1/* 2 * AVRn decoder 3 * Copyright (c) 2012 Michael Niedermayer 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "avcodec.h" 23#include "codec_internal.h" 24#include "internal.h" 25#include "libavutil/imgutils.h" 26 27typedef struct { 28 int interlace; 29 int tff; 30} AVRnContext; 31 32static av_cold int init(AVCodecContext *avctx) 33{ 34 AVRnContext *a = avctx->priv_data; 35 int ret; 36 37 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0) 38 return ret; 39 40 avctx->pix_fmt = AV_PIX_FMT_UYVY422; 41 42 if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) { 43 int ndx = avctx->extradata[4] + 4; 44 a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4); 45 if(a->interlace) { 46 a->tff = avctx->extradata[ndx + 24] == 1; 47 } 48 } 49 50 return 0; 51} 52 53static int decode_frame(AVCodecContext *avctx, AVFrame *p, 54 int *got_frame, AVPacket *avpkt) 55{ 56 AVRnContext *a = avctx->priv_data; 57 const uint8_t *buf = avpkt->data; 58 int buf_size = avpkt->size; 59 int y, ret, true_height; 60 61 true_height = buf_size / (2*avctx->width); 62 63 if(buf_size < 2*avctx->width * avctx->height) { 64 av_log(avctx, AV_LOG_ERROR, "packet too small\n"); 65 return AVERROR_INVALIDDATA; 66 } 67 68 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) 69 return ret; 70 p->pict_type= AV_PICTURE_TYPE_I; 71 p->key_frame= 1; 72 73 if(a->interlace) { 74 buf += (true_height - avctx->height)*avctx->width; 75 for(y = 0; y < avctx->height-1; y+=2) { 76 memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width); 77 memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width); 78 buf += 2*avctx->width; 79 } 80 } else { 81 buf += (true_height - avctx->height)*avctx->width*2; 82 for(y = 0; y < avctx->height; y++) { 83 memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width); 84 buf += 2*avctx->width; 85 } 86 } 87 88 *got_frame = 1; 89 return buf_size; 90} 91 92const FFCodec ff_avrn_decoder = { 93 .p.name = "avrn", 94 .p.long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"), 95 .p.type = AVMEDIA_TYPE_VIDEO, 96 .p.id = AV_CODEC_ID_AVRN, 97 .priv_data_size = sizeof(AVRnContext), 98 .init = init, 99 FF_CODEC_DECODE_CB(decode_frame), 100 .p.capabilities = AV_CODEC_CAP_DR1, 101 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, 102}; 103