From 19341c58e0f7210046286e08ae5f955a14ee3e3f Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Fri, 9 Dec 2011 11:06:02 +0100 Subject: Dxtory capture format decoder Signed-off-by: Anton Khirnov --- libavcodec/dxtory.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 libavcodec/dxtory.c (limited to 'libavcodec/dxtory.c') diff --git a/libavcodec/dxtory.c b/libavcodec/dxtory.c new file mode 100644 index 0000000000..5f67fbdbef --- /dev/null +++ b/libavcodec/dxtory.c @@ -0,0 +1,109 @@ +/* + * 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, +}; -- cgit v1.2.3