Dxtory capture format decoder

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

Changelog

@@ -106,6 +106,7 @@ easier to use. The changes are:
 - Playstation Portable PMP format demuxer
 - PCM format support in OMA demuxer
 - CLJR encoder
+- Dxtory capture format decoder
 
 
 version 0.7:

doc/general.texi

@@ -452,6 +452,7 @@ following image formats are supported:
 @item Duck TrueMotion 2.0    @tab     @tab  X
     @tab fourcc: TM20
 @item DV (Digital Video)     @tab  X  @tab  X
+@item Dxtory capture format  @tab     @tab  X
 @item Feeble Files/ScummVM DXA  @tab     @tab  X
     @tab Codec originally used in Feeble Files game.
 @item Electronic Arts CMV video  @tab     @tab  X

libavcodec/Makefile

@@ -125,6 +125,7 @@ OBJS-$(CONFIG_DVDSUB_ENCODER)          += dvdsubenc.o
 OBJS-$(CONFIG_DVVIDEO_DECODER)         += dv.o dvdata.o
 OBJS-$(CONFIG_DVVIDEO_ENCODER)         += dv.o dvdata.o
 OBJS-$(CONFIG_DXA_DECODER)             += dxa.o
+OBJS-$(CONFIG_DXTORY_DECODER)          += dxtory.o
 OBJS-$(CONFIG_EAC3_DECODER)            += eac3dec.o eac3_data.o
 OBJS-$(CONFIG_EAC3_ENCODER)            += eac3enc.o ac3enc.o ac3enc_float.o \
                                           ac3tab.o ac3.o kbdwin.o eac3_data.o

libavcodec/allcodecs.c

@@ -96,6 +96,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (DSICINVIDEO, dsicinvideo);
     REGISTER_ENCDEC  (DVVIDEO, dvvideo);
     REGISTER_DECODER (DXA, dxa);
+    REGISTER_DECODER (DXTORY, dxtory);
     REGISTER_DECODER (EACMV, eacmv);
     REGISTER_DECODER (EAMAD, eamad);
     REGISTER_DECODER (EATGQ, eatgq);

libavcodec/avcodec.h

@@ -252,6 +252,7 @@ enum CodecID {
     CODEC_ID_UTVIDEO,
     CODEC_ID_BMV_VIDEO,
     CODEC_ID_VBLE,
+    CODEC_ID_DXTORY,
 
     /* various PCM "codecs" */
     CODEC_ID_FIRST_AUDIO = 0x10000,     ///< A dummy id pointing at the start of audio codecs

libavcodec/dxtory.c

+/*
+ * 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,
+};

libavformat/riff.c

@@ -280,6 +280,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
     { CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'Y', '0') },
     { CODEC_ID_UTVIDEO,      MKTAG('U', 'L', 'Y', '2') },
     { CODEC_ID_VBLE,         MKTAG('V', 'B', 'L', 'E') },
+    { CODEC_ID_DXTORY,       MKTAG('x', 't', 'o', 'r') },
     { CODEC_ID_NONE,         0 }
 };