yuv4 libquicktime packed 4:2:0 encoder and decoder.

Reviewed-by: Derek Buitenhuis
Reviewed-by: Paul B Mahol

1 files changed, 93 insertions, 0 deletions

diff --git a/libavcodec/yuv4enc.c b/libavcodec/yuv4enc.c
new file mode 100644
index 0000000000..f15b7e82de
--- /dev/null
+++ b/libavcodec/yuv4enc.c
@@ -0,0 +1,93 @@
+/*
+ * libquicktime yuv4 encoder
+ *
+ * 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"
+
+static av_cold int yuv4_encode_init(AVCodecContext *avctx)
+{
+    avctx->coded_frame = avcodec_alloc_frame();
+
+    if (!avctx->coded_frame) {
+        av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
+        return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static int yuv4_encode_frame(AVCodecContext *avctx, uint8_t *buf,
+                             int buf_size, void *data)
+{
+    AVFrame *pic = data;
+    uint8_t *dst = buf;
+    uint8_t *y, *u, *v;
+    int i, j;
+    int output_size = 0;
+
+    if (buf_size < 6 * (avctx->width + 1 >> 1) * (avctx->height + 1 >> 1)) {
+        av_log(avctx, AV_LOG_ERROR, "Out buffer is too small.\n");
+        return AVERROR(ENOMEM);
+    }
+
+    avctx->coded_frame->reference = 0;
+    avctx->coded_frame->key_frame = 1;
+    avctx->coded_frame->pict_type = FF_I_TYPE;
+
+    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++) {
+            *dst++ = u[j] ^ 0x80;
+            *dst++ = v[j] ^ 0x80;
+            *dst++ = y[                   2 * j    ];
+            *dst++ = y[                   2 * j + 1];
+            *dst++ = y[pic->linesize[0] + 2 * j    ];
+            *dst++ = y[pic->linesize[0] + 2 * j + 1];
+            output_size += 6;
+        }
+        y += 2 * pic->linesize[0];
+        u +=     pic->linesize[1];
+        v +=     pic->linesize[2];
+    }
+
+    return output_size;
+}
+
+static av_cold int yuv4_encode_close(AVCodecContext *avctx)
+{
+    av_freep(&avctx->coded_frame);
+
+    return 0;
+}
+
+AVCodec ff_yuv4_encoder = {
+    .name         = "yuv4",
+    .type         = AVMEDIA_TYPE_VIDEO,
+    .id           = CODEC_ID_YUV4,
+    .init         = yuv4_encode_init,
+    .encode       = yuv4_encode_frame,
+    .close        = yuv4_encode_close,
+    .pix_fmts     = (const enum PixelFormat[]){ PIX_FMT_YUV420P, PIX_FMT_NONE },
+    .long_name    = NULL_IF_CONFIG_SMALL("Uncompressed packed 4:2:0"),
+};