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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * Motion Pixels Video Decoder |
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| 3 | * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net) |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "avcodec.h" |
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| 23 | #include "get_bits.h" |
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| 24 | #include "dsputil.h" |
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| 25 | #include "internal.h" |
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| 26 | |||
| 27 | #define MAX_HUFF_CODES 16 |
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| 28 | |||
| 29 | #include "motionpixels_tablegen.h" |
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| 30 | |||
| 31 | typedef struct HuffCode { |
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| 32 | int code; |
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| 33 | uint8_t size; |
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| 34 | uint8_t delta; |
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| 35 | } HuffCode; |
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| 36 | |||
| 37 | typedef struct MotionPixelsContext { |
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| 38 | AVCodecContext *avctx; |
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| 39 | AVFrame frame; |
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| 40 | DSPContext dsp; |
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| 41 | uint8_t *changes_map; |
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| 42 | int offset_bits_len; |
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| 43 | int codes_count, current_codes_count; |
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| 44 | int max_codes_bits; |
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| 45 | HuffCode codes[MAX_HUFF_CODES]; |
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| 46 | VLC vlc; |
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| 47 | YuvPixel *vpt, *hpt; |
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| 48 | uint8_t gradient_scale[3]; |
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| 49 | uint8_t *bswapbuf; |
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| 50 | int bswapbuf_size; |
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| 51 | } MotionPixelsContext; |
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| 52 | |||
| 53 | static av_cold int mp_decode_init(AVCodecContext *avctx) |
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| 54 | { |
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| 55 | MotionPixelsContext *mp = avctx->priv_data; |
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| 56 | int w4 = (avctx->width + 3) & ~3; |
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| 57 | int h4 = (avctx->height + 3) & ~3; |
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| 58 | |||
| 59 | if(avctx->extradata_size < 2){ |
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| 60 | av_log(avctx, AV_LOG_ERROR, "extradata too small\n"); |
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| 61 | return AVERROR_INVALIDDATA; |
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| 62 | } |
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| 63 | |||
| 64 | motionpixels_tableinit(); |
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| 65 | mp->avctx = avctx; |
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| 66 | ff_dsputil_init(&mp->dsp, avctx); |
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| 67 | mp->changes_map = av_mallocz(avctx->width * h4); |
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| 68 | mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1; |
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| 69 | mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel)); |
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| 70 | mp->hpt = av_mallocz(h4 * w4 / 16 * sizeof(YuvPixel)); |
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| 71 | if (!mp->changes_map || !mp->vpt || !mp->hpt) { |
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| 72 | av_freep(&mp->changes_map); |
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| 73 | av_freep(&mp->vpt); |
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| 74 | av_freep(&mp->hpt); |
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| 75 | return AVERROR(ENOMEM); |
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| 76 | } |
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| 77 | avctx->pix_fmt = AV_PIX_FMT_RGB555; |
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| 78 | avcodec_get_frame_defaults(&mp->frame); |
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| 79 | return 0; |
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| 80 | } |
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| 81 | |||
| 82 | static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color) |
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| 83 | { |
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| 84 | uint16_t *pixels; |
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| 85 | int offset, w, h, color = 0, x, y, i; |
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| 86 | |||
| 87 | while (count--) { |
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| 88 | offset = get_bits_long(gb, mp->offset_bits_len); |
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| 89 | w = get_bits(gb, bits_len) + 1; |
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| 90 | h = get_bits(gb, bits_len) + 1; |
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| 91 | if (read_color) |
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| 92 | color = get_bits(gb, 15); |
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| 93 | x = offset % mp->avctx->width; |
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| 94 | y = offset / mp->avctx->width; |
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| 95 | if (y >= mp->avctx->height) |
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| 96 | continue; |
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| 97 | w = FFMIN(w, mp->avctx->width - x); |
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| 98 | h = FFMIN(h, mp->avctx->height - y); |
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| 99 | pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2]; |
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| 100 | while (h--) { |
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| 101 | mp->changes_map[offset] = w; |
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| 102 | if (read_color) |
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| 103 | for (i = 0; i < w; ++i) |
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| 104 | pixels[i] = color; |
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| 105 | offset += mp->avctx->width; |
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| 106 | pixels += mp->frame.linesize[0] / 2; |
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| 107 | } |
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| 108 | } |
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| 109 | } |
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| 110 | |||
| 111 | static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code) |
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| 112 | { |
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| 113 | while (get_bits1(gb)) { |
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| 114 | ++size; |
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| 115 | if (size > mp->max_codes_bits) { |
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| 116 | av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits); |
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| 117 | return AVERROR_INVALIDDATA; |
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| 118 | } |
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| 119 | code <<= 1; |
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| 120 | if (mp_get_code(mp, gb, size, code + 1) < 0) |
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| 121 | return AVERROR_INVALIDDATA; |
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| 122 | } |
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| 123 | if (mp->current_codes_count >= MAX_HUFF_CODES) { |
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| 124 | av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n"); |
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| 125 | return AVERROR_INVALIDDATA; |
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| 126 | } |
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| 127 | |||
| 128 | mp->codes[mp->current_codes_count ].code = code; |
