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 "libavutil/intreadwrite.h" 26 27static av_cold int decode_init(AVCodecContext *avctx) 28{ 29 if (avctx->width & 1) { 30 av_log(avctx, AV_LOG_ERROR, "FRWU needs even width\n"); 31 return -1; 32 } 33 avctx->pix_fmt = PIX_FMT_UYVY422; 34 35 avctx->coded_frame = avcodec_alloc_frame(); 36 37 return 0; 38} 39 40static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, 41 AVPacket *avpkt) 42{ 43 int field; 44 AVFrame *pic = avctx->coded_frame; 45 const uint8_t *buf = avpkt->data; 46 const uint8_t *buf_end = buf + avpkt->size; 47 48 if (pic->data[0]) 49 avctx->release_buffer(avctx, pic); 50 51 if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) { 52 av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n"); 53 return -1; 54 } 55 if (bytestream_get_le32(&buf) != AV_RL32("FRW1")) { 56 av_log(avctx, AV_LOG_ERROR, "incorrect marker\n"); 57 return -1; 58 } 59 60 pic->reference = 0; 61 if (avctx->get_buffer(avctx, pic) < 0) 62 return -1; 63 64 pic->pict_type = FF_I_TYPE; 65 pic->key_frame = 1; 66 pic->interlaced_frame = 1; 67 pic->top_field_first = 1; 68 69 for (field = 0; field < 2; field++) { 70 int i; 71 int field_h = (avctx->height + !field) >> 1; 72 int field_size, min_field_size = avctx->width * 2 * field_h; 73 uint8_t *dst = pic->data[0]; 74 if (buf_end - buf < 8) 75 return -1; 76 buf += 4; // flags? 0x80 == bottom field maybe? 77 field_size = bytestream_get_le32(&buf); 78 if (field_size < min_field_size) { 79 av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size); 80 return -1; 81 } 82 if (buf_end - buf < field_size) { 83 av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf)); 84 return -1; 85 } 86 if (field) 87 dst += pic->linesize[0]; 88 for (i = 0; i < field_h; i++) { 89 memcpy(dst, buf, avctx->width * 2); 90 buf += avctx->width * 2; 91 dst += pic->linesize[0] << 1; 92 } 93 buf += field_size - min_field_size; 94 } 95 96 *data_size = sizeof(AVFrame); 97 *(AVFrame*)data = *pic; 98 99 return avpkt->size; 100} 101 102static av_cold int decode_close(AVCodecContext *avctx) 103{ 104 AVFrame *pic = avctx->coded_frame; 105 if (pic->data[0]) 106 avctx->release_buffer(avctx, pic); 107 av_freep(&avctx->coded_frame); 108 109 return 0; 110} 111 112AVCodec frwu_decoder = { 113 "FRWU", 114 AVMEDIA_TYPE_VIDEO, 115 CODEC_ID_FRWU, 116 0, 117 decode_init, 118 NULL, 119 decode_close, 120 decode_frame, 121 CODEC_CAP_DR1, 122 .long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"), 123}; 124