FFmpeg/libavcodec/aura.c
Michael Niedermayer ee77140afa Merge commit 'b2bed9325dbd6be0da1d91ffed3f513c40274fd2'
* commit 'b2bed9325dbd6be0da1d91ffed3f513c40274fd2':
  cosmetics: Group .name and .long_name together in codec/format declarations

Conflicts:
	libavcodec/8svx.c
	libavcodec/alac.c
	libavcodec/cljr.c
	libavcodec/dnxhddec.c
	libavcodec/dnxhdenc.c
	libavcodec/dpxenc.c
	libavcodec/dvdec.c
	libavcodec/dvdsubdec.c
	libavcodec/dvdsubenc.c
	libavcodec/ffv1dec.c
	libavcodec/flacdec.c
	libavcodec/flvdec.c
	libavcodec/fraps.c
	libavcodec/frwu.c
	libavcodec/g726.c
	libavcodec/gif.c
	libavcodec/gifdec.c
	libavcodec/h261dec.c
	libavcodec/h263dec.c
	libavcodec/iff.c
	libavcodec/imc.c
	libavcodec/libopencore-amr.c
	libavcodec/libopenjpegdec.c
	libavcodec/libopenjpegenc.c
	libavcodec/libspeexenc.c
	libavcodec/libvo-amrwbenc.c
	libavcodec/libvorbisenc.c
	libavcodec/libvpxenc.c
	libavcodec/libx264.c
	libavcodec/libxavs.c
	libavcodec/libxvid.c
	libavcodec/ljpegenc.c
	libavcodec/mjpegbdec.c
	libavcodec/mjpegdec.c
	libavcodec/mpeg12dec.c
	libavcodec/mpeg4videodec.c
	libavcodec/msmpeg4dec.c
	libavcodec/pgssubdec.c
	libavcodec/pngdec.c
	libavcodec/pngenc.c
	libavcodec/proresdec_lgpl.c
	libavcodec/proresenc_kostya.c
	libavcodec/ra144enc.c
	libavcodec/rawdec.c
	libavcodec/rv10.c
	libavcodec/sp5xdec.c
	libavcodec/takdec.c
	libavcodec/tta.c
	libavcodec/v210dec.c
	libavcodec/vp6.c
	libavcodec/wavpack.c
	libavcodec/xbmenc.c
	libavcodec/yop.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-10-04 12:34:23 +02:00

109 lines
3.2 KiB
C

/*
* Aura 2 decoder
*
* 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
* Aura 2 decoder
*/
#include "avcodec.h"
#include "internal.h"
#include "libavutil/internal.h"
static av_cold int aura_decode_init(AVCodecContext *avctx)
{
/* width needs to be divisible by 4 for this codec to work */
if (avctx->width & 0x3)
return AVERROR(EINVAL);
avctx->pix_fmt = AV_PIX_FMT_YUV422P;
return 0;
}
static int aura_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *pkt)
{
AVFrame *frame = data;
uint8_t *Y, *U, *V;
uint8_t val;
int x, y, ret;
const uint8_t *buf = pkt->data;
/* prediction error tables (make it clear that they are signed values) */
const int8_t *delta_table = (const int8_t*)buf + 16;
if (pkt->size != 48 + avctx->height * avctx->width) {
av_log(avctx, AV_LOG_ERROR, "got a buffer with %d bytes when %d were expected\n",
pkt->size, 48 + avctx->height * avctx->width);
return AVERROR_INVALIDDATA;
}
/* pixel data starts 48 bytes in, after 3x16-byte tables */
buf += 48;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
Y = frame->data[0];
U = frame->data[1];
V = frame->data[2];
/* iterate through each line in the height */
for (y = 0; y < avctx->height; y++) {
/* reset predictors */
val = *buf++;
U[0] = val & 0xF0;
Y[0] = val << 4;
val = *buf++;
V[0] = val & 0xF0;
Y[1] = Y[0] + delta_table[val & 0xF];
Y += 2; U++; V++;
/* iterate through the remaining pixel groups (4 pixels/group) */
for (x = 1; x < (avctx->width >> 1); x++) {
val = *buf++;
U[0] = U[-1] + delta_table[val >> 4];
Y[0] = Y[-1] + delta_table[val & 0xF];
val = *buf++;
V[0] = V[-1] + delta_table[val >> 4];
Y[1] = Y[ 0] + delta_table[val & 0xF];
Y += 2; U++; V++;
}
Y += frame->linesize[0] - avctx->width;
U += frame->linesize[1] - (avctx->width >> 1);
V += frame->linesize[2] - (avctx->width >> 1);
}
*got_frame = 1;
return pkt->size;
}
AVCodec ff_aura2_decoder = {
.name = "aura2",
.long_name = NULL_IF_CONFIG_SMALL("Auravision Aura 2"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_AURA2,
.init = aura_decode_init,
.decode = aura_decode_frame,
.capabilities = CODEC_CAP_DR1,
};