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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * XBM image format |
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| 3 | * |
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| 4 | * Copyright (c) 2012 Paul B Mahol |
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| 5 | * |
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| 6 | * This file is part of FFmpeg. |
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| 7 | * |
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| 8 | * FFmpeg is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU Lesser General Public |
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| 10 | * License as published by the Free Software Foundation; either |
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| 11 | * version 2.1 of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * FFmpeg is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * Lesser General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public |
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| 19 | * License along with FFmpeg; if not, write to the Free Software |
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| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |||
| 23 | #include "avcodec.h" |
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| 24 | #include "internal.h" |
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| 25 | #include "mathops.h" |
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| 26 | #include "libavutil/avstring.h" |
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| 27 | |||
| 28 | static av_cold int xbm_decode_init(AVCodecContext *avctx) |
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| 29 | { |
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| 30 | avctx->pix_fmt = AV_PIX_FMT_MONOWHITE; |
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| 31 | |||
| 32 | return 0; |
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| 33 | } |
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| 34 | |||
| 35 | static int convert(uint8_t x) |
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| 36 | { |
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| 37 | if (x >= 'a') |
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| 38 | x -= 87; |
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| 39 | else if (x >= 'A') |
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| 40 | x -= 55; |
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| 41 | else |
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| 42 | x -= '0'; |
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| 43 | return x; |
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| 44 | } |
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| 45 | |||
| 46 | static int xbm_decode_frame(AVCodecContext *avctx, void *data, |
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| 47 | int *got_frame, AVPacket *avpkt) |
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| 48 | { |
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| 49 | AVFrame *p = data; |
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| 50 | const uint8_t *end, *ptr = avpkt->data; |
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| 51 | uint8_t *dst; |
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| 52 | int ret, linesize, i, j; |
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| 53 | |||
| 54 | end = avpkt->data + avpkt->size; |
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| 55 | while (!avctx->width || !avctx->height) { |
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| 56 | char name[256]; |
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| 57 | int number, len; |
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| 58 | |||
| 59 | ptr += strcspn(ptr, "#"); |
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| 60 | if (sscanf(ptr, "#define %255s %u", name, &number) != 2) { |
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| 61 | av_log(avctx, AV_LOG_ERROR, "Unexpected preprocessor directive\n"); |
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| 62 | return AVERROR_INVALIDDATA; |
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| 63 | } |
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| 64 | |||
| 65 | len = strlen(name); |
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| 66 | if ((len > 6) && !avctx->height && !memcmp(name + len - 7, "_height", 7)) { |
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| 67 | avctx->height = number; |
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| 68 | } else if ((len > 5) && !avctx->width && !memcmp(name + len - 6, "_width", 6)) { |
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| 69 | avctx->width = number; |
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| 70 | } else { |
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| 71 | av_log(avctx, AV_LOG_ERROR, "Unknown define '%s'\n", name); |
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| 72 | return AVERROR_INVALIDDATA; |
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| 73 | } |
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| 74 | ptr += strcspn(ptr, "\n\r") + 1; |
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| 75 | } |
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| 76 | |||
| 77 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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| 78 | return ret; |
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| 79 | |||
| 80 | // goto start of image data |
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| 81 | ptr += strcspn(ptr, "{") + 1; |
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| 82 | |||
| 83 | linesize = (avctx->width + 7) / 8; |
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| 84 | for (i = 0; i < avctx->height; i++) { |
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| 85 | dst = p->data[0] + i * p->linesize[0]; |
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| 86 | for (j = 0; j < linesize; j++) { |
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| 87 | uint8_t val; |
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| 88 | |||
| 89 | ptr += strcspn(ptr, "x") + 1; |
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| 90 | if (ptr < end && av_isxdigit(*ptr)) { |
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| 91 | val = convert(*ptr); |
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| 92 | ptr++; |
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| 93 | if (av_isxdigit(*ptr)) |
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| 94 | val = (val << 4) + convert(*ptr); |
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| 95 | *dst++ = ff_reverse[val]; |
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| 96 | } else { |
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| 97 | av_log(avctx, AV_LOG_ERROR, "Unexpected data at '%.8s'\n", ptr); |
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| 98 | return AVERROR_INVALIDDATA; |
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| 99 | } |
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| 100 | } |
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| 101 | } |
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| 102 | |||
| 103 | p->key_frame = 1; |
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| 104 | p->pict_type = AV_PICTURE_TYPE_I; |
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| 105 | |||
| 106 | *got_frame = 1; |
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| 107 | |||
| 108 | return avpkt->size; |
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| 109 | } |
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| 110 | |||
| 111 | AVCodec ff_xbm_decoder = { |
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| 112 | .name = "xbm", |
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| 113 | .long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"), |
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| 114 | .type = AVMEDIA_TYPE_VIDEO, |
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| 115 | .id = AV_CODEC_ID_XBM, |
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| 116 | .init = xbm_decode_init, |
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| 117 | .decode = xbm_decode_frame, |
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| 118 | .capabilities = CODEC_CAP_DR1, |
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| 119 | }; |