Dxtory capture format decoder

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 109 insertions, 0 deletions

diff --git a/libavcodec/dxtory.c b/libavcodec/dxtory.c
new file mode 100644
index 0000000000..5f67fbdbef
--- /dev/null
+++ b/libavcodec/dxtory.c
@@ -0,0 +1,109 @@
+/*
+ * Dxtory decoder
+ *
+ * Copyright (c) 2011 Konstantin Shishkov
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avcodec.h"
+#include "libavutil/intreadwrite.h"
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    avctx->pix_fmt     = PIX_FMT_YUV420P;
+    avctx->coded_frame = avcodec_alloc_frame();
+    if (!avctx->coded_frame)
+        return AVERROR(ENOMEM);
+
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
+                        AVPacket *avpkt)
+{
+    int h, w;
+    AVFrame *pic = avctx->coded_frame;
+    const uint8_t *src = avpkt->data;
+    uint8_t *Y1, *Y2, *U, *V;
+    int ret;
+
+    if (pic->data[0])
+        avctx->release_buffer(avctx, pic);
+
+    if (avpkt->size < avctx->width * avctx->height * 3 / 2 + 16) {
+        av_log(avctx, AV_LOG_ERROR, "packet too small\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    pic->reference = 0;
+    if ((ret = avctx->get_buffer(avctx, pic)) < 0)
+        return ret;
+
+    pic->pict_type = AV_PICTURE_TYPE_I;
+    pic->key_frame = 1;
+
+    if (AV_RL32(src) != 0x01000002) {
+        av_log_ask_for_sample(avctx, "Unknown frame header %X\n", AV_RL32(src));
+        return AVERROR_PATCHWELCOME;
+    }
+    src += 16;
+
+    Y1 = pic->data[0];
+    Y2 = pic->data[0] + pic->linesize[0];
+    U  = pic->data[1];
+    V  = pic->data[2];
+    for (h = 0; h < avctx->height; h += 2) {
+        for (w = 0; w < avctx->width; w += 2) {
+            AV_WN16A(Y1 + w, AV_RN16A(src));
+            AV_WN16A(Y2 + w, AV_RN16A(src + 2));
+            U[w >> 1] = src[4] + 0x80;
+            V[w >> 1] = src[5] + 0x80;
+            src += 6;
+        }
+        Y1 += pic->linesize[0] << 1;
+        Y2 += pic->linesize[0] << 1;
+        U  += pic->linesize[1];
+        V  += pic->linesize[2];
+    }
+
+    *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 ff_dxtory_decoder = {
+    .name           = "dxtory",
+    .long_name      = NULL_IF_CONFIG_SMALL("Dxtory"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = CODEC_ID_DXTORY,
+    .init           = decode_init,
+    .close          = decode_close,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+};