yading@10: /*
yading@10:  * Dxtory decoder
yading@10:  *
yading@10:  * Copyright (c) 2011 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of Libav.
yading@10:  *
yading@10:  * Libav is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * Libav is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with Libav; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/intreadwrite.h"
yading@10: 
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     avctx->pix_fmt     = AV_PIX_FMT_YUV420P;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     int h, w;
yading@10:     AVFrame *pic = data;
yading@10:     const uint8_t *src = avpkt->data;
yading@10:     uint8_t *Y1, *Y2, *U, *V;
yading@10:     int ret;
yading@10: 
yading@10:     if (avpkt->size < avctx->width * avctx->height * 3 / 2 + 16) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "packet too small\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     pic->pict_type = AV_PICTURE_TYPE_I;
yading@10:     pic->key_frame = 1;
yading@10: 
yading@10:     if (AV_RL32(src) != 0x01000002) {
yading@10:         avpriv_request_sample(avctx, "Frame header %X", AV_RL32(src));
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10:     src += 16;
yading@10: 
yading@10:     Y1 = pic->data[0];
yading@10:     Y2 = pic->data[0] + pic->linesize[0];
yading@10:     U  = pic->data[1];
yading@10:     V  = pic->data[2];
yading@10:     for (h = 0; h < avctx->height; h += 2) {
yading@10:         for (w = 0; w < avctx->width; w += 2) {
yading@10:             AV_COPY16(Y1 + w, src);
yading@10:             AV_COPY16(Y2 + w, src + 2);
yading@10:             U[w >> 1] = src[4] + 0x80;
yading@10:             V[w >> 1] = src[5] + 0x80;
yading@10:             src += 6;
yading@10:         }
yading@10:         Y1 += pic->linesize[0] << 1;
yading@10:         Y2 += pic->linesize[0] << 1;
yading@10:         U  += pic->linesize[1];
yading@10:         V  += pic->linesize[2];
yading@10:     }
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_dxtory_decoder = {
yading@10:     .name           = "dxtory",
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Dxtory"),
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_DXTORY,
yading@10:     .init           = decode_init,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10: };