FFmpeg/libavcodec/xbmdec.c

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/*
* XBM image format
*
* Copyright (c) 2012 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "internal.h"
static av_cold int xbm_decode_init(AVCodecContext *avctx)
{
avctx->coded_frame = avcodec_alloc_frame();
if (!avctx->coded_frame)
return AVERROR(ENOMEM);
return 0;
}
static int convert(uint8_t x)
{
if (x >= 'a')
x -= 87;
else if (x >= 'A')
x -= 55;
else
x -= '0';
return x;
}
static int xbm_decode_frame(AVCodecContext *avctx, void *data,
int *data_size, AVPacket *avpkt)
{
AVFrame *p = avctx->coded_frame;
const uint8_t *end, *ptr = avpkt->data;
uint8_t *dst;
int ret, linesize, i, j;
end = avpkt->data + avpkt->size;
while (!avctx->width || !avctx->height) {
char name[256];
int number, len;
ptr += strcspn(ptr, "#");
if (sscanf(ptr, "#define %256s %u", name, &number) != 2) {
av_log(avctx, AV_LOG_ERROR, "Unexpected preprocessor directive\n");
return AVERROR_INVALIDDATA;
}
len = strlen(name);
if ((len > 6) && !avctx->height && !memcmp(name + len - 7, "_height", 7)) {
avctx->height = number;
} else if ((len > 5) && !avctx->width && !memcmp(name + len - 6, "_width", 6)) {
avctx->width = number;
} else {
av_log(avctx, AV_LOG_ERROR, "Unknown define '%s'\n", name);
return AVERROR_INVALIDDATA;
}
ptr += strcspn(ptr, "\n\r") + 1;
}
avctx->pix_fmt = PIX_FMT_MONOWHITE;
if (p->data[0])
avctx->release_buffer(avctx, p);
p->reference = 0;
if ((ret = avctx->get_buffer(avctx, p)) < 0)
return ret;
// goto start of image data
ptr += strcspn(ptr, "{") + 1;
linesize = (avctx->width + 7) / 8;
for (i = 0; i < avctx->height; i++) {
dst = p->data[0] + i * p->linesize[0];
for (j = 0; j < linesize; j++) {
uint8_t val;
ptr += strcspn(ptr, "x") + 1;
if (ptr < end && isxdigit(*ptr)) {
val = convert(*ptr);
ptr++;
if (isxdigit(*ptr))
val = (val << 4) + convert(*ptr);
*dst++ = av_reverse[val];
} else {
av_log(avctx, AV_LOG_ERROR, "Unexpected data at '%.8s'\n", ptr);
return AVERROR_INVALIDDATA;
}
}
}
p->key_frame = 1;
p->pict_type = AV_PICTURE_TYPE_I;
*data_size = sizeof(AVFrame);
*(AVFrame *)data = *p;
return avpkt->size;
}
static av_cold int xbm_decode_close(AVCodecContext *avctx)
{
if (avctx->coded_frame->data[0])
avctx->release_buffer(avctx, avctx->coded_frame);
av_freep(&avctx->coded_frame);
return 0;
}
AVCodec ff_xbm_decoder = {
.name = "xbm",
.type = AVMEDIA_TYPE_VIDEO,
Merge commit '36ef5369ee9b336febc2c270f8718cec4476cb85' * commit '36ef5369ee9b336febc2c270f8718cec4476cb85': Replace all CODEC_ID_* with AV_CODEC_ID_* lavc: add AV prefix to codec ids. Conflicts: doc/APIchanges doc/examples/decoding_encoding.c doc/examples/muxing.c ffmpeg.c ffprobe.c ffserver.c libavcodec/8svx.c libavcodec/avcodec.h libavcodec/dnxhd_parser.c libavcodec/dvdsubdec.c libavcodec/error_resilience.c libavcodec/h263dec.c libavcodec/libvorbisenc.c libavcodec/mjpeg_parser.c libavcodec/mjpegenc.c libavcodec/mpeg12.c libavcodec/mpeg4videodec.c libavcodec/mpegvideo.c libavcodec/mpegvideo_enc.c libavcodec/pcm.c libavcodec/r210dec.c libavcodec/utils.c libavcodec/v210dec.c libavcodec/version.h libavdevice/alsa-audio-dec.c libavdevice/bktr.c libavdevice/v4l2.c libavformat/asfdec.c libavformat/asfenc.c libavformat/avformat.h libavformat/avidec.c libavformat/caf.c libavformat/electronicarts.c libavformat/flacdec.c libavformat/flvdec.c libavformat/flvenc.c libavformat/framecrcenc.c libavformat/img2.c libavformat/img2dec.c libavformat/img2enc.c libavformat/ipmovie.c libavformat/isom.c libavformat/matroska.c libavformat/matroskadec.c libavformat/matroskaenc.c libavformat/mov.c libavformat/movenc.c libavformat/mp3dec.c libavformat/mpeg.c libavformat/mpegts.c libavformat/mxf.c libavformat/mxfdec.c libavformat/mxfenc.c libavformat/nsvdec.c libavformat/nut.c libavformat/oggenc.c libavformat/pmpdec.c libavformat/rawdec.c libavformat/rawenc.c libavformat/riff.c libavformat/sdp.c libavformat/utils.c libavformat/vocenc.c libavformat/wtv.c libavformat/xmv.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-08-07 20:45:46 +00:00
.id = AV_CODEC_ID_XBM,
.init = xbm_decode_init,
.close = xbm_decode_close,
.decode = xbm_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
};