mirror of
https://github.com/nyanmisaka/ffmpeg-rockchip.git
synced 2025-10-31 12:36:41 +08:00
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*
|
|
* Dxtory decoder
|
|
*
|
|
* Copyright (c) 2011 Konstantin Shishkov
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
avctx->pix_fmt = PIX_FMT_YUV420P;
|
|
avctx->coded_frame = avcodec_alloc_frame();
|
|
if (!avctx->coded_frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
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 *src = avpkt->data;
|
|
uint8_t *Y1, *Y2, *U, *V;
|
|
int ret;
|
|
|
|
if (pic->data[0])
|
|
avctx->release_buffer(avctx, pic);
|
|
|
|
if (avpkt->size < avctx->width * avctx->height * 3 / 2 + 16) {
|
|
av_log(avctx, AV_LOG_ERROR, "packet too small\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
pic->reference = 0;
|
|
if ((ret = avctx->get_buffer(avctx, pic)) < 0)
|
|
return ret;
|
|
|
|
pic->pict_type = AV_PICTURE_TYPE_I;
|
|
pic->key_frame = 1;
|
|
|
|
if (AV_RL32(src) != 0x01000002) {
|
|
av_log_ask_for_sample(avctx, "Unknown frame header %X\n", AV_RL32(src));
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
src += 16;
|
|
|
|
Y1 = pic->data[0];
|
|
Y2 = pic->data[0] + pic->linesize[0];
|
|
U = pic->data[1];
|
|
V = pic->data[2];
|
|
for (h = 0; h < avctx->height; h += 2) {
|
|
for (w = 0; w < avctx->width; w += 2) {
|
|
AV_WN16A(Y1 + w, AV_RN16A(src));
|
|
AV_WN16A(Y2 + w, AV_RN16A(src + 2));
|
|
U[w >> 1] = src[4] + 0x80;
|
|
V[w >> 1] = src[5] + 0x80;
|
|
src += 6;
|
|
}
|
|
Y1 += pic->linesize[0] << 1;
|
|
Y2 += pic->linesize[0] << 1;
|
|
U += pic->linesize[1];
|
|
V += pic->linesize[2];
|
|
}
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = *pic;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int decode_close(AVCodecContext *avctx)
|
|
{
|
|
AVFrame *pic = avctx->coded_frame;
|
|
if (pic->data[0])
|
|
avctx->release_buffer(avctx, pic);
|
|
av_freep(&avctx->coded_frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_dxtory_decoder = {
|
|
.name = "dxtory",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Dxtory"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = CODEC_ID_DXTORY,
|
|
.init = decode_init,
|
|
.close = decode_close,
|
|
.decode = decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
};
|