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-rw-r--r--libavcodec/y41pdec.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/libavcodec/y41pdec.c b/libavcodec/y41pdec.c
new file mode 100644
index 0000000000..9d1e5313e3
--- /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,
+};