/* * 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 "libavutil/intreadwrite.h" static av_cold int decode_init(AVCodecContext *avctx) { if (avctx->width & 1) { av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n"); return -1; } avctx->pix_fmt = PIX_FMT_UYVY422; 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 field; AVFrame *pic = avctx->coded_frame; const uint8_t *buf = avpkt->data; const uint8_t *buf_end = buf + avpkt->size; if (pic->data[0]) avctx->release_buffer(avctx, pic); if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) { av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n"); return -1; } if (bytestream_get_le32(&buf) != AV_RL32("FRW1")) { av_log(avctx, AV_LOG_ERROR, "incorrect marker\n"); return -1; } pic->reference = 0; if (avctx->get_buffer(avctx, pic) < 0) return -1; pic->pict_type = AV_PICTURE_TYPE_I; pic->key_frame = 1; pic->interlaced_frame = 1; pic->top_field_first = 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 -1; 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 -1; } 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 -1; } if (field) dst += pic->linesize[0]; for (i = 0; i < field_h; i++) { memcpy(dst, buf, avctx->width * 2); buf += avctx->width * 2; dst += pic->linesize[0] << 1; } buf += field_size - min_field_size; } *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_frwu_decoder = { .name = "frwu", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_FRWU, .init = decode_init, .close = decode_close, .decode = decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"), };