1 files changed, 84 insertions, 0 deletions
diff --git a/libavcodec/yuv4dec.c b/libavcodec/yuv4dec.c
new file mode 100644
index 0000000000..f89f62debe
--- /dev/null
+++ b/libavcodec/yuv4dec.c
@@ -0,0 +1,84 @@
+/*
+ * libquicktime yuv4 decoder
+ *
+ * Copyright (c) 2011 Carl Eugen Hoyos
+ *
+ * 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"
+
+static av_cold int yuv4_decode_init(AVCodecContext *avctx)
+{
+    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+
+    return 0;
+}
+
+static int yuv4_decode_frame(AVCodecContext *avctx, void *data,
+                             int *got_frame, AVPacket *avpkt)
+{
+    AVFrame *pic = data;
+    const uint8_t *src = avpkt->data;
+    uint8_t *y, *u, *v;
+    int i, j, ret;
+
+    if (avpkt->size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) {
+        av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
+        return AVERROR(EINVAL);
+    }
+
+    if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
+        return ret;
+
+    pic->key_frame = 1;
+    pic->pict_type = AV_PICTURE_TYPE_I;
+
+    y = pic->data[0];
+    u = pic->data[1];
+    v = pic->data[2];
+
+    for (i = 0; i < (avctx->height + 1) >> 1; i++) {
+        for (j = 0; j < (avctx->width + 1) >> 1; j++) {
+            u[j] = *src++ ^ 0x80;
+            v[j] = *src++ ^ 0x80;
+            y[                   2 * j    ] = *src++;
+            y[                   2 * j + 1] = *src++;
+            y[pic->linesize[0] + 2 * j    ] = *src++;
+            y[pic->linesize[0] + 2 * j + 1] = *src++;
+        }
+
+        y += 2 * pic->linesize[0];
+        u +=     pic->linesize[1];
+        v +=     pic->linesize[2];
+    }
+
+    *got_frame = 1;
+
+    return avpkt->size;
+}
+
+AVCodec ff_yuv4_decoder = {
+    .name         = "yuv4",
+    .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),
+    .type         = AVMEDIA_TYPE_VIDEO,
+    .id           = AV_CODEC_ID_YUV4,
+    .init         = yuv4_decode_init,
+    .decode       = yuv4_decode_frame,
+    .capabilities = AV_CODEC_CAP_DR1,
+};