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  1. /*
  2.  * Forward Uncompressed
  3.  *
  4.  * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg 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.
  12.  *
  13.  * FFmpeg 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.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include "avcodec.h"
  24. #include "bytestream.h"
  25. #include "internal.h"
  26. #include "libavutil/opt.h"
  27.  
  28. typedef struct {
  29.     AVClass *av_class;
  30.     int change_field_order;
  31. } FRWUContext;
  32.  
  33. static av_cold int decode_init(AVCodecContext *avctx)
  34. {
  35.     if (avctx->width & 1) {
  36.         av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n");
  37.         return AVERROR(EINVAL);
  38.     }
  39.     avctx->pix_fmt = AV_PIX_FMT_UYVY422;
  40.  
  41.     return 0;
  42. }
  43.  
  44. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
  45.                         AVPacket *avpkt)
  46. {
  47.     FRWUContext *s = avctx->priv_data;
  48.     int field, ret;
  49.     AVFrame *pic = data;
  50.     const uint8_t *buf = avpkt->data;
  51.     const uint8_t *buf_end = buf + avpkt->size;
  52.  
  53.     if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) {
  54.         av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n");
  55.         return AVERROR_INVALIDDATA;
  56.     }
  57.     if (bytestream_get_le32(&buf) != MKTAG('F', 'R', 'W', '1')) {
  58.         av_log(avctx, AV_LOG_ERROR, "incorrect marker\n");
  59.         return AVERROR_INVALIDDATA;
  60.     }
  61.  
  62.     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
  63.         return ret;
  64.  
  65.     pic->pict_type = AV_PICTURE_TYPE_I;
  66.     pic->key_frame = 1;
  67.  
  68.     for (field = 0; field < 2; field++) {
  69.         int i;
  70.         int field_h = (avctx->height + !field) >> 1;
  71.         int field_size, min_field_size = avctx->width * 2 * field_h;
  72.         uint8_t *dst = pic->data[0];
  73.         if (buf_end - buf < 8)
  74.             return AVERROR_INVALIDDATA;
  75.         buf += 4; // flags? 0x80 == bottom field maybe?
  76.         field_size = bytestream_get_le32(&buf);
  77.         if (field_size < min_field_size) {
  78.             av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size);
  79.             return AVERROR_INVALIDDATA;
  80.         }
  81.         if (buf_end - buf < field_size) {
  82.             av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf));
  83.             return AVERROR_INVALIDDATA;
  84.         }
  85.         if (field ^ s->change_field_order) {
  86.             dst += pic->linesize[0];
  87.         } else if (s->change_field_order) {
  88.             dst += 2 * pic->linesize[0];
  89.         }
  90.         for (i = 0; i < field_h; i++) {
  91.             if (s->change_field_order && field && i == field_h - 1)
  92.                 dst = pic->data[0];
  93.             memcpy(dst, buf, avctx->width * 2);
  94.             buf += avctx->width * 2;
  95.             dst += pic->linesize[0] << 1;
  96.         }
  97.         buf += field_size - min_field_size;
  98.     }
  99.  
  100.     *got_frame = 1;
  101.  
  102.     return avpkt->size;
  103. }
  104.  
  105. static const AVOption frwu_options[] = {
  106.     {"change_field_order", "Change field order", offsetof(FRWUContext, change_field_order), FF_OPT_TYPE_INT,
  107.      {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM},
  108.     {NULL}
  109. };
  110.  
  111. static const AVClass frwu_class = {
  112.     .class_name = "frwu Decoder",
  113.     .item_name  = av_default_item_name,
  114.     .option     = frwu_options,
  115.     .version    = LIBAVUTIL_VERSION_INT,
  116. };
  117.  
  118. AVCodec ff_frwu_decoder = {
  119.     .name           = "frwu",
  120.     .long_name      = NULL_IF_CONFIG_SMALL("Forward Uncompressed"),
  121.     .type           = AVMEDIA_TYPE_VIDEO,
  122.     .id             = AV_CODEC_ID_FRWU,
  123.     .priv_data_size = sizeof(FRWUContext),
  124.     .init           = decode_init,
  125.     .decode         = decode_frame,
  126.     .capabilities   = CODEC_CAP_DR1,
  127.     .priv_class     = &frwu_class,
  128. };
  129.