FFmpeg/libavcodec/kgv1dec.c
Michael Niedermayer c581cb4e4f Merge remote-tracking branch 'qatar/master'
* qatar/master:
  Fix even more missing includes after the common.h removal
  build: Factor out rangecoder dependencies to CONFIG_RANGECODER
  build: Factor out error resilience dependencies to CONFIG_ERROR_RESILIENCE
  x86: avcodec: Consistently name all init files
  Add more missing includes after removing the implicit common.h
  Add some more missing includes after removing the implicit common.h
  Don't include common.h from avutil.h
  rtmp: Automatically compute the hash for SWFVerification

Conflicts:
	configure
	doc/APIchanges
	doc/examples/decoding_encoding.c
	libavcodec/Makefile
	libavcodec/assdec.c
	libavcodec/audio_frame_queue.c
	libavcodec/avpacket.c
	libavcodec/dv_profile.c
	libavcodec/dwt.c
	libavcodec/libtheoraenc.c
	libavcodec/rawdec.c
	libavcodec/rv40dsp.c
	libavcodec/tiff.c
	libavcodec/tiffenc.c
	libavcodec/v210dec.h
	libavcodec/vc1dsp.c
	libavcodec/x86/Makefile
	libavfilter/asrc_anullsrc.c
	libavfilter/avfilter.c
	libavfilter/buffer.c
	libavfilter/formats.c
	libavfilter/vf_ass.c
	libavfilter/vf_drawtext.c
	libavfilter/vf_fade.c
	libavfilter/vf_select.c
	libavfilter/video.c
	libavfilter/vsrc_testsrc.c
	libavformat/version.h
	libavutil/audioconvert.c
	libavutil/error.h
	libavutil/version.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-08-16 16:20:30 +02:00

195 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/common.h"
#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 = AV_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"),
};