| /* |
| * 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(); |
| |
| 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"), |
| }; |