/* * Forward Uncompressed * * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de> * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avcodec.h" #include "bytestream.h" #include "internal.h" #include "libavutil/opt.h" typedef struct { AVClass *av_class; int change_field_order; } FRWUContext; static av_cold int decode_init(AVCodecContext *avctx) { if (avctx->width & 1) { av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n"); return AVERROR(EINVAL); } avctx->pix_fmt = AV_PIX_FMT_UYVY422; return 0; } static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { FRWUContext *s = avctx->priv_data; int field, ret; AVFrame *pic = data; const uint8_t *buf = avpkt->data; const uint8_t *buf_end = buf + avpkt->size; if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) { av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n"); return AVERROR_INVALIDDATA; } if (bytestream_get_le32(&buf) != MKTAG('F', 'R', 'W', '1')) { av_log(avctx, AV_LOG_ERROR, "incorrect marker\n"); return AVERROR_INVALIDDATA; } if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) return ret; pic->pict_type = AV_PICTURE_TYPE_I; pic->key_frame = 1; for (field = 0; field < 2; field++) { int i; int field_h = (avctx->height + !field) >> 1; int field_size, min_field_size = avctx->width * 2 * field_h; uint8_t *dst = pic->data[0]; if (buf_end - buf < 8) return AVERROR_INVALIDDATA; buf += 4; // flags? 0x80 == bottom field maybe? field_size = bytestream_get_le32(&buf); if (field_size < min_field_size) { av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size); return AVERROR_INVALIDDATA; } if (buf_end - buf < field_size) { av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf)); return AVERROR_INVALIDDATA; } if (field ^ s->change_field_order) { dst += pic->linesize[0]; } else if (s->change_field_order) { dst += 2 * pic->linesize[0]; } for (i = 0; i < field_h; i++) { if (s->change_field_order && field && i == field_h - 1) dst = pic->data[0]; memcpy(dst, buf, avctx->width * 2); buf += avctx->width * 2; dst += pic->linesize[0] << 1; } buf += field_size - min_field_size; } *got_frame = 1; return avpkt->size; } static const AVOption frwu_options[] = { {"change_field_order", "Change field order", offsetof(FRWUContext, change_field_order), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM}, {NULL} }; static const AVClass frwu_class = { .class_name = "frwu Decoder", .item_name = av_default_item_name, .option = frwu_options, .version = LIBAVUTIL_VERSION_INT, }; AVCodec ff_frwu_decoder = { .name = "frwu", .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_FRWU, .priv_data_size = sizeof(FRWUContext), .init = decode_init, .decode = decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"), .priv_class = &frwu_class, };