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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Silicon Graphics Motion Video Compressor 1 & 2 decoder |
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| 3 | * Copyright (c) 2012 Peter Ross |
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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 | /** |
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| 23 | * @file |
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| 24 | * Silicon Graphics Motion Video Compressor 1 & 2 decoder |
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| 25 | */ |
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| 26 | |||
| 27 | #include "libavutil/intreadwrite.h" |
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| 28 | #include "avcodec.h" |
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| 29 | #include "bytestream.h" |
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| 30 | #include "internal.h" |
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| 31 | |||
| 32 | typedef struct MvcContext { |
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| 33 | AVFrame *frame; |
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| 34 | int vflip; |
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| 35 | } MvcContext; |
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| 36 | |||
| 37 | static av_cold int mvc_decode_init(AVCodecContext *avctx) |
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| 38 | { |
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| 39 | MvcContext *s = avctx->priv_data; |
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| 40 | int width = avctx->width; |
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| 41 | int height = avctx->height; |
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| 42 | |||
| 43 | if (avctx->codec_id == AV_CODEC_ID_MVC1) { |
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| 44 | width += 3; |
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| 45 | height += 3; |
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| 46 | } |
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| 47 | width &= ~3; |
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| 48 | height &= ~3; |
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| 49 | if (width != avctx->width || height != avctx->height) |
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| 50 | avcodec_set_dimensions(avctx, width, height); |
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| 51 | |||
| 52 | avctx->pix_fmt = (avctx->codec_id == AV_CODEC_ID_MVC1) ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_BGRA; |
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| 53 | s->frame = av_frame_alloc(); |
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| 54 | if (!s->frame) |
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| 55 | return AVERROR(ENOMEM); |
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| 56 | |||
| 57 | s->vflip = avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9); |
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| 58 | return 0; |
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| 59 | } |
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| 60 | |||
| 61 | static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize) |
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| 62 | { |
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| 63 | uint8_t *dst; |
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| 64 | uint16_t v[8]; |
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| 65 | int mask, x, y, i; |
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| 66 | |||
| 67 | x = y= 0; |
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| 68 | while (bytestream2_get_bytes_left(gb) >= 6) { |
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| 69 | mask = bytestream2_get_be16u(gb); |
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| 70 | v[0] = bytestream2_get_be16u(gb); |
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| 71 | v[1] = bytestream2_get_be16u(gb); |
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| 72 | if ((v[0] & 0x8000)) { |
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| 73 | if (bytestream2_get_bytes_left(gb) < 12) { |
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| 74 | av_log(avctx, AV_LOG_WARNING, "buffer overflow\n"); |
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| 75 | return AVERROR_INVALIDDATA; |
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| 76 | } |
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| 77 | for (i = 2; i < 8; i++) |
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| 78 | v[i] = bytestream2_get_be16u(gb); |
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| 79 | } else { |
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| 80 | v[2] = v[4] = v[6] = v[0]; |
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| 81 | v[3] = v[5] = v[7] = v[1]; |
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| 82 | } |
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| 83 | |||
| 84 | #define PIX16(target, true, false) \ |
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| 85 | i = (mask & target) ? true : false; \ |
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| 86 | AV_WN16A(dst, (v[i] & 0x7C00) | (v[i] & 0x3E0) | (v[i] & 0x1F)); \ |
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| 87 | dst += 2; |
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| 88 | |||
| 89 | #define ROW16(row, a1, a0, b1, b0) \ |
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| 90 | dst = dst_start + (y + row) * linesize + x * 2; \ |
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| 91 | PIX16(1 << (row * 4), a1, a0) \ |
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| 92 | PIX16(1 << (row * 4 + 1), a1, a0) \ |
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| 93 | PIX16(1 << (row * 4 + 2), b1, b0) \ |
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| 94 | PIX16(1 << (row * 4 + 3), b1, b0) |
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| 95 | |||
| 96 | ROW16(0, 0, 1, 2, 3); |
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| 97 | ROW16(1, 0, 1, 2, 3); |
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| 98 | ROW16(2, 4, 5, 6, 7); |
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| 99 | ROW16(3, 4, 5, 6, 7); |
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| 100 | |||
| 101 | x += 4; |
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| 102 | if (x >= width) { |
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| 103 | y += 4; |
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| 104 | if (y >= height) { |
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| 105 | break; |
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| 106 | } |
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| 107 | x = 0; |
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| 108 | } |
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| 109 | } |
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| 110 | return 0; |
