mirror of https://github.com/FFmpeg/FFmpeg.git
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/*
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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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