libavcodec/xbmenc.c

   1 /*
   2  * XBM image format
   3  *
   4  * Copyright (c) 2012 Paul B Mahol
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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 av_cold int xbm_encode_init(AVCodecContext *avctx)
  28 {
  29     avctx->coded_frame = avcodec_alloc_frame();
  30     if (!avctx->coded_frame)
  31         return AVERROR(ENOMEM);
  32     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
  33
  34     return 0;
  35 }
  36
  37 static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  38                             const AVFrame *p, int *got_packet)
  39 {
  40     int i, j, ret, size, linesize;
  41     uint8_t *ptr, *buf;
  42
  43     linesize = (avctx->width + 7) / 8;
  44     size     = avctx->height * (linesize * 7 + 2) + 110;
  45     if ((ret = ff_alloc_packet(pkt, size)) < 0) {
  46         av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
  47         return ret;
  48     }
  49
  50     buf = pkt->data;
  51     ptr = p->data[0];
  52
  53     buf += snprintf(buf, 32, "#define image_width %u\n", avctx->width);
  54     buf += snprintf(buf, 33, "#define image_height %u\n", avctx->height);
  55     buf += snprintf(buf, 40, "static unsigned char image_bits[] = {\n");
  56     for (i = 0; i < avctx->height; i++) {
  57         for (j = 0; j < linesize; j++)
  58             buf += snprintf(buf, 7, " 0x%02X,", ff_reverse[*ptr++]);
  59         ptr += p->linesize[0] - linesize;
  60         buf += snprintf(buf, 2, "\n");
  61     }
  62     buf += snprintf(buf, 5, " };\n");
  63
  64     pkt->size   = buf - pkt->data;
  65     pkt->flags |= AV_PKT_FLAG_KEY;
  66     *got_packet = 1;
  67     return 0;
  68 }
  69
  70 static av_cold int xbm_encode_close(AVCodecContext *avctx)
  71 {
  72     av_freep(&avctx->coded_frame);
  73
  74     return 0;
  75 }
  76
  77 AVCodec ff_xbm_encoder = {
  78     .name         = "xbm",
  79     .type         = AVMEDIA_TYPE_VIDEO,
  80     .id           = AV_CODEC_ID_XBM,
  81     .init         = xbm_encode_init,
  82     .encode2      = xbm_encode_frame,
  83     .close        = xbm_encode_close,
  84     .pix_fmts     = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE,
  85                                                  AV_PIX_FMT_NONE },
  86     .long_name    = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
  87 };