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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * PC Paintbrush PCX (.pcx) image decoder |
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| 3 | * Copyright (c) 2007, 2008 Ivo van Poorten |
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| 4 | * |
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| 5 | * This decoder does not support CGA palettes. I am unable to find samples |
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| 6 | * and Netpbm cannot generate them. |
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| 7 | * |
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| 8 | * This file is part of FFmpeg. |
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| 9 | * |
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| 10 | * FFmpeg is free software; you can redistribute it and/or |
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| 11 | * modify it under the terms of the GNU Lesser General Public |
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| 12 | * License as published by the Free Software Foundation; either |
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| 13 | * version 2.1 of the License, or (at your option) any later version. |
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| 14 | * |
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| 15 | * FFmpeg is distributed in the hope that it will be useful, |
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 18 | * Lesser General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU Lesser General Public |
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| 21 | * License along with FFmpeg; if not, write to the Free Software |
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| 22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 23 | */ |
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| 24 | |||
| 25 | #include "libavutil/imgutils.h" |
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| 26 | #include "avcodec.h" |
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| 27 | #include "bytestream.h" |
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| 28 | #include "get_bits.h" |
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| 29 | #include "internal.h" |
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| 30 | |||
| 31 | static void pcx_rle_decode(GetByteContext *gb, |
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| 32 | uint8_t *dst, |
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| 33 | unsigned int bytes_per_scanline, |
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| 34 | int compressed) |
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| 35 | { |
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| 36 | unsigned int i = 0; |
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| 37 | unsigned char run, value; |
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| 38 | |||
| 39 | if (compressed) { |
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| 40 | while (i < bytes_per_scanline && bytestream2_get_bytes_left(gb)>0) { |
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| 41 | run = 1; |
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| 42 | value = bytestream2_get_byte(gb); |
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| 43 | if (value >= 0xc0 && bytestream2_get_bytes_left(gb)>0) { |
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| 44 | run = value & 0x3f; |
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| 45 | value = bytestream2_get_byte(gb); |
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| 46 | } |
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| 47 | while (i < bytes_per_scanline && run--) |
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| 48 | dst[i++] = value; |
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| 49 | } |
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| 50 | } else { |
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| 51 | bytestream2_get_buffer(gb, dst, bytes_per_scanline); |
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| 52 | } |
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| 53 | } |
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| 54 | |||
| 55 | static void pcx_palette(GetByteContext *gb, uint32_t *dst, int pallen) |
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| 56 | { |
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| 57 | int i; |
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| 58 | |||
| 59 | pallen = FFMIN(pallen, bytestream2_get_bytes_left(gb) / 3); |
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| 60 | for (i = 0; i < pallen; i++) |
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| 61 | *dst++ = 0xFF000000 | bytestream2_get_be24u(gb); |
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| 62 | if (pallen < 256) |
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| 63 | memset(dst, 0, (256 - pallen) * sizeof(*dst)); |
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| 64 | } |
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| 65 | |||
| 66 | static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
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| 67 | AVPacket *avpkt) |
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| 68 | { |
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| 69 | GetByteContext gb; |
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| 70 | AVFrame * const p = data; |
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| 71 | int compressed, xmin, ymin, xmax, ymax; |
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| 72 | int ret; |
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| 73 | unsigned int w, h, bits_per_pixel, bytes_per_line, nplanes, stride, y, x, |
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| 74 | bytes_per_scanline; |
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| 75 | uint8_t *ptr, *scanline; |
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| 76 | |||
| 77 | if (avpkt->size < 128) |
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| 78 | return AVERROR_INVALIDDATA; |
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| 79 | |||
| 80 | bytestream2_init(&gb, avpkt->data, avpkt->size); |
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| 81 | |||
| 82 | if (bytestream2_get_byteu(&gb) != 0x0a || bytestream2_get_byteu(&gb) > 5) { |
