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authorDaniel Verkamp <daniel@drv.nu>2010-03-09 01:03:09 +0000
committerDaniel Verkamp <daniel@drv.nu>2010-03-09 01:03:09 +0000
commitbf3541220188c708dd618ca28f5b73fb2ecfa149 (patch)
tree55c16528a63b9b3cd4e11f1f543d401250fcd409
parent987e857f638bff63f11905d06466e198a9765f65 (diff)
downloadffmpeg-bf3541220188c708dd618ca28f5b73fb2ecfa149.tar.gz
Kega Game Video (KGV1) decoder
Originally committed as revision 22364 to svn://svn.ffmpeg.org/ffmpeg/trunk
-rw-r--r--Changelog1
-rw-r--r--doc/general.texi2
-rw-r--r--libavcodec/Makefile1
-rw-r--r--libavcodec/allcodecs.c1
-rw-r--r--libavcodec/avcodec.h1
-rw-r--r--libavcodec/kgv1dec.c176
-rw-r--r--libavformat/riff.c1
7 files changed, 183 insertions, 0 deletions
diff --git a/Changelog b/Changelog
index f1628f79ce..be4629375d 100644
--- a/Changelog
+++ b/Changelog
@@ -62,6 +62,7 @@ version <next>:
- AMR-NB decoder
- RTSP muxer
- HE-AAC v1 decoder
+- Kega Game Video (KGV1) decoder
diff --git a/doc/general.texi b/doc/general.texi
index 6fed6c3b8c..8f808e8958 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -403,6 +403,8 @@ following image formats are supported:
@tab Used in Interplay .MVE files.
@item Karl Morton's video codec @tab @tab X
@tab Codec used in Worms games.
+@item Kega Game Video (KGV1) @tab @tab X
+ @tab Kega emulator screen capture codec.
@item LCL (LossLess Codec Library) MSZH @tab @tab X
@item LCL (LossLess Codec Library) ZLIB @tab E @tab E
@item LOCO @tab @tab X
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 4796b58b4c..6356c113b8 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -167,6 +167,7 @@ OBJS-$(CONFIG_INTERPLAY_VIDEO_DECODER) += interplayvideo.o
OBJS-$(CONFIG_JPEGLS_DECODER) += jpeglsdec.o jpegls.o \
mjpegdec.o mjpeg.o
OBJS-$(CONFIG_JPEGLS_ENCODER) += jpeglsenc.o jpegls.o
+OBJS-$(CONFIG_KGV1_DECODER) += kgv1dec.o
OBJS-$(CONFIG_KMVC_DECODER) += kmvc.o
OBJS-$(CONFIG_LJPEG_ENCODER) += ljpegenc.o mjpegenc.o mjpeg.o \
mpegvideo_enc.o motion_est.o \
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index f0a93a2fdf..5dbf1dc363 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -122,6 +122,7 @@ void avcodec_register_all(void)
REGISTER_DECODER (INDEO5, indeo5);
REGISTER_DECODER (INTERPLAY_VIDEO, interplay_video);
REGISTER_ENCDEC (JPEGLS, jpegls);
+ REGISTER_DECODER (KGV1, kgv1);
REGISTER_DECODER (KMVC, kmvc);
REGISTER_ENCODER (LJPEG, ljpeg);
REGISTER_DECODER (LOCO, loco);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 3d162d7918..25eb2f0e30 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -206,6 +206,7 @@ enum CodecID {
CODEC_ID_BINKVIDEO,
CODEC_ID_IFF_ILBM,
CODEC_ID_IFF_BYTERUN1,
+ CODEC_ID_KGV1,
/* various PCM "codecs" */
CODEC_ID_PCM_S16LE= 0x10000,
diff --git a/libavcodec/kgv1dec.c b/libavcodec/kgv1dec.c
new file mode 100644
index 0000000000..d786578a95
--- /dev/null
+++ b/libavcodec/kgv1dec.c
@@ -0,0 +1,176 @@
+/*
+ * Kega Game Video (KGV1) decoder
+ * Copyright (c) 2010 Daniel Verkamp
+ *
+ * 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
+ */
+
+/**
+ * @file libavcodec/kgv1dec.c
+ * Kega Game Video decoder
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+
