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https://github.com/FFmpeg/FFmpeg.git
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120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/*
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* XBM image format
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*
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "internal.h"
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#include "mathops.h"
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#include "libavutil/avstring.h"
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static av_cold int xbm_decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
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return 0;
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}
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static int convert(uint8_t x)
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{
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if (x >= 'a')
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x -= 87;
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else if (x >= 'A')
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x -= 55;
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else
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x -= '0';
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return x;
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}
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static int xbm_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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AVFrame *p = data;
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const uint8_t *end, *ptr = avpkt->data;
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uint8_t *dst;
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int ret, linesize, i, j;
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end = avpkt->data + avpkt->size;
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while (!avctx->width || !avctx->height) {
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char name[256];
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int number, len;
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ptr += strcspn(ptr, "#");
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if (sscanf(ptr, "#define %256s %u", name, &number) != 2) {
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av_log(avctx, AV_LOG_ERROR, "Unexpected preprocessor directive\n");
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return AVERROR_INVALIDDATA;
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}
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len = strlen(name);
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if ((len > 6) && !avctx->height && !memcmp(name + len - 7, "_height", 7)) {
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avctx->height = number;
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} else if ((len > 5) && !avctx->width && !memcmp(name + len - 6, "_width", 6)) {
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avctx->width = number;
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} else {
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av_log(avctx, AV_LOG_ERROR, "Unknown define '%s'\n", name);
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return AVERROR_INVALIDDATA;
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}
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ptr += strcspn(ptr, "\n\r") + 1;
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}
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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// goto start of image data
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ptr += strcspn(ptr, "{") + 1;
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linesize = (avctx->width + 7) / 8;
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for (i = 0; i < avctx->height; i++) {
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dst = p->data[0] + i * p->linesize[0];
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for (j = 0; j < linesize; j++) {
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uint8_t val;
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ptr += strcspn(ptr, "x") + 1;
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if (ptr < end && av_isxdigit(*ptr)) {
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val = convert(*ptr);
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ptr++;
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if (av_isxdigit(*ptr))
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val = (val << 4) + convert(*ptr);
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*dst++ = ff_reverse[val];
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} else {
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av_log(avctx, AV_LOG_ERROR, "Unexpected data at '%.8s'\n", ptr);
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return AVERROR_INVALIDDATA;
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}
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}
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}
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p->key_frame = 1;
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p->pict_type = AV_PICTURE_TYPE_I;
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*got_frame = 1;
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return avpkt->size;
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}
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AVCodec ff_xbm_decoder = {
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.name = "xbm",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_XBM,
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.init = xbm_decode_init,
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.decode = xbm_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
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};
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