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| 111 | } |
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| 112 | |||
| 113 | static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel) |
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| 114 | { |
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| 115 | int i, j; |
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| 116 | for (j = 0; j < 4; j++) |
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| 117 | for (i = 0; i < 4; i++) |
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| 118 | AV_WN32A(dst + j * linesize + i * 4, pixel); |
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| 119 | } |
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| 120 | |||
| 121 | #define PIX32(target, true, false) \ |
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| 122 | AV_WN32A(dst, (mask & target) ? v[true] : v[false]); \ |
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| 123 | dst += 4; |
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| 124 | |||
| 125 | #define ROW32(row, a1, a0, b1, b0) \ |
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| 126 | dst = dst_start + (y + row) * linesize + x * 4; \ |
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| 127 | PIX32(1 << (row * 4), a1, a0) \ |
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| 128 | PIX32(1 << (row * 4 + 1), a1, a0) \ |
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| 129 | PIX32(1 << (row * 4 + 2), b1, b0) \ |
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| 130 | PIX32(1 << (row * 4 + 3), b1, b0) |
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| 131 | |||
| 132 | #define MVC2_BLOCK \ |
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| 133 | ROW32(0, 1, 0, 3, 2); \ |
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| 134 | ROW32(1, 1, 0, 3, 2); \ |
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| 135 | ROW32(2, 5, 4, 7, 6); \ |
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| 136 | ROW32(3, 5, 4, 7, 6); |
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| 137 | |||
| 138 | static int decode_mvc2(AVCodecContext *avctx, GetByteContext *gb, uint8_t *dst_start, int width, int height, int linesize, int vflip) |
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| 139 | { |
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| 140 | uint8_t *dst; |
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| 141 | uint32_t color[128], v[8]; |
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| 142 | int w, h, nb_colors, i, x, y, p0, p1, mask; |
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| 143 | |||
| 144 | if (bytestream2_get_bytes_left(gb) < 6) |
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| 145 | return AVERROR_INVALIDDATA; |
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| 146 | |||
| 147 | w = bytestream2_get_be16u(gb); |
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| 148 | h = bytestream2_get_be16u(gb); |
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| 149 | if ((w & ~3) != width || (h & ~3) != height) |
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| 150 | av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n"); |
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| 151 | |||
| 152 | if (bytestream2_get_byteu(gb)) { |
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| 153 | avpriv_request_sample(avctx, "bitmap feature"); |
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| 154 | return AVERROR_PATCHWELCOME; |
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| 155 | } |
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| 156 | |||
| 157 | nb_colors = bytestream2_get_byteu(gb); |
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| 158 | if (bytestream2_get_bytes_left(gb) < nb_colors * 3) |
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| 159 | return AVERROR_INVALIDDATA; |
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| 160 | for (i = 0; i < FFMIN(nb_colors, 128); i++) |
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| 161 | color[i] = 0xFF000000 | bytestream2_get_be24u(gb); |
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| 162 | if (nb_colors > 128) |
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| 163 | bytestream2_skip(gb, (nb_colors - 128) * 3); |
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| 164 | |||
| 165 | if (vflip) { |
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| 166 | dst_start += (height - 1) * linesize; |
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| 167 | linesize = -linesize; |
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| 168 | } |
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| 169 | x = y = 0; |
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| 170 | while (bytestream2_get_bytes_left(gb) >= 1) { |
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| 171 | p0 = bytestream2_get_byteu(gb); |
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| 172 | if ((p0 & 0x80)) { |
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| 173 | if ((p0 & 0x40)) { |
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| 174 | p0 &= 0x3F; |
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| 175 | p0 = (p0 << 2) | (p0 >> 4); |
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| 176 | set_4x4_block(dst_start + y * linesize + x * 4, linesize, 0xFF000000 | (p0 << 16) | (p0 << 8) | p0); |
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| 177 | } else { |
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| 178 | int g, r; |
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| 179 | p0 &= 0x3F; |
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| 180 | p0 = (p0 << 2) | (p0 >> 4); |
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| 181 | if (bytestream2_get_bytes_left(gb) < 2) |
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| 182 | return AVERROR_INVALIDDATA; |
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| 183 | g = bytestream2_get_byteu(gb); |
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| 184 | r = bytestream2_get_byteu(gb); |
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| 185 | set_4x4_block(dst_start + y * linesize + x * 4, linesize, 0xFF000000 | (r << 16) | (g << 8) | p0); |
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| 186 | } |
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| 187 | } else { |
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| 188 | if (bytestream2_get_bytes_left(gb) < 1) |
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| 189 | return AVERROR_INVALIDDATA; |
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| 190 | p1 = bytestream2_get_byteu(gb); |
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| 191 | if ((p1 & 0x80)) { |
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| 192 | if ((p0 & 0x7F) == (p1 & 0x7F)) { |
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| 193 | set_4x4_block(dst_start + y * linesize + x * 4, linesize, color[p0 & 0x7F]); |
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| 194 | } else { |
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| 195 | if (bytestream2_get_bytes_left(gb) < 2) |