+typedef struct {
+ AVCodecContext *avctx;
+ AVFrame pic;
+ uint16_t *prev, *cur;
+} KgvContext;
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
+{
+ const uint8_t *buf = avpkt->data;
+ const uint8_t *buf_end = buf + avpkt->size;
+ KgvContext * const c = avctx->priv_data;
+ int offsets[7];
+ uint16_t *out, *prev;
+ int outcnt = 0, maxcnt;
+ int w, h, i;
+
+ if (avpkt->size < 2)
+ return -1;
+
+ w = (buf[0] + 1) * 8;
+ h = (buf[1] + 1) * 8;
+ buf += 2;
+
+ if (avcodec_check_dimensions(avctx, w, h))
+ return -1;
+
+ if (w != avctx->width || h != avctx->height)
+ avcodec_set_dimensions(avctx, w, h);
+
+ maxcnt = w * h;
+
+ out = av_realloc(c->cur, w * h * 2);
+ if (!out)
+ return -1;
+ c->cur = out;
+
+ prev = av_realloc(c->prev, w * h * 2);
+ if (!prev)
+ return -1;
+ c->prev = prev;
+
+ for (i = 0; i < 7; i++)
+ offsets[i] = -1;
+
+ while (outcnt < maxcnt && buf_end - 2 > buf) {
+ int code = AV_RL16(buf);
+ buf += 2;
+
+ if (!(code & 0x8000)) {
+ out[outcnt++] = code; // rgb555 pixel coded directly
+ } else {
+ int count;
+ uint16_t *inp;
+
+ if ((code & 0x6000) == 0x6000) {
+ // copy from previous frame
+ int oidx = (code >> 10) & 7;
+ int start;
+
+ count = (code & 0x3FF) + 3;
+
+ if (offsets[oidx] < 0) {
+ if (buf_end - 3 < buf)
+ break;
+ offsets[oidx] = AV_RL24(buf);
+ buf += 3;
+ }
+
+ start = (outcnt + offsets[oidx]) % maxcnt;
+
+ if (maxcnt - start < count)
+ break;
+
+ inp = prev + start;
+ } else {
+ // copy from earlier in this frame
+ int offset = (code & 0x1FFF) + 1;
+
+ if (!(code & 0x6000)) {
+ count = 2;
+ } else if ((code & 0x6000) == 0x2000) {
+ count = 3;
+ } else {
+ if (buf_end - 1 < buf)
+ break;
+ count = 4 + *buf++;
+ }
+
+ if (outcnt < offset)
+ break;
+
+ inp = out + outcnt - offset;
+ }
+
+ if (maxcnt - outcnt < count)
+ break;
+
+ for (i = 0; i < count; i++)
+ out[outcnt++] = inp[i];
+ }
+ }
+
+ if (outcnt - maxcnt)
+ av_log(avctx, AV_LOG_DEBUG, "frame finished with %d diff\n", outcnt - maxcnt);
+
+ c->pic.data[0] = (uint8_t *)c->cur;
+ c->pic.linesize[0] = w * 2;
+
+ *data_size = sizeof(AVFrame);
+ *(AVFrame*)data = c->pic;
+
+ FFSWAP(uint16_t *, c->cur, c->prev);
+
+ return avpkt->size;
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+ KgvContext * const c = avctx->priv_data;
+
+ c->avctx = avctx;
+ avctx->pix_fmt = PIX_FMT_RGB555;
+
+ return 0;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+ KgvContext * const c = avctx->priv_data;
+
+ av_freep(&c->cur);
+ av_freep(&c->prev);
+
+ return 0;
+}
+
+AVCodec kgv1_decoder = {
+ "kgv1",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_KGV1,
+ sizeof(KgvContext),
+ decode_init,
+ NULL,
+ decode_end,
+ decode_frame,
+ .long_name = NULL_IF_CONFIG_SMALL("Kega Game Video"),
+};
diff --git a/libavformat/riff.c b/libavformat/riff.c
index 0a3bc95062..f241421b80 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -240,6 +240,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
{ CODEC_ID_AURA, MKTAG('A', 'U', 'R', 'A') },
{ CODEC_ID_AURA2, MKTAG('A', 'U', 'R', '2') },
{ CODEC_ID_DPX, MKTAG('d', 'p', 'x', ' ') },
+ { CODEC_ID_KGV1, MKTAG('K', 'G', 'V', '1') },
{ CODEC_ID_NONE, 0 }
};