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a247ac640d
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
147 lines
4.0 KiB
C
147 lines
4.0 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 "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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const 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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