mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-06 08:08:58 +02:00
![Michael Niedermayer](/assets/img/avatar_default.png)
* qatar/master: rtpdec_asf: Set the no_resync_search option for the chained asf demuxer asfdec: Add an option for not searching for the packet markers cosmetics: Clean up the tiffenc pix_fmts declaration to match the style of others cosmetics: Align codec declarations cosmetics: Convert mimic.c to utf-8 avconv: remove an unused function parameter. avconv: remove now pointless variables. avconv: drop support for building without libavfilter. nellymoserenc: fix crash due to memsetting the wrong area. libavformat: Only require first packet to be known for audio/video streams avplay: Don't try to scale timestamps if the tb isn't set Conflicts: Changelog configure ffmpeg.c libavcodec/aacenc.c libavcodec/bmpenc.c libavcodec/dnxhddec.c libavcodec/dnxhdenc.c libavcodec/ffv1.c libavcodec/flacenc.c libavcodec/fraps.c libavcodec/huffyuv.c libavcodec/libopenjpegdec.c libavcodec/mpeg12enc.c libavcodec/mpeg4videodec.c libavcodec/pamenc.c libavcodec/pgssubdec.c libavcodec/pngenc.c libavcodec/qtrleenc.c libavcodec/rawdec.c libavcodec/sgienc.c libavcodec/tiffenc.c libavcodec/v210dec.c libavcodec/wmv2dec.c libavformat/utils.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
194 lines
5.0 KiB
C
194 lines
5.0 KiB
C
/*
|
|
* 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
|
|
* Kega Game Video decoder
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/imgutils.h"
|
|
#include "avcodec.h"
|
|
|
|
typedef struct {
|
|
AVCodecContext *avctx;
|
|
AVFrame prev, cur;
|
|
} KgvContext;
|
|
|
|
static void decode_flush(AVCodecContext *avctx)
|
|
{
|
|
KgvContext * const c = avctx->priv_data;
|
|
|
|
if (c->prev.data[0])
|
|
avctx->release_buffer(avctx, &c->prev);
|
|
}
|
|
|
|
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[8];
|
|
uint16_t *out, *prev;
|
|
int outcnt = 0, maxcnt;
|
|
int w, h, i, res;
|
|
|
|
if (avpkt->size < 2)
|
|
return -1;
|
|
|
|
w = (buf[0] + 1) * 8;
|
|
h = (buf[1] + 1) * 8;
|
|
buf += 2;
|
|
|
|
if (av_image_check_size(w, h, 0, avctx))
|
|
return -1;
|
|
|
|
if (w != avctx->width || h != avctx->height) {
|
|
if (c->prev.data[0])
|
|
avctx->release_buffer(avctx, &c->prev);
|
|
avcodec_set_dimensions(avctx, w, h);
|
|
}
|
|
|
|
maxcnt = w * h;
|
|
|
|
c->cur.reference = 3;
|
|
if ((res = avctx->get_buffer(avctx, &c->cur)) < 0)
|
|
return res;
|
|
out = (uint16_t *) c->cur.data[0];
|
|
if (c->prev.data[0]) {
|
|
prev = (uint16_t *) c->prev.data[0];
|
|
} else {
|
|
prev = NULL;
|
|
}
|
|
|
|
for (i = 0; i < 8; 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;
|
|
int inp_off;
|
|
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;
|
|
|
|
if (!prev) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Frame reference does not exist\n");
|
|
break;
|
|
}
|
|
|
|
inp = prev;
|
|
inp_off = 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;
|
|
inp_off = outcnt - offset;
|
|
}
|
|
|
|
if (maxcnt - outcnt < count)
|
|
break;
|
|
|
|
for (i = inp_off; i < count + inp_off; i++) {
|
|
out[outcnt++] = inp[i];
|
|
}
|
|
}
|
|
}
|
|
|
|
if (outcnt - maxcnt)
|
|
av_log(avctx, AV_LOG_DEBUG, "frame finished with %d diff\n", outcnt - maxcnt);
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = c->cur;
|
|
|
|
if (c->prev.data[0])
|
|
avctx->release_buffer(avctx, &c->prev);
|
|
FFSWAP(AVFrame, 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;
|
|
avctx->flags |= CODEC_FLAG_EMU_EDGE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
decode_flush(avctx);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_kgv1_decoder = {
|
|
.name = "kgv1",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = CODEC_ID_KGV1,
|
|
.priv_data_size = sizeof(KgvContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
.decode = decode_frame,
|
|
.flush = decode_flush,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Kega Game Video"),
|
|
};
|