4 * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
6 * This file is part of Libav.
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "bytestream.h"
26 static av_cold int decode_init(AVCodecContext *avctx)
28 if (avctx->width & 1) {
29 av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n");
30 return AVERROR(EINVAL);
32 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
34 avctx->coded_frame = avcodec_alloc_frame();
35 if (!avctx->coded_frame)
36 return AVERROR(ENOMEM);
41 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
45 AVFrame *pic = avctx->coded_frame;
46 const uint8_t *buf = avpkt->data;
47 const uint8_t *buf_end = buf + avpkt->size;
50 avctx->release_buffer(avctx, pic);
52 if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) {
53 av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n");
54 return AVERROR_INVALIDDATA;
56 if (bytestream_get_le32(&buf) != MKTAG('F', 'R', 'W', '1')) {
57 av_log(avctx, AV_LOG_ERROR, "incorrect marker\n");
58 return AVERROR_INVALIDDATA;
62 if ((ret = avctx->get_buffer(avctx, pic)) < 0) {
63 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
67 pic->pict_type = AV_PICTURE_TYPE_I;
69 pic->interlaced_frame = 1;
70 pic->top_field_first = 1;
72 for (field = 0; field < 2; field++) {
74 int field_h = (avctx->height + !field) >> 1;
75 int field_size, min_field_size = avctx->width * 2 * field_h;
76 uint8_t *dst = pic->data[0];
77 if (buf_end - buf < 8)
78 return AVERROR_INVALIDDATA;
79 buf += 4; // flags? 0x80 == bottom field maybe?
80 field_size = bytestream_get_le32(&buf);
81 if (field_size < min_field_size) {
82 av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size);
83 return AVERROR_INVALIDDATA;
85 if (buf_end - buf < field_size) {
86 av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf));
87 return AVERROR_INVALIDDATA;
90 dst += pic->linesize[0];
91 for (i = 0; i < field_h; i++) {
92 memcpy(dst, buf, avctx->width * 2);
93 buf += avctx->width * 2;
94 dst += pic->linesize[0] << 1;
96 buf += field_size - min_field_size;
99 *data_size = sizeof(AVFrame);
100 *(AVFrame*)data = *pic;
105 static av_cold int decode_close(AVCodecContext *avctx)
107 AVFrame *pic = avctx->coded_frame;
109 avctx->release_buffer(avctx, pic);
110 av_freep(&avctx->coded_frame);
115 AVCodec ff_frwu_decoder = {
117 .type = AVMEDIA_TYPE_VIDEO,
118 .id = AV_CODEC_ID_FRWU,
120 .close = decode_close,
121 .decode = decode_frame,
122 .capabilities = CODEC_CAP_DR1,
123 .long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"),