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| 83 | av_log(avctx, AV_LOG_ERROR, "this is not PCX encoded data\n"); |
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| 84 | return AVERROR_INVALIDDATA; |
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| 85 | } |
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| 86 | |||
| 87 | compressed = bytestream2_get_byteu(&gb); |
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| 88 | bits_per_pixel = bytestream2_get_byteu(&gb); |
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| 89 | xmin = bytestream2_get_le16u(&gb); |
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| 90 | ymin = bytestream2_get_le16u(&gb); |
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| 91 | xmax = bytestream2_get_le16u(&gb); |
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| 92 | ymax = bytestream2_get_le16u(&gb); |
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| 93 | avctx->sample_aspect_ratio.num = bytestream2_get_le16u(&gb); |
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| 94 | avctx->sample_aspect_ratio.den = bytestream2_get_le16u(&gb); |
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| 95 | |||
| 96 | if (xmax < xmin || ymax < ymin) { |
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| 97 | av_log(avctx, AV_LOG_ERROR, "invalid image dimensions\n"); |
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| 98 | return AVERROR_INVALIDDATA; |
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| 99 | } |
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| 100 | |||
| 101 | w = xmax - xmin + 1; |
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| 102 | h = ymax - ymin + 1; |
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| 103 | |||
| 104 | bytestream2_skipu(&gb, 49); |
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| 105 | nplanes = bytestream2_get_byteu(&gb); |
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| 106 | bytes_per_line = bytestream2_get_le16u(&gb); |
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| 107 | bytes_per_scanline = nplanes * bytes_per_line; |
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| 108 | |||
| 109 | if (bytes_per_scanline < (w * bits_per_pixel * nplanes + 7) / 8 || |
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| 110 | (!compressed && bytes_per_scanline > bytestream2_get_bytes_left(&gb) / h)) { |
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| 111 | av_log(avctx, AV_LOG_ERROR, "PCX data is corrupted\n"); |
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| 112 | return AVERROR_INVALIDDATA; |
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| 113 | } |
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| 114 | |||
| 115 | switch ((nplanes << 8) + bits_per_pixel) { |
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| 116 | case 0x0308: |
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| 117 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
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| 118 | break; |
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| 119 | case 0x0108: |
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| 120 | case 0x0104: |
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| 121 | case 0x0102: |
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| 122 | case 0x0101: |
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| 123 | case 0x0401: |
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| 124 | case 0x0301: |
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| 125 | case 0x0201: |
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| 126 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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| 127 | break; |
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| 128 | default: |
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| 129 | av_log(avctx, AV_LOG_ERROR, "invalid PCX file\n"); |
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| 130 | return AVERROR_INVALIDDATA; |
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| 131 | } |
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| 132 | |||
| 133 | bytestream2_skipu(&gb, 60); |
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| 134 | |||
| 135 | if ((ret = av_image_check_size(w, h, 0, avctx)) < 0) |
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| 136 | return ret; |
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| 137 | if (w != avctx->width || h != avctx->height) |
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| 138 | avcodec_set_dimensions(avctx, w, h); |
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| 139 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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| 140 | return ret; |
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| 141 | |||
| 142 | p->pict_type = AV_PICTURE_TYPE_I; |
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| 143 | |||
| 144 | ptr = p->data[0]; |
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| 145 | stride = p->linesize[0]; |
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| 146 | |||
| 147 | scanline = av_malloc(bytes_per_scanline + FF_INPUT_BUFFER_PADDING_SIZE); |
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| 148 | if (!scanline) |
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| 149 | return AVERROR(ENOMEM); |
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| 150 | |||
| 151 | if (nplanes == 3 && bits_per_pixel == 8) { |
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| 152 | for (y = 0; y < h; y++) { |
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| 153 | pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed); |
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| 154 | |||
| 155 | for (x = 0; x < w; x++) { |
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| 156 | ptr[3 * x] = scanline[x]; |
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| 157 | ptr[3 * x + 1] = scanline[x + bytes_per_line]; |
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| 158 | ptr[3 * x + 2] = scanline[x + (bytes_per_line << 1)]; |
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| 159 | } |
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| 160 | |||
| 161 | ptr += stride; |
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| 162 | } |
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| 163 | } else if (nplanes == 1 && bits_per_pixel == 8) { |
