mirror of
https://github.com/librempeg/librempeg
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110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*
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* Dxtory decoder
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*
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* Copyright (c) 2011 Konstantin Shishkov
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "libavutil/intreadwrite.h"
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = PIX_FMT_YUV420P;
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avctx->coded_frame = avcodec_alloc_frame();
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if (!avctx->coded_frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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AVPacket *avpkt)
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{
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int h, w;
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AVFrame *pic = avctx->coded_frame;
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const uint8_t *src = avpkt->data;
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uint8_t *Y1, *Y2, *U, *V;
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int ret;
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if (pic->data[0])
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avctx->release_buffer(avctx, pic);
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if (avpkt->size < avctx->width * avctx->height * 3 / 2 + 16) {
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av_log(avctx, AV_LOG_ERROR, "packet too small\n");
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return AVERROR_INVALIDDATA;
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}
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pic->reference = 0;
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if ((ret = avctx->get_buffer(avctx, pic)) < 0)
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return ret;
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pic->pict_type = AV_PICTURE_TYPE_I;
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pic->key_frame = 1;
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if (AV_RL32(src) != 0x01000002) {
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av_log_ask_for_sample(avctx, "Unknown frame header %X\n", AV_RL32(src));
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return AVERROR_PATCHWELCOME;
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}
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src += 16;
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Y1 = pic->data[0];
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Y2 = pic->data[0] + pic->linesize[0];
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U = pic->data[1];
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V = pic->data[2];
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for (h = 0; h < avctx->height; h += 2) {
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for (w = 0; w < avctx->width; w += 2) {
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AV_WN16A(Y1 + w, AV_RN16A(src));
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AV_WN16A(Y2 + w, AV_RN16A(src + 2));
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U[w >> 1] = src[4] + 0x80;
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V[w >> 1] = src[5] + 0x80;
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src += 6;
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}
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Y1 += pic->linesize[0] << 1;
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Y2 += pic->linesize[0] << 1;
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U += pic->linesize[1];
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V += pic->linesize[2];
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = *pic;
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return avpkt->size;
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}
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static av_cold int decode_close(AVCodecContext *avctx)
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{
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AVFrame *pic = avctx->coded_frame;
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if (pic->data[0])
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avctx->release_buffer(avctx, pic);
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av_freep(&avctx->coded_frame);
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return 0;
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}
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AVCodec ff_dxtory_decoder = {
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.name = "dxtory",
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.long_name = NULL_IF_CONFIG_SMALL("Dxtory"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_DXTORY,
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.init = decode_init,
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.close = decode_close,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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