1 files changed, 92 insertions, 0 deletions
diff --git a/libavcodec/y41pdec.c b/libavcodec/y41pdec.c
new file mode 100644
index 0000000..9d1e531
--- /dev/null
+++ b/libavcodec/y41pdec.c
@@ -0,0 +1,92 @@
+/*
+ * y41p decoder
+ *
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * 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 y41p_decode_init(AVCodecContext *avctx)
+{
+    avctx->pix_fmt             = AV_PIX_FMT_YUV411P;
+    avctx->bits_per_raw_sample = 12;
+
+    if (avctx->width & 7) {
+        av_log(avctx, AV_LOG_WARNING, "y41p requires width to be divisible by 8.\n");
+    }
+
+    return 0;
+}
+
+static int y41p_decode_frame(AVCodecContext *avctx, void *data,
+                             int *got_frame, AVPacket *avpkt)
+{
+    AVFrame *pic = data;
+    uint8_t *src = avpkt->data;
+    uint8_t *y, *u, *v;
+    int i, j, ret;
+
+    if (avpkt->size < 1.5 * avctx->height * avctx->width) {
+        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;
+
+    for (i = avctx->height - 1; i >= 0 ; i--) {
+        y = &pic->data[0][i * pic->linesize[0]];
+        u = &pic->data[1][i * pic->linesize[1]];
+        v = &pic->data[2][i * pic->linesize[2]];
+        for (j = 0; j < avctx->width; j += 8) {
+            *(u++) = *src++;
+            *(y++) = *src++;
+            *(v++) = *src++;
+            *(y++) = *src++;
+
+            *(u++) = *src++;
+            *(y++) = *src++;
+            *(v++) = *src++;
+            *(y++) = *src++;
+
+            *(y++) = *src++;
+            *(y++) = *src++;
+            *(y++) = *src++;
+            *(y++) = *src++;
+        }
+    }
+
+    *got_frame = 1;
+
+    return avpkt->size;
+}
+
+AVCodec ff_y41p_decoder = {
+    .name         = "y41p",
+    .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed YUV 4:1:1 12-bit"),
+    .type         = AVMEDIA_TYPE_VIDEO,
+    .id           = AV_CODEC_ID_Y41P,
+    .init         = y41p_decode_init,
+    .decode       = y41p_decode_frame,
+    .capabilities = CODEC_CAP_DR1,
+};