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| 129 | mp->codes[mp->current_codes_count++].size = size; |
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| 130 | return 0; |
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| 131 | } |
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| 132 | |||
| 133 | static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb) |
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| 134 | { |
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| 135 | if (mp->codes_count == 1) { |
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| 136 | mp->codes[0].delta = get_bits(gb, 4); |
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| 137 | } else { |
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| 138 | int i; |
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| 139 | int ret; |
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| 140 | |||
| 141 | mp->max_codes_bits = get_bits(gb, 4); |
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| 142 | for (i = 0; i < mp->codes_count; ++i) |
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| 143 | mp->codes[i].delta = get_bits(gb, 4); |
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| 144 | mp->current_codes_count = 0; |
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| 145 | if ((ret = mp_get_code(mp, gb, 0, 0)) < 0) |
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| 146 | return ret; |
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| 147 | if (mp->current_codes_count < mp->codes_count) { |
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| 148 | av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n"); |
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| 149 | return AVERROR_INVALIDDATA; |
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| 150 | } |
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| 151 | } |
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| 152 | return 0; |
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| 153 | } |
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| 154 | |||
| 155 | static int mp_gradient(MotionPixelsContext *mp, int component, int v) |
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| 156 | { |
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| 157 | int delta; |
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| 158 | |||
| 159 | delta = (v - 7) * mp->gradient_scale[component]; |
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| 160 | mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1; |
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| 161 | return delta; |
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| 162 | } |
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| 163 | |||
| 164 | static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y) |
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| 165 | { |
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| 166 | int color; |
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| 167 | |||
| 168 | color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2]; |
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| 169 | return mp_rgb_yuv_table[color]; |
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| 170 | } |
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| 171 | |||
| 172 | static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p) |
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| 173 | { |
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| 174 | int color; |
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| 175 | |||
| 176 | color = mp_yuv_to_rgb(p->y, p->v, p->u, 1); |
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| 177 | *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color; |
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| 178 | } |
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| 179 | |||
| 180 | static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb) |
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| 181 | { |
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| 182 | int i; |
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| 183 | |||
| 184 | i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1); |
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| 185 | return mp->codes[i].delta; |
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| 186 | } |
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| 187 | |||
| 188 | static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y) |
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| 189 | { |
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| 190 | YuvPixel p; |
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| 191 | const int y0 = y * mp->avctx->width; |
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| 192 | int w, i, x = 0; |
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| 193 | |||
| 194 | p = mp->vpt[y]; |
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| 195 | if (mp->changes_map[y0 + x] == 0) { |
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| 196 | memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); |
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| 197 | ++x; |
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| 198 | } |
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| 199 | while (x < mp->avctx->width) { |
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| 200 | w = mp->changes_map[y0 + x]; |
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| 201 | if (w != 0) { |
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| 202 | if ((y & 3) == 0) { |
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| 203 | if (mp->changes_map[y0 + x + mp->avctx->width] < w || |
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| 204 | mp->changes_map[y0 + x + mp->avctx->width * 2] < w || |
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| 205 | mp->changes_map[y0 + x + mp->avctx->width * 3] < w) { |
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| 206 | for (i = (x + 3) & ~3; i < x + w; i += 4) { |
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| 207 | mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y); |
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| 208 | } |
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| 209 | } |
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| 210 | } |
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| 211 | x += w; |
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| 212 | memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); |
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| 213 | p = mp_get_yuv_from_rgb(mp, x - 1, y); |
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| 214 | } else { |
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| 215 | p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb)); |
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| 216 | p.y = av_clip(p.y, 0, 31); |
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| 217 | if ((x & 3) == 0) { |
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| 218 | if ((y & 3) == 0) { |
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| 219 | p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); |
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| 220 | p.v = av_clip(p.v, -32, 31); |
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| 221 | p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); |
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| 222 | p.u = av_clip(p.u, -32, 31); |
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| 223 | mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p; |
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| 224 | } else { |
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| 225 | p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v; |
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| 226 | p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u; |
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| 227 | } |
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| 228 | } |
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| 229 | mp_set_rgb_from_yuv(mp, x, y, &p); |
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| 230 | ++x; |
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| 231 | } |
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| 232 | } |
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| 233 | } |
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| 234 | |||
| 235 | static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb) |
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| 236 | { |
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| 237 | YuvPixel p; |
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| 238 | int y, y0; |
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| 239 | |||
