mirror of
https://github.com/FFmpeg/FFmpeg.git
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123 lines
3.8 KiB
C
123 lines
3.8 KiB
C
/*
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* XBM image format
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 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;
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int width = 0;
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int height = 0;
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const uint8_t *ptr = avpkt->data;
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uint8_t *dst;
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avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
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while (!width || !height) {
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ptr += strcspn(ptr, "#");
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if (ptr >= avpkt->data + avpkt->size) {
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av_log(avctx, AV_LOG_ERROR, "End of file reached.\n");
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return AVERROR_INVALIDDATA;
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}
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if (strncmp(ptr, "#define", 7) != 0) {
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av_log(avctx, AV_LOG_ERROR,
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"Unexpected preprocessor directive.\n");
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return AVERROR_INVALIDDATA;
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}
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// skip the name
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ptr += strcspn(ptr, "_") + 1;
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// get width or height
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if (strncmp(ptr, "width", 5) == 0) {
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ptr += strcspn(ptr, " ");
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width = strtol(ptr, NULL, 10);
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} else if (strncmp(ptr, "height", 6) == 0) {
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ptr += strcspn(ptr, " ");
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height = strtol(ptr, NULL, 10);
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} else {
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// skip offset and unknown variables
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av_log(avctx, AV_LOG_VERBOSE,
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"Ignoring preprocessor directive.\n");
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}
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}
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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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// go to start of image data
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ptr += strcspn(ptr, "{");
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linesize = (avctx->width + 7) / 8;
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for (i = 0; i < avctx->height; i++) {
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int eol = 0, e = 0;
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dst = p->data[0] + i * p->linesize[0];
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if (ptr >= avpkt->data + avpkt->size) {
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av_log(avctx, AV_LOG_ERROR, "End of file reached.\n");
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return AVERROR_INVALIDDATA;
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}
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do {
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int val;
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uint8_t *endptr;
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ptr += strcspn(ptr, "x") - 1; // -1 to get 0x
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val = strtol(ptr, (char **)&endptr, 16);
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if (endptr - ptr == 4) {
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// XBM X11 format
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*dst++ = ff_reverse[val];
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eol = linesize;
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} else if (endptr - ptr == 6) {
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// XBM X10 format
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*dst++ = ff_reverse[val >> 8];
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*dst++ = ff_reverse[val & 0xFF];
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eol = linesize / 2; // 2 bytes read
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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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ptr = endptr;
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} while (++e < eol);
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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 = CODEC_CAP_DR1,
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};
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