avcodec: add XBM encoder

Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/libavcodec/xbmenc.c b/libavcodec/xbmenc.c
new file mode 100644
index 0000000000..2df6ae0d77
--- /dev/null
+++ b/libavcodec/xbmenc.c
@@ -0,0 +1,86 @@
+/*
+ * XBM image format
+ *
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; 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_encode_init(AVCodecContext *avctx)
+{
+    avctx->coded_frame = avcodec_alloc_frame();
+    if (!avctx->coded_frame)
+        return AVERROR(ENOMEM);
+    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
+
+    return 0;
+}
+
+static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+                            const AVFrame *p, int *got_packet)
+{
+    int i, j, ret, size, linesize;
+    uint8_t *ptr, *buf;
+
+    linesize = (avctx->width + 7) / 8;
+    size     = avctx->height * (linesize * 7 + 2) + 110;
+    if ((ret = ff_alloc_packet(pkt, size)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
+        return ret;
+    }
+
+    buf = pkt->data;
+    ptr = p->data[0];
+
+    buf += snprintf(buf, 32, "#define image_width %u\n", avctx->width);
+    buf += snprintf(buf, 33, "#define image_height %u\n", avctx->height);
+    buf += snprintf(buf, 40, "static unsigned char image_bits[] = {\n");
+    for (i = 0; i < avctx->height; i++) {
+        for (j = 0; j < linesize; j++)
+            buf += snprintf(buf, 7, " 0x%02X,", av_reverse[*ptr++]);
+        ptr += p->linesize[0] - linesize;
+        buf += snprintf(buf, 2, "\n");
+    }
+    buf += snprintf(buf, 5, " };\n");
+
+    pkt->size   = buf - pkt->data;
+    pkt->flags |= AV_PKT_FLAG_KEY;
+    *got_packet = 1;
+    return 0;
+}
+
+static av_cold int xbm_encode_close(AVCodecContext *avctx)
+{
+    av_freep(&avctx->coded_frame);
+
+    return 0;
+}
+
+AVCodec ff_xbm_encoder = {
+    .name         = "xbm",
+    .type         = AVMEDIA_TYPE_VIDEO,
+    .id           = CODEC_ID_XBM,
+    .init         = xbm_encode_init,
+    .encode2      = xbm_encode_frame,
+    .close        = xbm_encode_close,
+    .pix_fmts     = (const enum PixelFormat[]) { PIX_FMT_MONOWHITE,
+                                                 PIX_FMT_NONE },
+    .long_name    = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
+};