20f9727018
Up until now, codec.h contains both public and private parts of AVCodec. This exposes the internals of AVCodec to users and leads them into the temptation of actually using them and forces us to forward-declare structures and types that users can't use at all. This commit changes this by adding a new structure FFCodec to codec_internal.h that extends AVCodec, i.e. contains the public AVCodec as first member; the private fields of AVCodec are moved to this structure, leaving codec.h clean. Reviewed-by: Anton Khirnov <anton@khirnov.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
148 lines
4.0 KiB
C
148 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 "codec_internal.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 FFCodec ff_xbm_decoder = {
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.p.name = "xbm",
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.p.long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_XBM,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.decode = xbm_decode_frame,
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};
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