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  1. /*
  2.  * XBM image format
  3.  *
  4.  * Copyright (c) 2012 Paul B Mahol
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include "avcodec.h"
  24. #include "internal.h"
  25. #include "mathops.h"
  26.  
  27. static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  28.                             const AVFrame *p, int *got_packet)
  29. {
  30.     int i, j, ret, size, linesize;
  31.     uint8_t *ptr, *buf;
  32.  
  33.     linesize = (avctx->width + 7) / 8;
  34.     size     = avctx->height * (linesize * 7 + 2) + 110;
  35.     if ((ret = ff_alloc_packet2(avctx, pkt, size)) < 0)
  36.         return ret;
  37.  
  38.     buf = pkt->data;
  39.     ptr = p->data[0];
  40.  
  41.     buf += snprintf(buf, 32, "#define image_width %u\n", avctx->width);
  42.     buf += snprintf(buf, 33, "#define image_height %u\n", avctx->height);
  43.     buf += snprintf(buf, 40, "static unsigned char image_bits[] = {\n");
  44.     for (i = 0; i < avctx->height; i++) {
  45.         for (j = 0; j < linesize; j++)
  46.             buf += snprintf(buf, 7, " 0x%02X,", ff_reverse[*ptr++]);
  47.         ptr += p->linesize[0] - linesize;
  48.         buf += snprintf(buf, 2, "\n");
  49.     }
  50.     buf += snprintf(buf, 5, " };\n");
  51.  
  52.     pkt->size   = buf - pkt->data;
  53.     pkt->flags |= AV_PKT_FLAG_KEY;
  54.     *got_packet = 1;
  55.     return 0;
  56. }
  57.  
  58. AVCodec ff_xbm_encoder = {
  59.     .name         = "xbm",
  60.     .long_name    = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
  61.     .type         = AVMEDIA_TYPE_VIDEO,
  62.     .id           = AV_CODEC_ID_XBM,
  63.     .encode2      = xbm_encode_frame,
  64.     .pix_fmts     = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE,
  65.                                                    AV_PIX_FMT_NONE },
  66. };
  67.