| 240 | av_assert1(mp->changes_map[0]); |
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| 241 | |||
| 242 | for (y = 0; y < mp->avctx->height; ++y) { |
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| 243 | if (mp->changes_map[y * mp->avctx->width] != 0) { |
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| 244 | memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); |
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| 245 | p = mp_get_yuv_from_rgb(mp, 0, y); |
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| 246 | } else { |
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| 247 | p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb)); |
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| 248 | p.y = av_clip(p.y, 0, 31); |
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| 249 | if ((y & 3) == 0) { |
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| 250 | p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); |
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| 251 | p.v = av_clip(p.v, -32, 31); |
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| 252 | p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); |
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| 253 | p.u = av_clip(p.u, -32, 31); |
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| 254 | } |
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| 255 | mp->vpt[y] = p; |
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| 256 | mp_set_rgb_from_yuv(mp, 0, y, &p); |
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| 257 | } |
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| 258 | } |
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| 259 | for (y0 = 0; y0 < 2; ++y0) |
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| 260 | for (y = y0; y < mp->avctx->height; y += 2) |
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| 261 | mp_decode_line(mp, gb, y); |
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| 262 | } |
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| 263 | |||
| 264 | static int mp_decode_frame(AVCodecContext *avctx, |
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| 265 | void *data, int *got_frame, |
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| 266 | AVPacket *avpkt) |
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| 267 | { |
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| 268 | const uint8_t *buf = avpkt->data; |
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| 269 | int buf_size = avpkt->size; |
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| 270 | MotionPixelsContext *mp = avctx->priv_data; |
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| 271 | GetBitContext gb; |
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| 272 | int i, count1, count2, sz, ret; |
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| 273 | |||
| 274 | if ((ret = ff_reget_buffer(avctx, &mp->frame)) < 0) |
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| 275 | return ret; |
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| 276 | |||
| 277 | /* le32 bitstream msb first */ |
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| 278 | av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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| 279 | if (!mp->bswapbuf) |
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| 280 | return AVERROR(ENOMEM); |
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| 281 | mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4); |
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| 282 | if (buf_size & 3) |
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| 283 | memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3); |
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| 284 | memset(mp->bswapbuf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); |
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| 285 | init_get_bits(&gb, mp->bswapbuf, buf_size * 8); |
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| 286 | |||
| 287 | memset(mp->changes_map, 0, avctx->width * avctx->height); |
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| 288 | for (i = !(avctx->extradata[1] & 2); i < 2; ++i) { |
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| 289 | count1 = get_bits(&gb, 12); |
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| 290 | count2 = get_bits(&gb, 12); |
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| 291 | mp_read_changes_map(mp, &gb, count1, 8, i); |
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| 292 | mp_read_changes_map(mp, &gb, count2, 4, i); |
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| 293 | } |
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| 294 | |||
| 295 | mp->codes_count = get_bits(&gb, 4); |
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| 296 | if (mp->codes_count == 0) |
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| 297 | goto end; |
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| 298 | |||
| 299 | if (mp->changes_map[0] == 0) { |
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| 300 | *(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15); |
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| 301 | mp->changes_map[0] = 1; |
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| 302 | } |
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| 303 | if (mp_read_codes_table(mp, &gb) < 0) |
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| 304 | goto end; |
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| 305 | |||
| 306 | sz = get_bits(&gb, 18); |
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| 307 | if (avctx->extradata[0] != 5) |
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| 308 | sz += get_bits(&gb, 18); |
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| 309 | if (sz == 0) |
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| 310 | goto end; |
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| 311 | |||
| 312 | if (mp->max_codes_bits <= 0) |
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| 313 | goto end; |
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| 314 | if (init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0)) |
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| 315 | goto end; |
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| 316 | mp_decode_frame_helper(mp, &gb); |
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| 317 | ff_free_vlc(&mp->vlc); |
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| 318 | |||
| 319 | end: |
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| 320 | if ((ret = av_frame_ref(data, &mp->frame)) < 0) |
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| 321 | return ret; |
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| 322 | *got_frame = 1; |
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| 323 | return buf_size; |
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| 324 | } |
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| 325 | |||
| 326 | static av_cold int mp_decode_end(AVCodecContext *avctx) |
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| 327 | { |
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| 328 | MotionPixelsContext *mp = avctx->priv_data; |
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| 329 | |||
| 330 | av_freep(&mp->changes_map); |
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| 331 | av_freep(&mp->vpt); |
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| 332 | av_freep(&mp->hpt); |
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| 333 | av_freep(&mp->bswapbuf); |
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| 334 | av_frame_unref(&mp->frame); |
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| 335 | |||
| 336 | return 0; |
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| 337 | } |
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| 338 | |||
| 339 | AVCodec ff_motionpixels_decoder = { |
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| 340 | .name = "motionpixels", |
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| 341 | .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"), |
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| 342 | .type = AVMEDIA_TYPE_VIDEO, |
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| 343 | .id = AV_CODEC_ID_MOTIONPIXELS, |
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| 344 | .priv_data_size = sizeof(MotionPixelsContext), |
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| 345 | .init = mp_decode_init, |
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| 346 | .close = mp_decode_end, |
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| 347 | .decode = mp_decode_frame, |
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| 348 | .capabilities = CODEC_CAP_DR1, |
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| 349 | }; |