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/*
* V210 decoder
*
* Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
*
* 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
*/
#include "avcodec.h"
#include "libavutil/bswap.h"
static av_cold int decode_init(AVCodecContext *avctx)
{
if (avctx->width & 1) {
av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
return -1;
}
if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0)
return -1;
avctx->pix_fmt = PIX_FMT_YUV422P16;
avctx->bits_per_raw_sample = 10;
avctx->coded_frame = avcodec_alloc_frame();
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 *psrc = avpkt->data;
uint16_t *y, *u, *v;
int aligned_width = ((avctx->width + 47) / 48) * 48;
int stride = aligned_width * 8 / 3;
if (pic->data[0])
avctx->release_buffer(avctx, pic);
if (avpkt->size < stride * avctx->height) {
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
return -1;
}
pic->reference = 0;
if (avctx->get_buffer(avctx, pic) < 0)
return -1;
y = (uint16_t*)pic->data[0];
u = (uint16_t*)pic->data[1];
v = (uint16_t*)pic->data[2];
pic->pict_type = FF_I_TYPE;
pic->key_frame = 1;
#define READ_PIXELS(a, b, c) \
do { \
val = le2me_32(*src++); \
*a++ = val << 6; \
*b++ = (val >> 4) & 0xFFC0; \
*c++ = (val >> 14) & 0xFFC0; \
} while (0)
for (h = 0; h < avctx->height; h++) {
const uint32_t *src = (const uint32_t*)psrc;
uint32_t val;
for (w = 0; w < avctx->width - 5; w += 6) {
READ_PIXELS(u, y, v);
READ_PIXELS(y, u, y);
READ_PIXELS(v, y, u);
READ_PIXELS(y, v, y);
}
if (w < avctx->width - 1) {
READ_PIXELS(u, y, v);
val = le2me_32(*src++);
*y++ = val << 6;
}
if (w < avctx->width - 3) {
*u++ = (val >> 4) & 0xFFC0;
*y++ = (val >> 14) & 0xFFC0;
val = le2me_32(*src++);
*v++ = val << 6;
*y++ = (val >> 4) & 0xFFC0;
}
psrc += stride;
y += pic->linesize[0] / 2 - avctx->width;
u += pic->linesize[1] / 2 - avctx->width / 2;
v += pic->linesize[2] / 2 - avctx->width / 2;
}
*data_size = sizeof(AVFrame);
*(AVFrame*)data = *avctx->coded_frame;
return avpkt->size;
}
static av_cold int decode_close(AVCodecContext *avctx)
{
av_freep(&avctx->coded_frame);
return 0;
}
AVCodec v210_decoder = {
"v210",
CODEC_TYPE_VIDEO,
CODEC_ID_V210,
0,
decode_init,
NULL,
decode_close,
decode_frame,
CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
};
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