146 lines
4 KiB
C
Executable file
146 lines
4 KiB
C
Executable file
/*
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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 "libavutil/avstring.h"
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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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static int get_nibble(uint8_t x)
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{
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int ret = 255;
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if (x <= '9') {
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if (x >= '0')
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ret = x - '0';
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} else if (x >= 'a') {
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if (x <= 'f')
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ret = x - ('a' - 10);
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} else if (x >= 'A' && x <= 'F')
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ret = x - ('A' - 10);
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return ret;
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}
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static int parse_str_int(const uint8_t *p, const uint8_t *end, const uint8_t *key)
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{
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int keylen = strlen(key);
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const uint8_t *e = end - keylen;
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for(; p < e; p++) {
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if (!memcmp(p, key, keylen))
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break;
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}
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p += keylen;
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if (p >= end)
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return INT_MIN;
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for(; p<end; p++) {
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char *eptr;
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int64_t ret = strtol(p, &eptr, 10);
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if ((const uint8_t *)eptr != p)
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return ret;
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}
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return INT_MIN;
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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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int ret, linesize, i, j;
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int width = 0;
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int height = 0;
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const uint8_t *end, *ptr = avpkt->data;
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const uint8_t *next;
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uint8_t *dst;
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avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
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end = avpkt->data + avpkt->size;
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width = parse_str_int(avpkt->data, end, "_width");
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height = parse_str_int(avpkt->data, end, "_height");
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if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
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return ret;
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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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next = memchr(ptr, '{', avpkt->size);
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if (!next)
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next = memchr(ptr, '(', avpkt->size);
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if (!next)
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return AVERROR_INVALIDDATA;
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ptr = next + 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 nib, val;
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while (ptr < end && *ptr != 'x' && *ptr != '$')
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ptr++;
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ptr ++;
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if (ptr < end && (val = get_nibble(*ptr)) <= 15) {
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ptr++;
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if ((nib = get_nibble(*ptr)) <= 15) {
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val = (val << 4) + nib;
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ptr++;
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}
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*dst++ = ff_reverse[val];
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if ((val = get_nibble(*ptr)) <= 15 && j+1 < linesize) {
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j++;
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ptr++;
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if ((nib = get_nibble(*ptr)) <= 15) {
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val = (val << 4) + nib;
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ptr++;
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}
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*dst++ = ff_reverse[val];
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}
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} else {
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av_log(avctx, AV_LOG_ERROR,
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"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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.long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_XBM,
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.decode = xbm_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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