I; |
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| 171 | frame.f->key_frame = 1; |
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| 172 | |||
| 173 | av_fast_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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| 174 | if (!a->bitstream_buffer) |
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| 175 | return AVERROR(ENOMEM); |
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| 176 | for (i = 0; i < buf_size; i += 2) { |
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| 177 | a->bitstream_buffer[i] = buf[i + 1]; |
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| 178 | a->bitstream_buffer[i + 1] = buf[i]; |
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| 179 | } |
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| 180 | if ((ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size)) < 0) |
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| 181 | return ret; |
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| 182 | |||
| 183 | /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */ |
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| 184 | skip_bits(&a->gb, 32); |
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| 185 | |||
| 186 | a->qscale = get_bits(&a->gb, 16); |
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| 187 | a->version = get_bits(&a->gb, 16); |
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| 188 | |||
| 189 | a->last_dc[0] = a->last_dc[1] = a->last_dc[2] = 128; |
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| 190 | |||
| 191 | for (a->mb_x = 0; a->mb_x < a->mb_width; a->mb_x++) { |
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| 192 | for (a->mb_y = 0; a->mb_y < a->mb_height; a->mb_y++) { |
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| 193 | if ((ret = decode_mb(a, a->block)) < 0) |
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| 194 | return ret; |
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| 195 | |||
| 196 | idct_put(a, frame.f, a->mb_x, a->mb_y); |
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| 197 | } |
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| 198 | } |
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| 199 | |||
| 200 | *got_frame = 1; |
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| 201 | |||
| 202 | return (get_bits_count(&a->gb) + 31) / 32 * 4; |
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| 203 | } |
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| 204 | |||
| 205 | static av_cold int decode_init(AVCodecContext *avctx) |
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| 206 | { |
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| 207 | MDECContext * const a = avctx->priv_data; |
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| 208 | |||
| 209 | a->mb_width = (avctx->coded_width + 15) / 16; |
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| 210 | a->mb_height = (avctx->coded_height + 15) / 16; |
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| 211 | |||
| 212 | a->avctx = avctx; |
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| 213 | |||
| 214 | ff_dsputil_init(&a->dsp, avctx); |
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| 215 | ff_mpeg12_init_vlcs(); |
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| 216 | ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_zigzag_direct); |
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| 217 | |||
| 218 | if (avctx->idct_algo == FF_IDCT_AUTO) |
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| 219 | avctx->idct_algo = FF_IDCT_SIMPLE; |
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| 220 | avctx->pix_fmt = AV_PIX_FMT_YUVJ420P; |
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| 221 | |||
| 222 | return 0; |
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| 223 | } |
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| 224 | |||
| 225 | static av_cold int decode_init_thread_copy(AVCodecContext *avctx) |
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| 226 | { |
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| 227 | MDECContext * const a = avctx->priv_data; |
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| 228 | |||
| 229 | a->avctx = avctx; |
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| 230 | |||
| 231 | return 0; |
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| 232 | } |
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| 233 | |||
| 234 | static av_cold int decode_end(AVCodecContext *avctx) |
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| 235 | { |
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| 236 | MDECContext * const a = avctx->priv_data; |
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| 237 | |||
| 238 | av_freep(&a->bitstream_buffer); |
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| 239 | a->bitstream_buffer_size = 0; |
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| 240 | |||
| 241 | return 0; |
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| 242 | } |
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| 243 | |||
| 244 | AVCodec ff_mdec_decoder = { |
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| 245 | .name = "mdec", |
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| 246 | .long_name = NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"), |
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| 247 | .type = AVMEDIA_TYPE_VIDEO, |
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| 248 | .id = AV_CODEC_ID_MDEC, |
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| 249 | .priv_data_size = sizeof(MDECContext), |
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| 250 | .init = decode_init, |
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| 251 | .close = decode_end, |
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| 252 | .decode = decode_frame, |
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| 253 | .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, |
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| 254 | .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy) |
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| 255 | }; |