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/* |
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* Forward Uncompressed |
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* |
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* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "internal.h" |
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#include "libavutil/opt.h" |
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typedef struct { |
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AVClass *av_class; |
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int change_field_order; |
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} FRWUContext; |
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static av_cold int decode_init(AVCodecContext *avctx) |
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{ |
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✗✓ |
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if (avctx->width & 1) { |
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av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n"); |
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return AVERROR(EINVAL); |
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} |
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avctx->pix_fmt = AV_PIX_FMT_UYVY422; |
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return 0; |
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} |
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
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AVPacket *avpkt) |
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{ |
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FRWUContext *s = avctx->priv_data; |
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int field, ret; |
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AVFrame *pic = data; |
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const uint8_t *buf = avpkt->data; |
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const uint8_t *buf_end = buf + avpkt->size; |
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✗✓ |
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if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) { |
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av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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✗✓ |
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if (bytestream_get_le32(&buf) != MKTAG('F', 'R', 'W', '1')) { |
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av_log(avctx, AV_LOG_ERROR, "incorrect marker\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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✗✓ |
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if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
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return ret; |
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pic->pict_type = AV_PICTURE_TYPE_I; |
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pic->key_frame = 1; |
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✓✓ |
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for (field = 0; field < 2; field++) { |
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int i; |
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int field_h = (avctx->height + !field) >> 1; |
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int field_size, min_field_size = avctx->width * 2 * field_h; |
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uint8_t *dst = pic->data[0]; |
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✗✓ |
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if (buf_end - buf < 8) |
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return AVERROR_INVALIDDATA; |
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buf += 4; // flags? 0x80 == bottom field maybe? |
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field_size = bytestream_get_le32(&buf); |
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✗✓ |
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if (field_size < min_field_size) { |
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av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size); |
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return AVERROR_INVALIDDATA; |
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} |
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✗✓ |
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if (buf_end - buf < field_size) { |
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av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf)); |
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return AVERROR_INVALIDDATA; |
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} |
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✓✓ |
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if (field ^ s->change_field_order) { |
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dst += pic->linesize[0]; |
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✗✓ |
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} else if (s->change_field_order) { |
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dst += 2 * pic->linesize[0]; |
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} |
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✓✓ |
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for (i = 0; i < field_h; i++) { |
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✗✓✗✗
✗✗ |
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if (s->change_field_order && field && i == field_h - 1) |
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dst = pic->data[0]; |
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memcpy(dst, buf, avctx->width * 2); |
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buf += avctx->width * 2; |
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dst += pic->linesize[0] << 1; |
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} |
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buf += field_size - min_field_size; |
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} |
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*got_frame = 1; |
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return avpkt->size; |
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} |
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static const AVOption frwu_options[] = { |
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{"change_field_order", "Change field order", offsetof(FRWUContext, change_field_order), AV_OPT_TYPE_BOOL, |
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{.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM}, |
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{NULL} |
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}; |
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static const AVClass frwu_class = { |
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.class_name = "frwu Decoder", |
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.item_name = av_default_item_name, |
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.option = frwu_options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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AVCodec ff_frwu_decoder = { |
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.name = "frwu", |
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.long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_FRWU, |
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.priv_data_size = sizeof(FRWUContext), |
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.init = decode_init, |
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.decode = decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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.priv_class = &frwu_class, |
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}; |