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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * BMP image format decoder |
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| 3 | * Copyright (c) 2005 Mans Rullgard |
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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 "bytestream.h" |
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| 24 | #include "bmp.h" |
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| 25 | #include "internal.h" |
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| 26 | #include "msrledec.h" |
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| 27 | |||
| 28 | static int bmp_decode_frame(AVCodecContext *avctx, |
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| 29 | void *data, int *got_frame, |
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| 30 | AVPacket *avpkt) |
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| 31 | { |
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| 32 | const uint8_t *buf = avpkt->data; |
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| 33 | int buf_size = avpkt->size; |
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| 34 | AVFrame *p = data; |
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| 35 | unsigned int fsize, hsize; |
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| 36 | int width, height; |
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| 37 | unsigned int depth; |
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| 38 | BiCompression comp; |
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| 39 | unsigned int ihsize; |
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| 40 | int i, j, n, linesize, ret; |
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| 41 | uint32_t rgb[3] = {0}; |
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| 42 | uint32_t alpha = 0; |
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| 43 | uint8_t *ptr; |
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| 44 | int dsize; |
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| 45 | const uint8_t *buf0 = buf; |
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| 46 | GetByteContext gb; |
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| 47 | |||
| 48 | if (buf_size < 14) { |
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| 49 | av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size); |
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| 50 | return AVERROR_INVALIDDATA; |
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| 51 | } |
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| 52 | |||
| 53 | if (bytestream_get_byte(&buf) != 'B' || |
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| 54 | bytestream_get_byte(&buf) != 'M') { |
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| 55 | av_log(avctx, AV_LOG_ERROR, "bad magic number\n"); |
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| 56 | return AVERROR_INVALIDDATA; |
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| 57 | } |
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| 58 | |||
| 59 | fsize = bytestream_get_le32(&buf); |
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| 60 | if (buf_size < fsize) { |
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| 61 | av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d), trying to decode anyway\n", |
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| 62 | buf_size, fsize); |
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| 63 | fsize = buf_size; |
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| 64 | } |
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| 65 | |||
| 66 | buf += 2; /* reserved1 */ |
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| 67 | buf += 2; /* reserved2 */ |
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| 68 | |||
| 69 | hsize = bytestream_get_le32(&buf); /* header size */ |
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| 70 | ihsize = bytestream_get_le32(&buf); /* more header size */ |
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| 71 | if (ihsize + 14 > hsize) { |
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| 72 | av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize); |
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| 73 | return AVERROR_INVALIDDATA; |
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| 74 | } |
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| 75 | |||
| 76 | /* sometimes file size is set to some headers size, set a real size in that case */ |
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| 77 | if (fsize == 14 || fsize == ihsize + 14) |
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| 78 | fsize = buf_size - 2; |
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| 79 | |||
| 80 | if (fsize <= hsize) { |
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| 81 | av_log(avctx, AV_LOG_ERROR, "declared file size is less than header size (%d < %d)\n", |
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| 82 | fsize, hsize); |
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| 83 | return AVERROR_INVALIDDATA; |
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| 84 | } |
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| 85 | |||
| 86 | switch (ihsize) { |
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| 87 | case 40: // windib |
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| 88 | case 56: // windib v3 |
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| 89 | case 64: // OS/2 v2 |
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| 90 | case 108: // windib v4 |
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| 91 | case 124: // windib v5 |
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| 92 | width = bytestream_get_le32(&buf); |
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| 93 | height = bytestream_get_le32(&buf); |
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| 94 | break; |
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| 95 | case 12: // OS/2 v1 |
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| 96 | width = bytestream_get_le16(&buf); |
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| 97 | height = bytestream_get_le16(&buf); |
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| 98 | break; |
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| 99 | default: |
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| 100 | av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n"); |
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| 101 | return AVERROR_PATCHWELCOME; |
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| 102 | } |
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| 103 | |||
| 104 | /* planes */ |
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| 105 | if (bytestream_get_le16(&buf) != 1) { |
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| 106 | av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n"); |
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| 107 | return AVERROR_INVALIDDATA; |
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| 108 | } |
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| 109 | |||
| 110 | depth = bytestream_get_le16(&buf); |
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| 111 | |||
| 112 | if (ihsize >= 40) |
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| 113 | comp = bytestream_get_le32(&buf); |
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| 114 | else |
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| 115 | comp = BMP_RGB; |
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| 116 | |||
| 117 | if (comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 && |
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| 118 | comp != BMP_RLE8) { |
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| 119 | av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp); |
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| 120 | return AVERROR_INVALIDDATA; |
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| 121 | } |
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| 122 | |||
| 123 | if (comp == BMP_BITFIELDS) { |
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| 124 | buf += 20; |
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| 125 | rgb[0] = bytestream_get_le32(&buf); |
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| 126 | rgb[1] = bytestream_get_le32(&buf); |
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| 127 | rgb[2] = bytestream_get_le32(&buf); |
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| 128 | alpha = bytestream_get_le32(&buf); |
