avcodec: WBMP (Wireless Application Protocol Bitmap) image format

Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: Peter Ross <pross@xvid.org>

1 files changed, 92 insertions, 0 deletions

diff --git a/libavcodec/wbmpdec.c b/libavcodec/wbmpdec.c
new file mode 100644
index 0000000000..0d0e574d9c
--- /dev/null
+++ b/libavcodec/wbmpdec.c
@@ -0,0 +1,92 @@
+/*
+ * WBMP (Wireless Application Protocol Bitmap) image
+ *
+ * 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 "bytestream.h"
+#include "codec_internal.h"
+#include "internal.h"
+#include "thread.h"
+
+static unsigned int getv(GetByteContext * gb)
+{
+    int i;
+    unsigned int v = 0;
+
+    do {
+        i = bytestream2_get_byte(gb);
+        v = (v << 7) | (i & 0x7F);
+    } while (i & 0x80);
+    return v;
+}
+
+static void readbits(uint8_t * dst, int width, int height, int linesize, const uint8_t * src, int size)
+{
+    int wpad = (width + 7) / 8;
+    for (int j = 0; j < height && size > 0; j++) {
+        memcpy(dst, src, FFMIN(wpad, size));
+        src += wpad;
+        size -= wpad;
+        dst += linesize;
+    }
+}
+
+static int wbmp_decode_frame(AVCodecContext *avctx, AVFrame *p,
+                            int *got_frame, AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size, width, height, ret;
+    GetByteContext gb;
+
+    bytestream2_init(&gb, buf, buf_size);
+
+    if (getv(&gb))
+        return AVERROR_INVALIDDATA;
+    bytestream2_skip(&gb, 1);
+    width = getv(&gb);
+    height = getv(&gb);
+
+    if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
+        return ret;
+
+    avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
+    if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
+        return ret;
+
+    if (p->linesize[0] == (width + 7) / 8)
+        bytestream2_get_buffer(&gb, p->data[0], height * ((width + 7) / 8));
+    else
+        readbits(p->data[0], width, height, p->linesize[0], gb.buffer, gb.buffer_end - gb.buffer_start);
+
+    p->key_frame = 1;
+    p->pict_type = AV_PICTURE_TYPE_I;
+
+    *got_frame   = 1;
+
+    return buf_size;
+}
+
+const FFCodec ff_wbmp_decoder = {
+    .p.name         = "wbmp",
+    .p.long_name    = NULL_IF_CONFIG_SMALL("WBMP (Wireless Application Protocol Bitmap) image"),
+    .p.type         = AVMEDIA_TYPE_VIDEO,
+    .p.id           = AV_CODEC_ID_WBMP,
+    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
+    FF_CODEC_DECODE_CB(wbmp_decode_frame),
+};