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| 164 | int palstart = avpkt->size - 769; |
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| 165 | |||
| 166 | if (avpkt->size < 769) { |
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| 167 | av_log(avctx, AV_LOG_ERROR, "File is too short\n"); |
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| 168 | ret = avctx->err_recognition & AV_EF_EXPLODE ? |
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| 169 | AVERROR_INVALIDDATA : avpkt->size; |
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| 170 | goto end; |
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| 171 | } |
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| 172 | |||
| 173 | for (y = 0; y < h; y++, ptr += stride) { |
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| 174 | pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed); |
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| 175 | memcpy(ptr, scanline, w); |
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| 176 | } |
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| 177 | |||
| 178 | if (bytestream2_tell(&gb) != palstart) { |
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| 179 | av_log(avctx, AV_LOG_WARNING, "image data possibly corrupted\n"); |
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| 180 | bytestream2_seek(&gb, palstart, SEEK_SET); |
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| 181 | } |
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| 182 | if (bytestream2_get_byte(&gb) != 12) { |
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| 183 | av_log(avctx, AV_LOG_ERROR, "expected palette after image data\n"); |
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| 184 | ret = avctx->err_recognition & AV_EF_EXPLODE ? |
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| 185 | AVERROR_INVALIDDATA : avpkt->size; |
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| 186 | goto end; |
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| 187 | } |
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| 188 | } else if (nplanes == 1) { /* all packed formats, max. 16 colors */ |
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| 189 | GetBitContext s; |
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| 190 | |||
| 191 | for (y = 0; y < h; y++) { |
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| 192 | init_get_bits8(&s, scanline, bytes_per_scanline); |
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| 193 | |||
| 194 | pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed); |
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| 195 | |||
| 196 | for (x = 0; x < w; x++) |
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| 197 | ptr[x] = get_bits(&s, bits_per_pixel); |
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| 198 | ptr += stride; |
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| 199 | } |
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| 200 | } else { /* planar, 4, 8 or 16 colors */ |
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| 201 | int i; |
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| 202 | |||
| 203 | for (y = 0; y < h; y++) { |
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| 204 | pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed); |
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| 205 | |||
| 206 | for (x = 0; x < w; x++) { |
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| 207 | int m = 0x80 >> (x & 7), v = 0; |
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| 208 | for (i = nplanes - 1; i >= 0; i--) { |
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| 209 | v <<= 1; |
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| 210 | v += !!(scanline[i * bytes_per_line + (x >> 3)] & m); |
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| 211 | } |
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| 212 | ptr[x] = v; |
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| 213 | } |
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| 214 | ptr += stride; |
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| 215 | } |
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| 216 | } |
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| 217 | |||
| 218 | ret = bytestream2_tell(&gb); |
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| 219 | if (nplanes == 1 && bits_per_pixel == 8) { |
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| 220 | pcx_palette(&gb, (uint32_t *)p->data[1], 256); |
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| 221 | ret += 256 * 3; |
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| 222 | } else if (bits_per_pixel * nplanes == 1) { |
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| 223 | AV_WN32A(p->data[1] , 0xFF000000); |
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| 224 | AV_WN32A(p->data[1]+4, 0xFFFFFFFF); |
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| 225 | } else if (bits_per_pixel < 8) { |
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| 226 | bytestream2_seek(&gb, 16, SEEK_SET); |
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| 227 | pcx_palette(&gb, (uint32_t *)p->data[1], 16); |
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| 228 | } |
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| 229 | |||
| 230 | *got_frame = 1; |
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| 231 | |||
| 232 | end: |
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| 233 | av_free(scanline); |
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| 234 | return ret; |
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| 235 | } |
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| 236 | |||
| 237 | AVCodec ff_pcx_decoder = { |
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| 238 | .name = "pcx", |
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| 239 | .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"), |
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| 240 | .type = AVMEDIA_TYPE_VIDEO, |
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| 241 | .id = AV_CODEC_ID_PCX, |
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| 242 | .decode = pcx_decode_frame, |
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| 243 | .capabilities = CODEC_CAP_DR1, |
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| 244 | }; |