Add decoder for "forward uncompressed".

Fixes issue 1467.

Originally committed as revision 20226 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 123 insertions, 0 deletions

diff --git a/libavcodec/frwu.c b/libavcodec/frwu.c
new file mode 100644
index 0000000000..28ed612df0
--- /dev/null
+++ b/libavcodec/frwu.c
@@ -0,0 +1,123 @@
+/*
+ * Forward Uncompressed
+ *
+ * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
+ *
+ * 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 "libavutil/intreadwrite.h"
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    if (avctx->width & 1) {
+        av_log(avctx, AV_LOG_ERROR, "FRWU needs even width\n");
+        return -1;
+    }
+    avctx->pix_fmt = PIX_FMT_UYVY422;
+
+    avctx->coded_frame = avcodec_alloc_frame();
+
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
+                        AVPacket *avpkt)
+{
+    int field;
+    AVFrame *pic = avctx->coded_frame;
+    const uint8_t *buf = avpkt->data;
+    const uint8_t *buf_end = buf + avpkt->size;
+
+    if (pic->data[0])
+        avctx->release_buffer(avctx, pic);
+
+    if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) {
+        av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n");
+        return -1;
+    }
+    if (bytestream_get_le32(&buf) != AV_RL32("FRW1")) {
+        av_log(avctx, AV_LOG_ERROR, "incorrect marker\n");
+        return -1;
+    }
+
+    pic->reference = 0;
+    if (avctx->get_buffer(avctx, pic) < 0)
+        return -1;
+
+    pic->pict_type = FF_I_TYPE;
+    pic->key_frame = 1;
+    pic->interlaced_frame = 1;
+    pic->top_field_first = 1;
+
+    for (field = 0; field < 2; field++) {
+        int i;
+        int field_h = (avctx->height + !field) >> 1;
+        int field_size, min_field_size = avctx->width * 2 * field_h;
+        uint8_t *dst = pic->data[0];
+        if (buf_end - buf < 8)
+            return -1;
+        buf += 4; // flags? 0x80 == bottom field maybe?
+        field_size = bytestream_get_le32(&buf);
+        if (field_size < min_field_size) {
+            av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size);
+            return -1;
+        }
+        if (buf_end - buf < field_size) {
+            av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf));
+            return -1;
+        }
+        if (field)
+            dst += pic->linesize[0];
+        for (i = 0; i < field_h; i++) {
+            memcpy(dst, buf, avctx->width * 2);
+            buf += avctx->width * 2;
+            dst += pic->linesize[0] << 1;
+        }
+        buf += field_size - min_field_size;
+    }
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = *pic;
+
+    return avpkt->size;
+}
+
+static av_cold int decode_close(AVCodecContext *avctx)
+{
+    AVFrame *pic = avctx->coded_frame;
+    if (pic->data[0])
+        avctx->release_buffer(avctx, pic);
+    av_freep(&avctx->coded_frame);
+
+    return 0;
+}
+
+AVCodec frwu_decoder = {
+    "FRWU",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_FRWU,
+    0,
+    decode_init,
+    NULL,
+    decode_close,
+    decode_frame,
+    CODEC_CAP_DR1,
+    .long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"),
+};