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| 129 | } |
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| 130 | |||
| 131 | avctx->width = width; |
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| 132 | avctx->height = height > 0 ? height : -height; |
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| 133 | |||
| 134 | avctx->pix_fmt = AV_PIX_FMT_NONE; |
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| 135 | |||
| 136 | switch (depth) { |
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| 137 | case 32: |
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| 138 | if (comp == BMP_BITFIELDS) { |
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| 139 | if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00) |
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| 140 | avctx->pix_fmt = alpha ? AV_PIX_FMT_ABGR : AV_PIX_FMT_0BGR; |
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| 141 | else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF) |
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| 142 | avctx->pix_fmt = alpha ? AV_PIX_FMT_BGRA : AV_PIX_FMT_BGR0; |
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| 143 | else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000) |
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| 144 | avctx->pix_fmt = alpha ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB; |
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| 145 | else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000) |
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| 146 | avctx->pix_fmt = alpha ? AV_PIX_FMT_RGBA : AV_PIX_FMT_RGB0; |
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| 147 | else { |
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| 148 | av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]); |
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| 149 | return AVERROR(EINVAL); |
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| 150 | } |
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| 151 | } else { |
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| 152 | avctx->pix_fmt = AV_PIX_FMT_BGRA; |
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| 153 | } |
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| 154 | break; |
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| 155 | case 24: |
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| 156 | avctx->pix_fmt = AV_PIX_FMT_BGR24; |
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| 157 | break; |
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| 158 | case 16: |
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| 159 | if (comp == BMP_RGB) |
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| 160 | avctx->pix_fmt = AV_PIX_FMT_RGB555; |
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| 161 | else if (comp == BMP_BITFIELDS) { |
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| 162 | if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F) |
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| 163 | avctx->pix_fmt = AV_PIX_FMT_RGB565; |
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| 164 | else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F) |
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| 165 | avctx->pix_fmt = AV_PIX_FMT_RGB555; |
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| 166 | else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F) |
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| 167 | avctx->pix_fmt = AV_PIX_FMT_RGB444; |
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| 168 | else { |
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| 169 | av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]); |
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| 170 | return AVERROR(EINVAL); |
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| 171 | } |
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| 172 | } |
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| 173 | break; |
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| 174 | case 8: |
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| 175 | if (hsize - ihsize - 14 > 0) |
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| 176 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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| 177 | else |
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| 178 | avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
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| 179 | break; |
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| 180 | case 1: |
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| 181 | case 4: |
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| 182 | if (hsize - ihsize - 14 > 0) { |
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| 183 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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| 184 | } else { |
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| 185 | av_log(avctx, AV_LOG_ERROR, "Unknown palette for %d-colour BMP\n", 1< |
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| 186 | return AVERROR_INVALIDDATA; |
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| 187 | } |
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| 188 | break; |
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| 189 | default: |
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| 190 | av_log(avctx, AV_LOG_ERROR, "depth %d not supported\n", depth); |
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| 191 | return AVERROR_INVALIDDATA; |
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| 192 | } |
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| 193 | |||
| 194 | if (avctx->pix_fmt == AV_PIX_FMT_NONE) { |
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| 195 | av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n"); |
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| 196 | return AVERROR_INVALIDDATA; |
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| 197 | } |
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| 198 | |||
| 199 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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| 200 | return ret; |
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| 201 | p->pict_type = AV_PICTURE_TYPE_I; |
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| 202 | p->key_frame = 1; |
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| 203 | |||
| 204 | buf = buf0 + hsize; |
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| 205 | dsize = buf_size - hsize; |
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| 206 | |||
| 207 | /* Line size in file multiple of 4 */ |
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| 208 | n = ((avctx->width * depth + 31) / 8) & ~3; |
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| 209 | |||
| 210 | if (n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8) { |
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| 211 | av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n", |
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| 212 | dsize, n * avctx->height); |
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| 213 | return AVERROR_INVALIDDATA; |
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| 214 | } |
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| 215 | |||
| 216 | // RLE may skip decoding some picture areas, so blank picture before decoding |
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| 217 | if (comp == BMP_RLE4 || comp == BMP_RLE8) |
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| 218 | memset(p->data[0], 0, avctx->height * p->linesize[0]); |
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| 219 | |||
| 220 | if (height > 0) { |
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| 221 | ptr = p->data[0] + (avctx->height - 1) * p->linesize[0]; |
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| 222 | linesize = -p->linesize[0]; |
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| 223 | } else { |
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| 224 | ptr = p->data[0]; |
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| 225 | linesize = p->linesize[0]; |
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| 226 | } |
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| 227 | |||
| 228 | if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { |
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| 229 | int colors = 1 << depth; |
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| 230 | |||
| 231 | memset(p->data[1], 0, 1024); |
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| 232 | |||