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| 196 | return AVERROR_INVALIDDATA; |
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| 197 | v[0] = v[2] = v[4] = v[6] = color[p0 & 0x7F]; |
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| 198 | v[1] = v[3] = v[5] = v[7] = color[p1 & 0x7F]; |
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| 199 | mask = bytestream2_get_le16u(gb); |
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| 200 | MVC2_BLOCK |
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| 201 | } |
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| 202 | } else { |
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| 203 | if (bytestream2_get_bytes_left(gb) < 8) |
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| 204 | return AVERROR_INVALIDDATA; |
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| 205 | v[0] = color[p0 & 0x7F]; |
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| 206 | v[1] = color[p1 & 0x7F]; |
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| 207 | for (i = 2; i < 8; i++) |
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| 208 | v[i] = color[bytestream2_get_byteu(gb) & 0x7F]; |
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| 209 | mask = bytestream2_get_le16u(gb); |
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| 210 | MVC2_BLOCK |
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| 211 | } |
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| 212 | } |
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| 213 | |||
| 214 | x += 4; |
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| 215 | if (x >= width) { |
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| 216 | y += 4; |
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| 217 | if (y >= height) |
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| 218 | break; |
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| 219 | x = 0; |
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| 220 | } |
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| 221 | } |
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| 222 | return 0; |
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| 223 | } |
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| 224 | |||
| 225 | static int mvc_decode_frame(AVCodecContext *avctx, |
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| 226 | void *data, int *got_frame, |
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| 227 | AVPacket *avpkt) |
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| 228 | { |
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| 229 | MvcContext *s = avctx->priv_data; |
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| 230 | GetByteContext gb; |
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| 231 | int ret; |
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| 232 | |||
| 233 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
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| 234 | return ret; |
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| 235 | |||
| 236 | bytestream2_init(&gb, avpkt->data, avpkt->size); |
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| 237 | if (avctx->codec_id == AV_CODEC_ID_MVC1) |
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| 238 | ret = decode_mvc1(avctx, &gb, s->frame->data[0], avctx->width, avctx->height, s->frame->linesize[0]); |
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| 239 | else |
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| 240 | ret = decode_mvc2(avctx, &gb, s->frame->data[0], avctx->width, avctx->height, s->frame->linesize[0], s->vflip); |
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| 241 | if (ret < 0) |
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| 242 | return ret; |
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| 243 | |||
| 244 | *got_frame = 1; |
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| 245 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
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| 246 | return ret; |
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| 247 | |||
| 248 | return avpkt->size; |
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| 249 | } |
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| 250 | |||
| 251 | static av_cold int mvc_decode_end(AVCodecContext *avctx) |
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| 252 | { |
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| 253 | MvcContext *s = avctx->priv_data; |
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| 254 | |||
| 255 | av_frame_free(&s->frame); |
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| 256 | |||
| 257 | return 0; |
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| 258 | } |
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| 259 | |||
| 260 | #if CONFIG_MVC1_DECODER |
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| 261 | AVCodec ff_mvc1_decoder = { |
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| 262 | .name = "mvc1", |
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| 263 | .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"), |
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| 264 | .type = AVMEDIA_TYPE_VIDEO, |
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| 265 | .id = AV_CODEC_ID_MVC1, |
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| 266 | .priv_data_size = sizeof(MvcContext), |
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| 267 | .init = mvc_decode_init, |
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| 268 | .close = mvc_decode_end, |
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| 269 | .decode = mvc_decode_frame, |
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| 270 | .capabilities = CODEC_CAP_DR1, |
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| 271 | }; |
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| 272 | #endif |
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| 273 | |||
| 274 | #if CONFIG_MVC2_DECODER |
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| 275 | AVCodec ff_mvc2_decoder = { |
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| 276 | .name = "mvc2", |
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| 277 | .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"), |
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| 278 | .type = AVMEDIA_TYPE_VIDEO, |
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| 279 | .id = AV_CODEC_ID_MVC2, |
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| 280 | .priv_data_size = sizeof(MvcContext), |
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| 281 | .init = mvc_decode_init, |
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| 282 | .close = mvc_decode_end, |
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| 283 | .decode = mvc_decode_frame, |
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| 284 | .capabilities = CODEC_CAP_DR1, |
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| 285 | }; |
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| 286 | #endif |