mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>pull/4/head
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1cd8510912
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a0340dfbd7
5 changed files with 134 additions and 3 deletions
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/*
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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 "avcodec.h" |
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#include "internal.h" |
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static av_cold int xbm_decode_init(AVCodecContext *avctx) |
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{ |
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avctx->coded_frame = avcodec_alloc_frame(); |
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if (!avctx->coded_frame) |
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return AVERROR(ENOMEM); |
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return 0; |
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} |
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static int convert(uint8_t x) |
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{ |
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if (x >= 'a') |
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x -= 87; |
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else if (x >= 'A') |
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x -= 55; |
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else |
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x -= '0'; |
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return x; |
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} |
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static int xbm_decode_frame(AVCodecContext *avctx, void *data, |
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int *data_size, AVPacket *avpkt) |
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{ |
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AVFrame *p = avctx->coded_frame; |
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const uint8_t *end, *ptr = avpkt->data; |
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uint8_t *dst; |
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int ret, linesize, i, j; |
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end = avpkt->data + avpkt->size; |
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while (!avctx->width || !avctx->height) { |
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char name[256]; |
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int number, len; |
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ptr += strcspn(ptr, "#"); |
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if (sscanf(ptr, "#define %256s %u", name, &number) != 2) |
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return AVERROR_INVALIDDATA; |
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len = strlen(name); |
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if ((len > 6) && !avctx->height && !memcmp(name + len - 7, "_height", 7)) { |
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avctx->height = number; |
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} else if ((len > 5) && !avctx->width && !memcmp(name + len - 6, "_width", 6)) { |
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avctx->width = number; |
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} else { |
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return AVERROR_INVALIDDATA; |
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} |
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ptr += strcspn(ptr, "\n\r") + 1; |
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} |
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avctx->pix_fmt = PIX_FMT_MONOWHITE; |
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if (p->data[0]) |
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avctx->release_buffer(avctx, p); |
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p->reference = 0; |
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if ((ret = avctx->get_buffer(avctx, p)) < 0) |
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return ret; |
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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 val; |
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ptr += strcspn(ptr, "x") + 1; |
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if (ptr < end && isxdigit(*ptr)) { |
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val = convert(*ptr); |
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ptr++; |
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if (isxdigit(*ptr)) |
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val = (val << 4) + convert(*ptr); |
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*dst++ = av_reverse[val]; |
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} else { |
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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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*data_size = sizeof(AVFrame); |
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*(AVFrame *)data = *p; |
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return avpkt->size; |
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} |
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static av_cold int xbm_decode_close(AVCodecContext *avctx) |
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{ |
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if (avctx->coded_frame->data[0]) |
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avctx->release_buffer(avctx, avctx->coded_frame); |
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av_freep(&avctx->coded_frame); |
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return 0; |
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} |
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AVCodec ff_xbm_decoder = { |
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.name = "xbm", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = CODEC_ID_XBM, |
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.init = xbm_decode_init, |
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.close = xbm_decode_close, |
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.decode = xbm_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"), |
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}; |
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