diff options
Diffstat (limited to 'ffmpeg1/libavcodec/frwu.c')
| -rw-r--r-- | ffmpeg1/libavcodec/frwu.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/frwu.c b/ffmpeg1/libavcodec/frwu.c new file mode 100644 index 0000000..b1c7408 --- /dev/null +++ b/ffmpeg1/libavcodec/frwu.c @@ -0,0 +1,128 @@ +/* + * 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, +}; |