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https://github.com/FFmpeg/FFmpeg.git
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a247ac640d
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
129 lines
4.2 KiB
C
129 lines
4.2 KiB
C
/*
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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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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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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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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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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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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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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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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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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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if (field ^ s->change_field_order) {
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dst += pic->linesize[0];
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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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for (i = 0; i < field_h; i++) {
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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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const 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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};
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