| 233 | if (ihsize >= 36) { |
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| 234 | int t; |
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| 235 | buf = buf0 + 46; |
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| 236 | t = bytestream_get_le32(&buf); |
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| 237 | if (t < 0 || t > (1 << depth)) { |
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| 238 | av_log(avctx, AV_LOG_ERROR, "Incorrect number of colors - %X for bitdepth %d\n", t, depth); |
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| 239 | } else if (t) { |
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| 240 | colors = t; |
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| 241 | } |
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| 242 | } |
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| 243 | buf = buf0 + 14 + ihsize; //palette location |
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| 244 | // OS/2 bitmap, 3 bytes per palette entry |
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| 245 | if ((hsize-ihsize-14) < (colors << 2)) { |
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| 246 | if ((hsize-ihsize-14) < colors * 3) { |
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| 247 | av_log(avctx, AV_LOG_ERROR, "palette doesn't fit in packet\n"); |
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| 248 | return AVERROR_INVALIDDATA; |
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| 249 | } |
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| 250 | for (i = 0; i < colors; i++) |
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| 251 | ((uint32_t*)p->data[1])[i] = (0xFFU<<24) | bytestream_get_le24(&buf); |
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| 252 | } else { |
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| 253 | for (i = 0; i < colors; i++) |
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| 254 | ((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf); |
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| 255 | } |
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| 256 | buf = buf0 + hsize; |
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| 257 | } |
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| 258 | if (comp == BMP_RLE4 || comp == BMP_RLE8) { |
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| 259 | if (comp == BMP_RLE8 && height < 0) { |
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| 260 | p->data[0] += p->linesize[0] * (avctx->height - 1); |
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| 261 | p->linesize[0] = -p->linesize[0]; |
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| 262 | } |
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| 263 | bytestream2_init(&gb, buf, dsize); |
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| 264 | ff_msrle_decode(avctx, (AVPicture*)p, depth, &gb); |
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| 265 | if (height < 0) { |
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| 266 | p->data[0] += p->linesize[0] * (avctx->height - 1); |
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| 267 | p->linesize[0] = -p->linesize[0]; |
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| 268 | } |
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| 269 | } else { |
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| 270 | switch (depth) { |
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| 271 | case 1: |
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| 272 | for (i = 0; i < avctx->height; i++) { |
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| 273 | int j; |
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| 274 | for (j = 0; j < n; j++) { |
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| 275 | ptr[j*8+0] = buf[j] >> 7; |
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| 276 | ptr[j*8+1] = (buf[j] >> 6) & 1; |
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| 277 | ptr[j*8+2] = (buf[j] >> 5) & 1; |
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| 278 | ptr[j*8+3] = (buf[j] >> 4) & 1; |
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| 279 | ptr[j*8+4] = (buf[j] >> 3) & 1; |
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| 280 | ptr[j*8+5] = (buf[j] >> 2) & 1; |
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| 281 | ptr[j*8+6] = (buf[j] >> 1) & 1; |
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| 282 | ptr[j*8+7] = buf[j] & 1; |
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| 283 | } |
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| 284 | buf += n; |
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| 285 | ptr += linesize; |
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| 286 | } |
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| 287 | break; |
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| 288 | case 8: |
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| 289 | case 24: |
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| 290 | case 32: |
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| 291 | for (i = 0; i < avctx->height; i++) { |
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| 292 | memcpy(ptr, buf, n); |
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| 293 | buf += n; |
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| 294 | ptr += linesize; |
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| 295 | } |
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| 296 | break; |
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| 297 | case 4: |
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| 298 | for (i = 0; i < avctx->height; i++) { |
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| 299 | int j; |
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| 300 | for (j = 0; j < n; j++) { |
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| 301 | ptr[j*2+0] = (buf[j] >> 4) & 0xF; |
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| 302 | ptr[j*2+1] = buf[j] & 0xF; |
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| 303 | } |
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| 304 | buf += n; |
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| 305 | ptr += linesize; |
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| 306 | } |
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| 307 | break; |
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| 308 | case 16: |
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| 309 | for (i = 0; i < avctx->height; i++) { |
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| 310 | const uint16_t *src = (const uint16_t *) buf; |
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| 311 | uint16_t *dst = (uint16_t *) ptr; |
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| 312 | |||
| 313 | for (j = 0; j < avctx->width; j++) |
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| 314 | *dst++ = av_le2ne16(*src++); |
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| 315 | |||
| 316 | buf += n; |
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| 317 | ptr += linesize; |
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| 318 | } |
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| 319 | break; |
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| 320 | default: |
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| 321 | av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n"); |
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| 322 | return AVERROR_INVALIDDATA; |
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| 323 | } |
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| 324 | } |
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| 325 | |||
| 326 | *got_frame = 1; |
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| 327 | |||
| 328 | return buf_size; |
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| 329 | } |
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| 330 | |||
| 331 | AVCodec ff_bmp_decoder = { |
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| 332 | .name = "bmp", |
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| 333 | .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"), |
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| 334 | .type = AVMEDIA_TYPE_VIDEO, |
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| 335 | .id = AV_CODEC_ID_BMP, |
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| 336 | .decode = bmp_decode_frame, |
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| 337 | .capabilities = CODEC_CAP_DR1, |
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| 338 | }; |