| /* |
| * 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" |
| #include "mathops.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 *got_frame, 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 = AV_PIX_FMT_MONOWHITE; |
| |
| if (p->data[0]) |
| avctx->release_buffer(avctx, p); |
| |
| p->reference = 0; |
| if ((ret = ff_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++ = ff_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; |
| |
| *got_frame = 1; |
| *(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, |
| .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"), |
| }; |